Vwmk3vr6 1 Posted September 30, 2020 Report Share Posted September 30, 2020 Engine runs at idle fans come on but engine temp rises to 210 and holds but doesn't cool car down to shut off . Replaced fcm temp sensors water pump heater core did a combustion test so either its the radiator a bad weak upper radiator hose or one of the sensors is still bad?? I did put in a 180f thermostat replacing the 160f one would this cause it? But 180f is oem. Stumped!! Link to post Share on other sites
Harry-vr6 31 Posted October 1, 2020 Report Share Posted October 1, 2020 b251965561BCheck this Link to post Share on other sites
Harry-vr6 31 Posted October 1, 2020 Report Share Posted October 1, 2020 After run coolant pump AUX Link to post Share on other sites
Vwmk3vr6 1 Posted October 1, 2020 Author Report Share Posted October 1, 2020 Replaced aux water pump when first got car had no heat in cabin and while old won turned on it wasn't pumping water and that's why the heater core water pump thermostat and all the sensors were replaced. Think i will try putting back in the 160f thermostat and see the only thing left is a weak upper hose or radiator itself. Link to post Share on other sites
Harry-vr6 31 Posted October 3, 2020 Report Share Posted October 3, 2020 Did you replace the Aux pump yourself? And i would try another stat in that case. Also to mention i have a mk 6 golf which does what you describe my temp would go over 100 and fans would kick in however the temp wouldn't drop, i bled the system and haven't had the issue again Link to post Share on other sites
Vwmk3vr6 1 Posted October 7, 2020 Author Report Share Posted October 7, 2020 Ill try again since im replacing all hoses and put 160f back in if that don't work then it is what it is . Luv my vw such a fun hobby lol Link to post Share on other sites
Harry-vr6 31 Posted October 7, 2020 Report Share Posted October 7, 2020 Ye definitely replace it as they canFail, mine is under 1 years old and has failed as it sticks in my mk6 golf need to do that then back on to my vr project. Hopefully things work out for you Link to post Share on other sites
Vwmk3vr6 1 Posted November 22, 2020 Author Report Share Posted November 22, 2020 So replaced with 160f thermostat and it ran too cold but fans worked like they should so i put the 180f back in since i didnt want to drive so cold but now back to sqaure one fans come on at 197 f and if i let car idle they never go off only after shut down do they go off after 5-10 min. Now going to try low temp thermo switch on radiator if that dont work think i might put 160f thermostat back in. Im i just fixing a. Car that should run like this is it normal to have fans on after every drive? Link to post Share on other sites
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