Join Date: Feb 2017
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2012 VW Touareg 3.0TDI engine overheating, no hot air, irregular coolant loss problem
Hi everyone, i'm new in this forum.
I have a big problem with my car which no one in my country (Estonia) cant help me, so im hoping, that someone from here can.
Symptoms: at highway speeds car will overheat slightly (110C or so) and temp gauge moves up and down. At the same time there is no hot air coming from vents. Sometimes i can regulate engine temp with lower gears, at high revs, it will drop to 90 C. But sometimes it will go to 120C for a second and blows some coolant out and then drops to 90 C again (this happens in the matter of seconds). Then is everything ok and warm air comes from vents.
Sometimes engine temp is fine, but still no hot air from vents. Today morning (-13C outside) i started my car for warming up and after 30 min engine temp was 90 C, but cabin was cold and after i started driving hot air came.
Strange thing is, that sometimes the car works just fine about 1 week with no problems and sometimes it one day works and other day not.
I have already changed thermostat and some other coolant regulator valve (059121737am). VCDS wont show anything.
I have to add coolant sometimes over 60 miles sometimes over 600 miles. Dealer said, that there is no leaks and it boils out sometimes.
I hope i made myself clear enough.