A/C compressor FREE FIX! Toyota Clutchless type
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- Опубликовано: 28 авг 2024
- The "clutchless" A/C compressor on this 2009 Toyota Corolla had a weird failure where the shaft plate separated from the driven pulley.
Time for a new compressor to the tune of over $1000?
Guess again!
This is PHAD, and our motto is "NO PARTS REQUIRED" ;)
Enjoy!
Ivan
Good to see we still have a real mechanic with us, not just parts changers!!
No hack job here! Just someone who is smart enough to FIX a problem and not throw parts at a situation. JOB WELL DONE!
Trying to save the customer money is a noble effort. Seems like too many shops do the opposite.
Memories of the days when mechanics FIXED cars rather than being a parts replacer. WELL DONE.
It has the compressor running, but it hasn't "fixed" it. This is a cheaper modification that will allow time for a more convenient replacement.
This doesn't fall under the category of parts replacers in my opinion. This is a good idea to keep you going for a while but usually when the compressors fail externally, I often see the compressors fail internally and you think a thousand dollar compressor is bad? Just wait until you send metal debris into the system.
The thing I don't like about repairs like this, is the fact that there are a lot of people that would go and trade it in or sell it to some unknowing person like this and then that person winds up with the catastrophic failure to pay for.
@@acetech9237only 1k repair if you have a shitbag mechanic work on it, so all mechanics.
Back when cars broke down all the time? You mean those days? 😂
You are a brilliant mechanic. I like people trying to fix things rather than just changing everything with new parts
Thank you, as long as I can make it through summer you just saved me $1000
Toyota was asking for it. The pilot holes are already there! Thanks Ivan, us driveway mechanics need to know these things.
Love it, saving the customer money is great, I've heard of shops that do the opposite. Your shop is great :-)
Great fix Ivan I was glad to see you use 4 bolts instead of 2 as it will balance much better with the 4. It will be interesting to track the repair and see how long It will last.
Nothing quite as satisfying as beating the system. Good fix!
This IS oddly satisfying. 😳 nice work Ivan! This is a fix, not a hack lol I don't care what Keith says 😆
🤔😂
Does this mean the compressor working all the time now?
Tony is a clutchless type compressor, with a pressure regulation valve, there's no cycling of a clutch.
@@SuperMarioDiagnostics ,,
It's still working fine a year later 😁
I love that kind of repairs, this is how we show talent. I always try to fix something before go to the shop for new one...even the latch for the toilet cistern when got broken🤣. Still work 2 years later, with a small screw hidden and little of poxipol. The repair is not noticeable
I love it! It's especially satisfying to resurrect a part that Toyota (or BMW, or GM...) has designated "Repairs veel not be permitted!"
I just drilled 4 drywall screws into the plastic and it WORKED! Thank You so friggen much!
It's a neat fix. I'd definitely use it to get through a summer here in AZ. I'd just be worried long-term about the compressor grenading and not being able to stop with an actual breakaway plate.
Thanks for this tip; a great practical and inventive idea with no downside. To speed up the process, consider using cheap wooden shims instead of the claw to get enough room to work and to keep the plate from moving around while you’re drilling holes and positioning the nuts; in addition consider using locking forceps to position the nuts or long needle-nose pliers (with handles applying continuous clamping pressure to the nuts by wrapping the handles with a heavy rubber band, which come free with bunches of Broccoli). To make a lasting repair, glue the nuts to the bolts with Locktite. Depending on how much room you have to work with, 2 slightly longer bolts (or 2 more 10 mm ones) may give a longer working life to the fix. Thanks again for this refreshingly simple hack.
Nice fix Ivan, i had used 3 bolts for better balance and grip though. Anyway 209k miles, most cars don't even lived anymore.
Economically sound repair, thumbs up.
No computers, scanners or scopes. Good old fashioned ingenuity fix!
Hack repairs that actually work = time well spent :D
I think you just gave Dorman an idea for a new "repair kit" product line
Already working on it.
@Dorman Products Ivan's attorney from the law firm of Dewey, Cheetham & Howe will be contacting your attorneys to review all development & work product documentation for possible patent infringement lawsuit. Or you can just cut Ivan a check now, since we all know he created this repair solution.
@@govhickenlooper
/\ This guy /\
LOL
😂
Dorman Products 😂
Ivan,
Considering the age and milage of the vehicle I think that is a 'fair' fix. Thank you for posting.
God bless
Paul
Thank you so much for another GREAT video. I already replaced my Compressor, BUT I learned something for my life. YOU ARE AMAZING bro. God bless
Good job look like mine 2015 Toyota Corolla has same problem
I just replaced a compressor on a 2006 Rav4 - similar issue. There's a 3-point "star" on the compressor shaft that mates with 3 inward-pointing "teeth" on the pulley. The teeth on the pulley had snapped off. Those are there by design as a fuse. If the compressor locks up they snap off and you just loose AC rather than snapping the belt and stranding the vehicle.
Yup the "mechanical fuse" wasn't designed to last very long under normal use lol
VW came up with the right idea on having a replaceable rubber "cogged" piece for some of their cluthless AC compressors. However what I find is that if the rubber cogged piece fails, it usually is due to internal catastrophic damage requiring complete AC compressor replacement anyways.
Most likely be the case here. Hate when they try to reinvent the wheel on a proven design..
Great Job Ivan, it's always an awesome feeling repairing something without spending any money on parts! Keep up the excellent videos, always interesting to watch. Cheers Andy
Thanks for the kind words, Andy!
@@PineHollowAutoDiagnostics Thanks Ivan, any updates for the community?
Genius! I know that Eric is jealous of your talents, Because you are very reluctant to use the "part Cannon" in your repairs.
There is a few concerns about this hack. Where as it works, your compressor will be spinning full time which will cost you in fuel milage even when you are not using AC.
When AC is off that clutch disengages the compressor. This way here its on full time robbing the engine of HP.
Also, im wondering if that clutch assembly that is meant to disengage and engage the AC.. if that ever seizes due to being forced to spin, could cause a whole lot more damage.
Normally when the the pressure is low on refrigerant, it disengages the clutch and stops spinning the clutch to prevent further damage.
Have you tried replacing the AC relay?
Also, when the compressor fails, the engine fan that spins when the AC is on will not spin as well. Unless you jumped the connection to make it spin regardless of compressor failure.
Unless I am missing something, this does not seem safe to me.
The main thing that you're missing is that THERE IS NO CLUTCH 😉
@@PineHollowAutoDiagnostics I know, you hacked the compressor to run full time right?
Another brilliant idea coming to fruition! You are close to a genius,and your way of thinking is surely missed in this day of replace and throw away. Cudo’s to you Ivan
This folks is how the Soviets kept their T34s going against the Tigers.
Thanks for the video. Thanks for the magic word "Clutchless" on my 2009 Toyota Corolla.
I barking on the wrong tree that my Corolla A/C Clutch always turn on.
Thanks a lot for the video I really appreciate it. I’m having the same problem with my mother-in-law’s car right now I’m gonna give this a whirl and see if it works. It’s working for you so I don’t see why it wouldn’t work for me for me. Thanks a lot for the video. This will buy us a little bit of time until we can afford to buy the new compressor. Thanks again have a great day keep up the great videos.
This video is sort of an unnecessary rube Goldberg solution. I know this because I have this exact same compressor on my 2006 scion xB. It is clutchless (which he gets right), and the whole pulley mechanism is only $50. It's literally easier to simply replace the part than go through this hassle.
This is a three part system. The pulley spins. The middle plate is connected to the pulley and connected to the compressor shaft, and the "stone guard" (outer disc with all the holes in it) is connected to the "inner ring" part of the middle plate, which is connected to the compressor shaft. The problem is that the middle plate has broken where the outer ring (connected to the pulley) connects to its inner ring (connected to the compressor shaft) - which it is supposed to do if the compressor locks up so that it doesn't break the belt and you can still drive the car - but apparently can break just after many miles, which mine did after 225k miles. But replacing the whole pulley assembly is a cheap and "permanent" fix and, truth be told, less hassle than this fix.
How to fix properly with $50 part: ruclips.net/video/Hu9fOhZMjhA/видео.html&pp=sAQA
Part on ebay: Search this phrase: 2006 toyota ac compressor pulley
Cool, thanks for the info! That's definitely the right way to do it :)
Hi Robs, I searched on eBay to find a pulley assembly for my 2007 Corolla but I couldn't find one. My Corolla ZRE152 uses a Denso 6SEU14C clutchless compressor. Some eBay sellers offer an electric clutch assembly saying it's suitable for a ZRE152 Corolla but they obviously got it wrong. I'll keep searching but if you know where I can find the right pulley assembly please let me know, James
I had this problem on the OEM compressor after 200k miles, the plate broke off while driving. I replaced the compressor, just to have the same problem happen again while driving not too long after the job. It's likely something else on the car (other pullies, etc., that are causing the issue, so unless you fix those or apply this type of "fix," you risk having the same problem on your brand new compressor, like me.
Thanks for this video. Im weighing my options here. I can buy a new clutch kit from Ebay for about $100 but need the special tool to remove which is about another $70. Still beats paying over $400 for a new compressor.
the toyota dealer they will hate you very nice job
Yes😂
I will have to try this once mine finally goes out. It's still good for now at 205,000 miles.
These compressors are hard to find parts for. I found the plate and pulley assembly on eBay for 50 bucks. And it work great! And saved 900 dollars! I could fine no info on changing it but when I got the new one it was not to hard to figure out.
Great idea, but with the room available with the tire off I'd personally feel better after drilling the pilot holes for the bolt clearance. I'd personally hand tap a few of the holes and employ lock washer from the front side and not have to deal with the nuts on the back at all.
I cannot argue with results. But I will add $1000 compressors to the long list of reasons why I'll never own a Toyota. Very creative, Ivan!
It is not just Toyota that is going to clutchless AC compressors. They are being used by many different vehicle manufacturers now.
I haven't seen any on domestics, I know for sure my ecoboost focus is normal clutch type, as well as the multiair jeeps.
Jack S Per a major AC component manufacturer's website -- "With the continuing effort to improve fuel economy and reduce emissions, many manufacturers are now using Electronic Control Variable Displacement (ECV) compressors. This design is gradually becoming standard on many vehicles. BMW, Chrysler, General Motors, Hyundai, Jaguar, Kia, Land Rover, Mercedes Benz, Nissan Infiniti, Subaru, Toyota/Lexus, VW/Audi/Porsche are now using it on different models."
i know for a fact they are used on some Cadillac and Chrysler models, because I have had to replace clutchless AC compressors on some of those models. I do not have access to my notes right now, but will look when I get into work tomorrow for exact domestic models using the cluthless AC compressor.
good to know, i guess I have a really small sample size. I can appreciate why they use them, id love to see the list just for future reference.
Ford just hasn't caught up yet.
Not all components are designed and manufactured to perfection and your repair Ivan is an improvement on the original.
Elegant solution, simple, effective, and if it lasted a month, probably will last until the compressor wears out.
One question: why wasn't it designed and built that way?
My guess would be planned obsolescence, job security, and an efficient way to separate more money from the customer. Anyway, way to go!!!
Sometimes things happen for a reason. The compressor may be on the verge of failure, this could throw the belt stranding the vehicle and or contaminating the whole AC system. Now you have to buy the compressor and what ever else it takes to get the car back on the road. OR it could be toyota trying to screw the customer.
Anyway thanks for videos Ivan !
Nice idea. Did the repair hold up? Also, what would happen in an event of the compressor seizing ? I believe that's a safety device where in if seized it disconnects the pulley from the shaft.
Hi Shane, I think that would be the disadvantage of Ivan's fix. You risk the fan belt breaking and coming off. From my research, I think you are right. There is an aluminium circlip that keeps the outer plate which drives the axle/shaft connected to the pulley driven by the fan belt. The circlip is fragile and collapses when the shaft siezes and that disconnects the axle/shaft from the pulley driven by the fan belt. If the circlip breaks because of age and not due to compressor axle/shaft seizing then Ivan's fix will work as long as the compressor doesn't seize. Apart from a new compressor, I think the cheaper fix may be replacing the pulley section if you can find one on eBay.
I totally agree. I tried this fix on my ac compressor and noticed that my compressor was seizing up and instead of a breakaway it killed the engine. I do not recommend this fix at all.
how can we find out whether it's the compressor seize or not ?@@jim2611
Good shit MacGyver!👌👍👍
I have one with the same issue caused by a belt damage when the water pump failed. I'm going to try it with a twist, I'm going to Helicoil the plastic pullet and Loctite the bolt as well as tack welding them. Since just the compressor is around a grand what can lose. I will let you know how it goes.
Ivan loves his free fixes or at least no parts needed. Lol This is great Ivan, thanks!
Did you see that? i can't believe that worked? Ivan is an amazing mechanic and engineer too cuba.
any new videos coming
good hack. but if the compressor seizes you can say goodbye to the belt. clutchless ac compressors have rubber shear connections and are designed to snap if the compressor fails.
I call folks hacks when they try & butcher the job. Ivan, you have modified/reengineered the operation of a broken component to keep the unit running until the proper budget/part is acquired. This is maximizing usability not hacking! 🙌🙌🙌🙌🙌😂😄😁
There is a fine line between "maximizing usability" and "hacking" hahaha
Please Beware!! Neat idea in a pinch but realize why these are designed to separate. If a compressor experiences too much load from internal failure or lockup, it is deigned to break away so the compressor pulley can still spin and you will still have your belt, power steering, water pump, alternator etc functioning. Beware if you do this and the compressor locks up from an internal failure then the pulley can seize and shred the belt and now not only do you not have a/c but now you have no other accessories and if the water pump is not turning you can overheat the engine. Anyways neat idea.
Great point... Neat idea but the real fix is to replace whole compressor it's 556 CAD not bad at all. This repair my cost you thousands if thinks go sideways.
Not a hack. With a part that expensive anything is worth a shot
Great Job!. You might get crap from friends and fans. But there will be a lot of people wanting to do this as an alternative for a customer that just can't afford a compressor. Oh and the coast of the labor, evacuation and recharge!! let's not forget about that :) So yeah probably close too or well over $1000 bucks.And it gives the Customer a little more time.
Awesome! you are a Mc Giver in real
Thanks very much for making the
recipe available.My best regards.
Lovely! That is basically what we do in my country with most of the alternators, Starters, hidraulic steering pumps, AC compresors, Fan clutches among others, of course sometimes hacking but most of the time we just rebuild this things with original parts. We try to fix them if they are unfixable then we buy used ones and in some fewer cases new ones. (Dominican Republic)
Seems like a good choice on a 20-year-old car where the failure was from age more than a mechanical problem. Definitely worth a try.
Bro the car is a 2009, the video uploaded in 2018
How did you come up with 20yrs
Love seeing the notification that Ivans posted a new video! Always informative and entertaining! Thanks Ivan!
Thanks for the comment, Chuck :)
Soooo why was it broken? Why did the break plate let go? Was it an overtemp condition caused by an improperly oiled compressor?
Oh and to clarify. Not 1,000 bucks . Expensive maybe. But might also be the price if a seized compressor leaving someone stranded on the highway shop.advanceautoparts.com/p/denso-new-compressor-with-clutch-471-1632/10110670-P?navigationPath=L1*14922%7CL2*15015%7CL3*15824 😁
Yeah, there has to be a reason why it happened.
New Level Auto True , didn’t think of this a tech. I just saw the repair and didn’t even bother asking why.
you could use plastic bolts and nuts so if the compressor did fail they would just shear off no drama
Not a $1000 but I bet with the additional cost of swapping the compressor much closer to a Kilo buck.
Keith is correct. You didn’t fix the cause of the failure. You’re correct “Hack Fixes - that work - are more satisfying”. Extra Butter with Extra Salt. Is it Correct or is it Satisfying? I Like It! Thanks for sharing.
hank you for the video doing this, the compressor will work all the time, never stops, is there no risk of wearing out the compressor?
It works what more can you say. Just hope no one "fixes" their compressor like this an pawns it off on some unsuspecting person.
Thanks a million!!!! I have an 06 Audi A4 with same issue, I will definitely try before replacing compressor.
My car has the same issue! Gonna give this a try instead of a $500 to $1000 repair!!
Thank You for this video. Now I know my 2011 scion xD 1.8 liter also clutchless. Ac works well after adding cooler to it , but thinking I have to replacement the clutch cuz it won’t stop spinning, I’m stress free now.
Thank You Soo Much!!
You connect the plate to the pulley, this way I think the compressor will run contiguously. am I right?
Wonder if some self tapping screws would achieve the same results?
Hi Ivan, I realise your video was a few years ago but it impressed me. I hope you can help me. In Sydney, Australia I have a 2007 Corolla which looks exactly like yours. The compressor looks the same (Denso 6SEU14C). I understand these are clutchless and the outer cover plate (stone guard?) always spins when the engine is on via the fan belt - is that right? Continuous compression of refrigerant gas is protected by a high-pressure release valve. The pulley system of the compressor has a sacrificial circlip that breaks when the compressor shaft/axle seizes. This is to prevent breaking the fan belt. When the pulley system circlip breaks the outside cover plate no longer turns with the compressor shaft/axle. I also understand that these sacrificial circlips can break spontaneously after high mileage. If the outer cover plate is disconnected because the circlip spontaneously broke then a new pulley kit can fix it. However, I like your fix because it may be hard to get a pulley kit - I searched on ebay but all I could find for my Corolla was an electric clutch kit - the ebay seller has his cars mixed up. Someone else asked the question but I couldn't find your answer - could self tapping bolts be used - ie not fixed with nuts? regards, James
*@Pine Hollow Auto Diagnostics*
BOOM! It's Krown Time! ; )
Hey Ivan - just got thinking about your video on the *Ford BLIS blind spot Warning: Diag & Repair.*
The trailer connector plug on our 1 vehicle is a real pain to open, so sometimes i wonder if it gets sprayed.
But it had a little green corrosion on it, and i didn't know where to get DeOxit or anything like it in Canada.
But i went to my local Krown location to stock up on the good stuff and i mentioned my plug issues and they
said use Krown 93 Parts & Brake Cleaner ( leaves no residue & is an electrical contact cleaner ).
-So i thought i'll re-watch Ivans video 1 more time , and then that led me to watch a few more trailer plug cleaning videos.
I took white vinegar in a cup, put the trailer plug in there for like 3 hours. Came back to check on it & no green crust,
used the Krown 93 Electrical Cleaner www.krownindustrial.com/products.php?product=ke93
, and then Used compressed Air to dry the plug out, then i took a different step to what you did ....but same idea in terms of protecting the plug......except i used the Krown T40 in the plug and on the connectors.
- So i'll have to make sure i spray it every year now, i had always just sprayed the outside of the plastic plug being lazy and foolishly thought ....meh it'll be good. Not so.
Your old video helped me out. I checked the plug in the spring & thought of your video then....just finally got around to fixing it.
PS .... some farmers almanacs are saying we are gonna have a crazy winter for snow....some say not. But make sure whatever your snow machine is , that it's good and ready by the end of October. Oh yes....don't forget to Krown the Mystique. :) Eric has to spray the Tundra this year still.
Hey Ivan !! Great job ! Looks good from here . I would do this for my customer if they could not afford a new compressor at the time . We only have about a month or 2 of AC weather. Here in Philadelphia pa. :( some of my customers don't like spending money at all so this will work great for them !!! You the man Ivan !! Thank you
Hi, do you do car repair in Philly? I have an 06 Scion xB (clutchless compressor) and no cold air. I could use your help :)
Hey I'm in the Philly area and have the same car with the same problem. Do you still fix cars?
I don't know why they change systems that work great. My 05 corolla has 310,000 and still have the original compressor. Also had an 09 until it was totaled. Never realized it had that style of compressor.
Great fix Ivan always look forward to them,I figured Keith or Eric O would be all over it.It does does give the option to fix or temporary fix
Thank you this idea save me $$$$ worked on my 2013 Corolla
Excellent, beats the s*** outta part's and labor for a compressor that's not failed
Amazing job ! What do you think about almost the same compressor which got stuck ? Is it possible to repair ?
Subscribed and liked- customers lucky to find a mechanic like you
Welcome to the channel! 🙂
Hi Ivan I know this is an old Video but I'm trying to sort my 2013 Toyota AurisCorolla,s AC the bit that's puzzling me is why the Compressor turns all the time I thought it should only turn when the Coil on the clutch energises. My Compressor doesn't look the same as this but do you think the front of the pully should always turn on my Toyota??
I'd have done the same thing Ivan - $460 plus tax at Advance Auto- no thanks!
Great idea Ivan!😎👍
It's funny you mention Keith. I see that he made a comment already. But hey, if you can save the customer some money and teach us DIY'ers a trick then I say well done.
They are shear tabs so if the compressor freezes up you won't fry your belt , kind of like Ford's electric window motor had a plastic ball in the actuator that you could drop in a 1/4 -20 nut in but if you rolled the window up obstructed ,look out, no stoping it😆. I would use aluminum pop rivets , they might shear off if the compressor freezes . Good Job though
Awesome bud I have a 2010 camry I've been wondering Why it always spins never stops no clutch right
If i did something like that it would break and leave the customer stranded in a blizzard with no help in sight. Ingenious repair though.
Another Rube Goldberg repair as we use to say. Nice easy fix Ivan. Toyota is not going to like you but who cares. 1000$+ for a part is insane. 👍
Ivan, you are very innovative! Good fix!
I would love to hear what Eric O would say about this awesome fix. LOL. Great job.
I am very impressed with your brilliance
decades ago,Volvo among others,used slip clutches on fan blades to save
wee bit of engine power, these parts were NON user replaceable
-but I just spot welded across slip clutch-then they ran FOREVER
FIXED fan by welding slip clutch-so LOST about 1/4 H/P FOREVER ~~
-but gained 400 THOUSAND extra miles on car in Canada
including 7 trips back and forth to California and Arizona
however I had to later replace Volvo water pump,
(a known weak spot in Volvos) -in state roadside "rest"
-using all 4 Volvo SS wheel covers to retain antifreeze-for reuse
Awesome hack ivan, i love your fixes like this!!
You take things apart and see where they fail!
More vids like this please!!!
Sure!
Hey Hack!🤣 That pulley is called a break plate, it's designed to come apart if something is wrong with the compressor.😜
Just bullying you buddy, it's worth trying i get it.😘
Love your video's Ivan !👍
I was just thinkin there is more to that "clutchless" thing.
Variable vane type?
Is that how the output is controlled? Its the only thing i can think of.
GM used a variable displacement compressor in the late 80's and 90's that was a piston type that had a swash plate that changed angle as the car cooled down, it still had a electro clutch it just didn't cycle it would vary the refrigerant flow to maintain output.
also I looked it up, shiny new denso compressor for a 09 Toyota corolla $494usd
@@middlecovemotors2474 Next month i release a video i made a few weeks ago. In that video i diagnose a Ford with a variable Ac compressor. In that video i explain how the compressor works😉
@@Diagnosedan We don't see many of those variable vane/output type Down Under, only on hybrids so far.
Possibly too poxy (not good enough)for our climate.
So the breakaway pulley came away for a reason.............check the refrigeratent and pressures maybe?
@@middlecovemotors2474 Hard to tell, Maybe the part just failed. Time will tell. Ivan can keep us updated.
The worst thing that can happen is that the belt comes off. Ivan knows this and that's why he gave this fix a try.😉
This actually what a mechanic is supposed to do :
Repair.
No money in it and a lot of responsibility if something happens.
Excellent. Definitely, "why not"! Good job Ivan. Thanks!
Awesome fix Ivan!
Awesome repair, maybe in the future instead of nuts just tap a thread into the pulley holes and lock tight them and grind down the bolt ends so they will shear off in case the compressor decides to grenade.
Not a hack when you fix it! Nice job Ivan :)
Brilliant idea Ivan.I love these free fixes.
YES!! A true mechanic
Creative, but my prediction is that the bolts are going to machine a circular groove into the plastic pulley.
Good cheap fix fella, better than mega bucks for a pump.
#1 engineer on you tube. way to go Ivan. how much are those compressors by the way? Oh Yeah , is keith an engineer?
That depends 😉🤓. No one ever asked where Ivan and I really met. So back at MIT ....
New Level Auto that explains alot!
The nut is just to hold the bolt secure. Would a self-tapping bolt with a lock washer do the trick?
Well done, cracking repair, old school mechanics, no parts required, :-}
Honest machanic. How many people would charge for a new one. Well done mate.
They do it to try and cover themselves up in case it goes off and plainly seizes later on. Though a lot of mechanics are simply put idiots when it comes to fitting a new compressor and as such it may still backfire on them this way.
Any idea of "the cause" of the issue? I had the plate come off my 15 year old OEM compressor, went ahead and bought and installed a new one. The plate fell off the replacement unit as well within a week or so, seems like something with the car is causing it, but what? Either way going to try your fix, the plate on the new compressor is sitting on the splash guard...
Oz looks like Ivan. good job Ivan I mean Oz
Think I would try some kind of plastic bolt to shear off when that pump met it's maker. If the screws were screwed into plastic, that might do something similar. Maybe the screws would pull out. Anyway we had several gm cars that had the sensor bypass and the tech would tell Grandma to never turn off the AC button. Even when the heat is being used. So she kept the blend knob halfway with the AC on and blower going always.