A4 b8 2.0tdi 105kW problem with coolant temperature

[Audidua]

Last year my temp gauge started to go down when driving especially when it is cold weather so I replaced thermostat with OEM 03L 121 113 A. After replacement nothing much changed but I did not pay attention because heating was good and fuel consumption also. Two weeks a go I changed coolant temperature sensor with OEM part just because I got it for bargain 8€ or so but nothing changed with coolant temperature. Connected my vcds and found no errors on engine and HVAC module. Coolant temperature readings are the same as gauge is showing on instrument cluster. After all of that I purchased aftermarket thermostat brand Febi Bilstein with opening temperature on 83 degrees celsius but situation got worse. My car is not heating like it was before with OEM thermostat and the temperature goes to 70-80 degrees na and if I stop on traffic lights it immediately goes down. The same thing happens if I drive slowly. I tried to raise rpm on idle to 3500rpm and hold it like that for a few minutes and then temp gauge goes up and stops on 90 degrees but when I release gas pedal temp is falling down immediately. This is very strange and I just dont believe that both thermostats not working well and coolant temperature sensor also. If you have some ideas what to do or check next please tell me I'm without any. Thank you all.

This morning after I drove 33 kilometers going to work.






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[Gunnark100]

This morning after I drove 33 kilometers going to work.Sent from my iPhone using Tapatalk

Not a fact in your case, but few people were lucky after replacing this 1K0121113A in A4 2.0TDI

[Audidua]

What is that? Thermostat? Mine is 03L 121 113 A and replaced twice till now


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[Gunnark100]

What is that? Thermostat? Mine is 03L 121 113 A and replaced twice till now Sent from my iPhone using Tapatalk

Some places call this termostat, some cooler regulator etc,,,,your car has so to say two thermostats, this one is located between hoses, not the same place as normal termostat 03L 121 113 A!Translate with browser(one click), as i said, few people changed this out and solved problem, but not for all:A4 B8 - �е греет�� двигатель 2.0tdi | Audi Клуб

[Audidua]

I looked in ETKA and part number 1K0 121 113A is for coolant regulator (or thermostat) for A3,Q3 and TT, no A4 8k. Here is link Online VAG spare parts catalogue: Volkswagen, Audi, Skoda, Seat, part number '1k0121113A' - coolant regulator just click on tab EUROPE and you'll see which model and year have that part.

[Gunnark100]

I looked in ETKA and part number 1K0 121 113A is for coolant regulator (or thermostat) for A3,Q3 and TT, no A4 8k. Here is link Online VAG spare parts catalogue: Volkswagen, Audi, Skoda, Seat, part number '1k0121113A' - coolant regulator just click on tab EUROPE and you'll see which model and year have that part.

I know its not listed as separate part for 8k(you did not read/translated the link), it does not mean its not part of the cooling system! You can pay 3-5 times more and take full set with hose etc! As i said in first post, its not 100% solution for everybody!

[Audidua]

I did translate it and I understand what you trying to say but it is very odd this part isnt in ETKA for A4 b8 2.0 TDI. I checked whole coolant instalation and theres no such part even without part number. Can you find it your self and show me the illustration? Thanks


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[Audidua]

I've found additional info about that thermostat one of those men said that the fault was in the thermostat which is in 03L121157B tube. I checked with ETKA and there it is a coolant hose. Now I have to check under the hood how it looks like and if I can take it off and see if thermostat is in there and change it.

[Gunnark100]

As i said its part of the hose on b8, thats why you cant see this on diagram:

Last revision for hose i guess is M and hose number 23!

lower small hose left side there you see regulator!

http://i.ebayimg.com/00/s/NTMzWDgwMA==/z/makAAOSwzJ5Xf8UX/$_1.JPG

[Audidua]

Yes, number 23 is on illustration, 03L 121 157 B is part number for my car engine code CAGA