A4 b8 2.0tdi 105kW problem with coolant temperature

**Audidua** · 23-11-2017,10:24 AM

If your car is facelift model there shouldn't be more than one thermostat. Where is second thermostat placed and which part number it has? As far as I know only preFL cars have two thermostats and one is hidden in rubber hose which connect oil cooler and exhaust gas cooler part number 03L 121 157 B

**borut032** · 23-11-2017,10:59 AM

Yes,
Temperature on vcds is 85 C, odometer show 90 C. when I test whole odometer, all index finger came to max (also temperature), before hi isn't.
and then he is in the middle, like others. I think that now is ok.

But I don't know, why the temperature index finger in not in the correct position (manufacturer failure?)
What was with him, when the car was new....

**borut032** · 23-11-2017,11:06 AM

no, my car is facelift, motor code CJCA. it has two termostat. On the block of motor and hose ....

**doktorrrr** · 11-02-2018,01:30 AM

I have the same problem with my Audi A4 Quattro 2013. 2.0 TDI 110 kW. My problem is started after the replacement timing belt and water pump. My car is facelift but still, have two thermostats. Both of them replaced. Now, I'm interested in return valve in the hose. Can anybody confirm what is a solution of the problem?

**borut032** · 11-02-2018,04:48 PM

Hello,
Do you have return valve? My has only hose termostat (second termostat) without return valve... in what position is temperature index finger on the odometer when the ignition is off? It must be minimum at 50 0C

**doktorrrr** · 11-02-2018,07:32 PM

No. I'm looking for this return valve today. My car doesn't have this return valve. Can Audidua confirm solution of the problem?

**Audidua** · 11-02-2018,08:28 PM

I dont know where no-return valve is on FL cars. Im looking for it on my A5 2.0tdi, found second thermostat only by now.

**doktorrrr** · 12-02-2018,11:15 AM

So, you didn't solve your problem? I think that return valve doesn't exist in facelift models. I can't see return valve in hoses in my car 2013. model. Only second thermostat.

**Audidua** · 12-02-2018,11:42 AM

No, I didnt but I think it is normal behaviour when I on motorway temperature sits on 90 degrees and when I'm driving on local city streets and heating is set on 24°C there is a little oscilation on temp gauge where not sitting on 90. I'll leave it like that will not care anymore.

**doktorrrr** · 12-02-2018,10:15 PM

I'm freezing with 24ºC. If I set my heating on 26 ºC I feel a little heat only after 5-6 km. Temp outside is 8 - 13 ºC these days. It would be interesting to test our thermostats. Does it really open at 87 ºC or less?