I wish I had known to do this when I changed out my alternator. It was right there. But it is not as problem yet. My problem was my upper hose on the rad reservoir has a baffle in it and was plugged .it fix my issues imidiately
I have a problem on my 2011 Audi a4b8 143hp multitronic caga when I'm sitting with the heating on car stop to heat and after i start driving its start heating (blow hot air )inside ( changed the inside heater )
@@PetesWorkshop So it was changed last Monday - about 7 days ago now. I have observed that it took at 5°C ambient temp roughly 10 minutes for the water to start rising in temperature, being on par with engine oil temp according to the MFA. Now after the repair, the engine temperatur does start climbing faster, around 3-5min of driving. However, I still have the occasional drop in temperature when standing still or driving in the city. I suspect that both my DSG thermostat and my normal main thermostat were not working correctly, however, the workshop refuses to change the main thermostat since its a lot of work. Too bad the fault only appeared now and not in August when I had the car in for the DSG oil flush and change. For the Tiguan you have to remove a lot of parts, VW themselves advice 4 hours for that job, which you would also have to do if you flush the DSG (which was 700 euro). Bad luck I guess. Looks like I will have to live with it and observe how the car behaves in the foreseeable future before we commit to doing this job.
I have a manual 2L Passat TDI, my coolant gauge struggles to hit 90, and when it does hit 90 it goes back down to 70/80… I never have a problem with hot air coming into my interior tho🫤could anybody recommend is it worth trying the easier fix or does it sound like I need to change the more expensive thermostat? Can somebody help because it’s really bugging me🤯
I have this same problem but im confused because at the end of the video you said you changed the thermostat and it didnt make a difference? Whats the part called that you actually changed? I rawatched the video and it and like there's two thermostats? One is for the engine coolant and another one is the main thermostat?
On the left of the thumbnail is the main thermostat that bolts to the engine block. The small ‘in-line’ thermostat on the right side of the thumbnail was the cause of the problem. This is the DSG thermostat.
hi I have a 2.0 tdi cr manual gearbox I also have the problem of the temperature going down I changed the thermostat twice and I would like to know if it is normal for them to go down to 75° and to go up to 90 ° and I have heating and when cold it takes me 20 minutes for it to reach 90° with an outside temperature of 3° thank you for reply
This does not sound like normal operation. Try to find the cooling system diagram for your car and find a possible reason for coolant to bypass the main thermostat.
You can save a lot of labour in the DSG thermostat job by just swapping the copper/wax module. No need to unclamp any hoses etc. Good idea to still check the actual temps you are reaching though as you kight be just above 75C, not the 88C+ it needs to be at.
Hmm I do not agree. If you separate the thermostat it is difficult to get back together again because of the spring tension. Also you risk damage to the sealing O ring, then you may get a coolant leak. Much much easier to remove 2 hose clamps and replace the complete unit. Less risk in my opinion. Can you even purchase the internal parts without the housing?
@@PetesWorkshop I've done quite a lot of these. The main reason I use this method is that often the thermostat is stuck hard to the rubber pipes and while manipulating it to separate them a few times I've had the plastic elbow break where the rubber pipe joins near the front of the engine. It seems at the age of these vehicles the plastic is getting brittle. By not removing the whole thermostat it lessens the chance of that. No, you can't buy the internals indivisually - I just take the new one apart and remove the capsule. Never had a leak. But either methodis fine, whatever works for you.
Yea I got manual 2.0tdi Passat and temperature is up and down all the time between 70C-85C. Sometimes reaching 90C I just noticed in the winter never seen this in the summer months
I have had a coolant temp sensor fault and it did not present itself the same as this at all. Sensor failure usually appears as non linear movement of the gauge that does not make sense for normal coolant heating/cooling.
Good day dear, I have a similar issue, in the morning on the highway the temperature drops down and error code came - cooling liquid too low. I have Audi TT MK2. Please advise if I can install the same small thermostat as a second one. Thank you!
I have a mk2 TT with 6 speed manual transmission. It does not have the same thermostat. The Stronic (dsg) may do, I don’t know. ‘Cooling liquid too low’. If the reservoir is full you probably have a sensor fault.
Hey just wondering if anybody knows if a 2006 jetta tdi also have the dsg thermostat? Because my car seems to have the same problem with the temperature, and I replace the engine thermostat already but it didn't make a difference.
@PetesWorkshop OK yes I checked it and it does not have that one it only has the engine thermostat, now I'm still trying to figure out what the problem is why my temperature does not go up when I have it idling, if anyone have any idea what that problem could be, if they would want to share it that would be great. Thanks
I have same issuie temp goes up to u0nand stays there unless i out my foot down and already changed thermostat, where did you order this thermostat from and would it work on 2l tdi audi a5 2010 , wngine code is caha
Please, can you tell me what multimedia is in Passat? I have same car, and want to replace rns510, but want to keep MFD function, as your car. Thnx in advance!
@@PetesWorkshop many thanks! I can see, from your video, that MFI (MFD) is integrated with this android media. It's show compas, as it would with the original media (rns510). Other android are not capable of such a thing, as far as i know...
Had the same problem on an audi a4 b8, changed the small one, temp does raise and stay at 90 but raises slow. Drops at +5C and lower if i drive downhill for 5 minutes with cabin temp at 21C Are there 2 or 3 thermostats in the 2009 model?
Mine was an B8.5 audi, changed both thermostats, EGR Cooler, Coolant, did coolant system with Headgasket check, waterpump with timing belt, Coolant Cap (there is a valve too) and both sensors to no avail, still not getting above 75°C
This is true. ‘Operating Temp’ is a temperature range. The gauge on the dash is designed to make it easy for everyday humans (that may not understand the inner workings of a complete engine assembly). I’m ok with this approach by VW.
@@PetesWorkshop Agreed, although the engineer in me does get rather annoyed by a gauge marked with numbers that has little relevance to the actual temperature! Just have a cold/normal/hot range!
I have changed both main and the smaller thermostat and it still drops low when im idling or just waiting for the traffic lights. Any tips? Audi a6 c7 2012 tdi 2.0
I've had the same issue on both my A4s (B7 & B8.5). When in Drive, the temp goes up to 90C, when in S, temp goes down. And as it so happens, today the temp gauge didnt even reach 70C... while yesterday it reached 90C easy. I guess it's fluctuating. A bit unnerving, but nothing to worry about.
@@paulclaeys7631 ye it stays at 90 when I'm on highway and when there is slight downhill and I let of the gas pedal so just coasting it drops after a minute to 70/80, in the winter it even dropped to 50 after like 5 minute downhill only.
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We replaced the expensive one thinking that was the problem but seeing your video may well solve the problem. thank you for this
Well we repalced the small thermostat today and we now have a warm car so thankyou so much for this
I wish I had known to do this when I changed out my alternator. It was right there. But it is not as problem yet. My problem was my upper hose on the rad reservoir has a baffle in it and was plugged .it fix my issues imidiately
I have a problem on my 2011 Audi a4b8 143hp multitronic caga when I'm sitting with the heating on car stop to heat and after i start driving its start heating (blow hot air )inside ( changed the inside heater )
I have a 2013 Tiguan 2.0 TDI 4Motion and have this exact problem. I will have the DSG thermostat replaced next week hoping that it fixes it.
@@stubbi Great. Please come back and let us know.
Can u send me the link of the DSG thermostat
@@gang-gang8325 put this part number into Google search 1K0121113A
@@PetesWorkshop So it was changed last Monday - about 7 days ago now. I have observed that it took at 5°C ambient temp roughly 10 minutes for the water to start rising in temperature, being on par with engine oil temp according to the MFA.
Now after the repair, the engine temperatur does start climbing faster, around 3-5min of driving. However, I still have the occasional drop in temperature when standing still or driving in the city. I suspect that both my DSG thermostat and my normal main thermostat were not working correctly, however, the workshop refuses to change the main thermostat since its a lot of work.
Too bad the fault only appeared now and not in August when I had the car in for the DSG oil flush and change. For the Tiguan you have to remove a lot of parts, VW themselves advice 4 hours for that job, which you would also have to do if you flush the DSG (which was 700 euro). Bad luck I guess.
Looks like I will have to live with it and observe how the car behaves in the foreseeable future before we commit to doing this job.
I have a manual 2L Passat TDI, my coolant gauge struggles to hit 90, and when it does hit 90 it goes back down to 70/80… I never have a problem with hot air coming into my interior tho🫤could anybody recommend is it worth trying the easier fix or does it sound like I need to change the more expensive thermostat? Can somebody help because it’s really bugging me🤯
I have this same problem but im confused because at the end of the video you said you changed the thermostat and it didnt make a difference? Whats the part called that you actually changed?
I rawatched the video and it and like there's two thermostats? One is for the engine coolant and another one is the main thermostat?
On the left of the thumbnail is the main thermostat that bolts to the engine block. The small ‘in-line’ thermostat on the right side of the thumbnail was the cause of the problem. This is the DSG thermostat.
@@PetesWorkshop i asked chatgpt, both thermostat work independantly no ?
@@PetesWorkshopwhat’s the DSG thermostat mechanic name ? Can’t find it online
Do you have a manual or DSG auto gearbox
@@martiipeacock4698 DSG
hi I have a 2.0 tdi cr manual gearbox I also have the problem of the temperature going down I changed the thermostat twice and I would like to know if it is normal for them to go down to 75° and to go up to 90 ° and I have heating and when cold it takes me 20 minutes for it to reach 90° with an outside temperature of 3°
thank you for reply
This does not sound like normal operation. Try to find the cooling system diagram for your car and find a possible reason for coolant to bypass the main thermostat.
Does my audi a6c7 2012 multitronic have this smaller termostat?
You can save a lot of labour in the DSG thermostat job by just swapping the copper/wax module. No need to unclamp any hoses etc. Good idea to still check the actual temps you are reaching though as you kight be just above 75C, not the 88C+ it needs to be at.
Hmm I do not agree. If you separate the thermostat it is difficult to get back together again because of the spring tension. Also you risk damage to the sealing O ring, then you may get a coolant leak. Much much easier to remove 2 hose clamps and replace the complete unit. Less risk in my opinion. Can you even purchase the internal parts without the housing?
@@PetesWorkshop I've done quite a lot of these. The main reason I use this method is that often the thermostat is stuck hard to the rubber pipes and while manipulating it to separate them a few times I've had the plastic elbow break where the rubber pipe joins near the front of the engine. It seems at the age of these vehicles the plastic is getting brittle. By not removing the whole thermostat it lessens the chance of that. No, you can't buy the internals indivisually - I just take the new one apart and remove the capsule. Never had a leak. But either methodis fine, whatever works for you.
i have exactly the same problem on my 2011 cc 2.0tdi 4motion…what do you think, is it the same thermostat or?
Very highly likely it is the same thermostat causing the problem.
My passat is exactly the same after a new thermostat. Ah yours is the auto whereas mine is the manual so doesn’t have that secondary thermostat
Yea I got manual 2.0tdi Passat and temperature is up and down all the time between 70C-85C. Sometimes reaching 90C
I just noticed in the winter never seen this in the summer months
Mine is an Audi 2.0 tdi manual gearbox and it has the second thermostat. Some people call it EGR thermostat.
Manuals do have that secondary termostat. Check the hoses that go into the EGR cooler.
w samochodzie zskrzynia manualną również znajduje się ten termostat , tak jak i zawór dławi,ący
I’ve got the same issue on a golf, I feel like my mpg is suffering as a consequence did you notice that?
This is possible because when the engine is cold (or the ecu thinks it’s cold) the ecu adds more fuel to help it run better.
Coolant temp sensor is also a known cause for those symptoms.
I have had a coolant temp sensor fault and it did not present itself the same as this at all. Sensor failure usually appears as non linear movement of the gauge that does not make sense for normal coolant heating/cooling.
Good day dear, I have a similar issue, in the morning on the highway the temperature drops down and error code came - cooling liquid too low. I have Audi TT MK2. Please advise if I can install the same small thermostat as a second one. Thank you!
I have a mk2 TT with 6 speed manual transmission. It does not have the same thermostat. The Stronic (dsg) may do, I don’t know. ‘Cooling liquid too low’. If the reservoir is full you probably have a sensor fault.
Hey just wondering if anybody knows if a 2006 jetta tdi also have the dsg thermostat? Because my car seems to have the same problem with the temperature, and I replace the engine thermostat already but it didn't make a difference.
@@cornywall6682 have a look around the engine bay hoses for that plastic in-line unit. Most likely it does have one. Please come back and let us know.
@PetesWorkshop OK yes I checked it and it does not have that one it only has the engine thermostat, now I'm still trying to figure out what the problem is why my temperature does not go up when I have it idling, if anyone have any idea what that problem could be, if they would want to share it that would be great. Thanks
Check the ECT sensor...I’ve experienced a bunch of those failures
@808vws8 okay I'll do that yet then I'll let you know, thanks
hello, the same problem passat b8 2015 manual I'm not sure if this car has such a thermostat?
I’m not sure either. Most likely it does though.
does a5 2009 2.0tdi have this one? or only main one?
@@2_S1MPLE if the A5 has a DSG transmission, it will most likely have the additional thermostat. Although I don’t know for sure.
I have the exact same issues with my dolf gtd
I have same issuie temp goes up to u0nand stays there unless i out my foot down and already changed thermostat, where did you order this thermostat from and would it work on 2l tdi audi a5 2010 , wngine code is caha
The part number is in the description. Search it in eBay. I don’t know if the A5 has the same thermostat.
tak , to ten sam termostat , polecam zamówić mahle th 5 80 , który otwiera się przy 80 stopniach.
Please, can you tell me what multimedia is in Passat?
I have same car, and want to replace rns510, but want to keep MFD function, as your car. Thnx in advance!
@@radulepg the head unit is an Eonon brand.
@@PetesWorkshop many thanks!
I can see, from your video, that MFI (MFD) is integrated with this android media. It's show compas, as it would with the original media (rns510).
Other android are not capable of such a thing, as far as i know...
Had the same problem on an audi a4 b8, changed the small one, temp does raise and stay at 90 but raises slow.
Drops at +5C and lower if i drive downhill for 5 minutes with cabin temp at 21C
Are there 2 or 3 thermostats in the 2009 model?
2 thermostats.
@florinmisu the car is currently at the mechanic and he will change the main, the small one was replaced maybe 6 months ago
I have changed the water pump, thermostat and the sensor, unfortunately nothing has been changed.
i am getting crazy
Mine was an B8.5 audi, changed both thermostats, EGR Cooler, Coolant, did coolant system with Headgasket check, waterpump with timing belt, Coolant Cap (there is a valve too) and both sensors to no avail, still not getting above 75°C
75C on the gauge is more like 65C actual. The gauge reads 90C from 75C to 105C.
This is true. ‘Operating Temp’ is a temperature range. The gauge on the dash is designed to make it easy for everyday humans (that may not understand the inner workings of a complete engine assembly). I’m ok with this approach by VW.
@@PetesWorkshop Agreed, although the engineer in me does get rather annoyed by a gauge marked with numbers that has little relevance to the actual temperature! Just have a cold/normal/hot range!
I have changed both main and the smaller thermostat and it still drops low when im idling or just waiting for the traffic lights. Any tips? Audi a6 c7 2012 tdi 2.0
If you have replaced both thermostats the only culprit left would be the temperature sensor...cheap easy fix if it is...
I've had the same issue on both my A4s (B7 & B8.5). When in Drive, the temp goes up to 90C, when in S, temp goes down. And as it so happens, today the temp gauge didnt even reach 70C... while yesterday it reached 90C easy. I guess it's fluctuating. A bit unnerving, but nothing to worry about.
@@paulclaeys7631 I mean in the summer it's ok, but in the winter it's always drops when I let go of the gas pedal
@@Kiko6Kiko ok, that shuts me up. Never had such an issue before...
@@paulclaeys7631 ye it stays at 90 when I'm on highway and when there is slight downhill and I let of the gas pedal so just coasting it drops after a minute to 70/80, in the winter it even dropped to 50 after like 5 minute downhill only.
Exact same problem on my wifes audi tt tdi. Ill need to get it changed
water pump flange could be stuck open.
What is the ‘water pump flange’? More information please.
Just put a new thermostat and still have this issue…
@@sabinislami8884 which thermostat did you replace?
@@PetesWorkshop the big one
Heater on high should always drop the temp. This isn’t unusual.
I agree.
On the engines with one thermostat there is no solution.
2.0tdi posiadają 2 termostaty oraz zawór , nie ma różnicy czy auto z skrzynią manualn, czy automatyczna