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Great to point information i was looking for thanks alot. I subscribed and liked channel

No.

I changed the orfice tube in a 2004 ford ranger to a vov tube and had to put in a far amount more freon to get the low pressure up to keep compressor from cycling. Is this normal for the vov orfice tube?

If you had illustrations or even simple animations this would be way easier to understand

@professor did the next fan correct the issue?

Hello professor! Your channel is amazingly insightful full of usable knowledge. Can you recommend a thorough book covering AC operation/theory and troubleshooting? Not that your videos are not sufficient but a written reference is always handy plus I'm an avid reader. I rebuilt automatic and standard transmissions for 28 years. I have now moved in another direction with heavy trucks and equipment diagnosis and repair. I had no previous experience in AC work so I am learning all I can possibly learn. Where your videos shine is your detailed explanations on how a component or system works. If one understands how something works they can essentially troubleshoot any issue. Knowledge is one thing but understanding is everything. Thanks for sharing your immense knowledge and experience. I'm a follower and fan.

Would this cause the A/C to completely now work? I took it to a shop, confirmed the compressor was working and that it had refrigerant. One of the techs looked at the fan and immediately told me to replace the clutch fan first, that it looked weak, he even put his hand on it while it was rotating. Thanks

Would it cause my car to stall when I pull off from red lights?

Thanks. This just confirmed it for me. Customer wanted to do an AC install himself. Charged it and it was blowing 60 on a 105 day. Asked him if he put in an orifice tube and he asked what it was. Thanks

I believe the compressor on my Lincoln mkz is needing to be replaced, how would I diagnose that the compressor is broken?

I like the way he talks. It’s adoribole

I replaced compressor vacuumed everything and went to recharge and now i have a low reading but my high pressure side has no pressure

I have a 96 dodge ram 2500. I think my orifice tube is missing but not sure. The low pressures are high and the high pressures are low. Brand new compressor and condenser. Any suggestions?

Obrigado meu senhor, agora vou refinar petróleo em casa. O governo que se foda👌

My low side pressure goes all the way up to 150+ p.s.i. when the compressor cycles off and then down to around 50 p.s.i. after the clutch kicks in. It cycles every 5 to 10 seconds. System will blow cold air when driving but not at idle.

this is wonderful thank you so much sir

Thank you sir. Great video

Finally thanks for explaining that step for step

Does the capillary tube read temperature or pressure? At time 17:45 you said psi. The relationship between temperature and pressure would depend on the charge level and other factors?

I just replaced my entire heating and cooling system; hoses, belts, heater and evaporator cores, radiator, idler pulley, a/c compressor, etc and it wasn’t cooling right yesterday. Yup; I should have replaced the fan clutch while it while I had it out! Strange how now I realize I’ve never heard the fan engage since I’ve owned this van.

Great to the professor is still educating students. I was a past Student of his in the 90's . At that time I was a Chrysler Tech. Always enjoyed His style of teaching. Thanks !

I was wondering if the expansion valve, Compressor Control valve or the hvac system switch could be causing my line pressure to be high on the low side. Above 660 psi. No leaks. I drained the system down and tried to fill it to 55 psi on 90° day 12% humidity. I let sit over night and checked again but was right back to over pressure. Luckily no burst. I did attempt to drain it again to normal pressure. Leaning to a bad compressor. But wasent sure exactly. And buying the 3 parts to change is about the same as a new compressor. I will test them and see if they are at proper voltage. I did check all fuses and fan is working.. Not sure what to do now. 95° and getting hotter here on the east coast. Not sure how to even check if any of the parts are functiong after I check voltage. Engine does change when I turn on the AC. The idle does come up about 500-600 rpm. Please if someone can help me .

Hey Professor Norman, quick question on static temps and high ambient air in high heat days. I live in El Paso Tx and just purchased a mastercool 89661 pro. My question is what am I supposed to do if the ambient air is 108 and my new gauges on the low side only goes up to 95Deg F at 120 psi and the gauge goes into "retard" on static check because it is so hot ?? I quickly started the vehicle and it came down to 35-40 right away, but I am afraid of breaking my low side gauge that way. Any advice?? Thx in advance. Mark W5YAK

Huge thank you!!! I have multiple cans and never know who put what in them. I don't trust my nose at all so the finger is the best help. I do make labels but everyone in the family needs to use them properly! Thankful for you Prof!

Great videos ! You seem very passionate about your work. I will be starting a a/c tech class soon so i might be asking you a few questions in the next weeks 🙂 If i understand correctly, the refrigerant pressure moves the wobble plate ? So if the wobble plate doesnt want to get more demand (more angle) it might be caused by a low refrigerant level in the system ? thanks !

Ok Scott. How about if you have a case where the fan is roaring at highway speeds or comes and goes with noise

I was working on 2000 ford ranger today and found it was missing the orifice tube. It was sweating/ condensating very badly. I knew there was an issue with orifice tube, but didn't expect it to be missing.

I feel like the disk that has (leaf?)springs on the clutch plate is sitting wider on one end then the other Can I bend it back to a uniform gap around the plate or do I need a new one?

Exactly what I was looking for

I love the videos showing the pressures and duty cycle under different conditions. However, can you please include a video of a variable displacement compressor with a mechanical control valve? I see lots of discussion of the solenoid type and the ability to test the signal/demand, as well as videos on replacing them because of a high failure rate. I have an Altima (R134a) with a Valeo DCS171C variable compressor with a mechanical valve (manual climate control) that works on pressure. I'm having issues with getting good cooling and have above normal low side and below normal high side and suspect the control valve is not functioning properly (last year replaced evaporator, TXV, dryer and pressure switch). With ambient about 84 I had 45L and 150H. The pressures tell me the TXV isn't stuck closed, and it's slow to equalize when shut down so I don't think it's stuck open. The low side pressure takes a minute to begin dropping after turning the AC on. I wonder if the bellows in the valve has ruptured and the valve is in a sort of neutral failed state (maybe a 50% position?), allowing for some compression but not changing based on demand (a low side pressure increase due to heat load at evap.). A video on troubleshooting this type would be great, helping to distinguish between the mechanical valve and other possible sources of trouble.

Thank youuuuu!!!

what speed the blower fan was during this test?

Hi professor Pentane, does this also looks like as a low on refrigerant situation?

I saw old tires distilled into gasoline , it was filtered afterwards and ran in a engine it looked more lihe kerosene to me but it worked . Im looking to make my own fuel for off-grid power generation. Only about 5 gallons per batch. And carbohydrates to ethanol will bring trouble especially at that volume. I thought about methanol. And possibly seeing what is possible from the wood oil (crude oil from wood) see if it can be broken unto thinner more useful fuels. Maybe the distilled rubber mixed with methanol from wood would make a decent fuel. Anything frim 85-95 octane should be ok for my use maybe less i can always mist water or water Methanol/ethanol to help any pre-ignition! And can plastic be broken into a gasoline substitute?

Can motor oil be cracked into a ighter oil? By heating without o2 and possibly under pressure? And what would happen if used oils was placed into a 2" pipe 4"long and sealed up filled 80% and heated to nearly 1000°f i know eventually it will be a bomb. But I'm interested in what happens to the oil? Is it broken into shorter chain molecules? That can then be distilled out ?

I’ve got a v.d. compressor in my 2003 x5. I’m experiencing only 1 to 3 psi change between high and low with the clutch activated. Classic symptom of a bad compressor. Pressure was around 100psi static, and I believe it was 85+* outside. My question: is it possible for this to happen by a stuck open expansion valve, and or a low duty cycle, or stuck solenoid?

Can never find any info on Low side normal/high and High side normal. All the other conditions are easy

Interesting video. I see you but I hear John c Reiley lol

May you please demonstrate how they use Catalytic cracking

What university bruh? I can't make it out in any of your vids..., kinda rattled fast & not enunciating too well.. But thank you for these videos, they are the best I've found anywhere!

Can you tell me do you keep both gages in the open position or closed when testing.. thanks

Where is the orifice tube? Looks like you can place it anywhere in the line. How do you find it in a dealer installed system? My system was vacuumed and I cannot get new refrigerant to go in. The compressor clutch is always on too. I thought it would be off after vacuuming until it gets enough refrigerant in it.

Is the car running with the ac turned on ? Pl clear that before u het into specific details

I let pressure out high side because I didn't have an understanding. So I need to pull vacuum on high side ?

Professor Info regarding 2002 ford ranger with missing orifice tube. Initially taken to Firestone for inop aircon. They replaced leaking evaporator & installed new accumulator/ dryer. Aircon was working but definitely weaker than normal. Returned it to them twice with no help. Decided to get gauges & do it myself. Readings with orifice tube missing were 43 / 125 psi with 55 degree outlet temp , equalization time 5 seconds. After installing orifice tube readings are 33 / 165 psi with 38 degree outlet temp , equalization time 45 seconds. System working great . Regards Lance

This saved the day. Firestone replaced the evaporator & neglected to install orifice tube. Works great after installing orifice & recharging

2011 highlander new compressor expansion valve condenser charged to proper level using robinair machine ac compressor and fans only stay on above 1k rpm

Excellent information. Thanks for sharing!

Are you measuring voltage to the solenoid on the compressor=duty cycle? (ie 4V = 40% duty cycle)

I love your class ❤, thank you ❤️