Totally Stumpped. Overheating
#1
Totally Stumpped. Overheating
This Audi is driving me crazy. I just purchased it a month ago. Replaced timing belt,water pump, both coolant sensors, thermostat and expansion tank and cap. Bleed cooling system, now coolant is boiling over in tank. Temp gauge never goes past half way. Just got VCDS, no errors for cooling sensors. I'm totally stumped.Any idea what to check or look into. Pretty positive thermostat is not opening, top hose is hot, lower is cold. With the electronic thermostat is there any way to test? Any help is appreciated. Car is an 05 1.8t with a 6 speed
Last edited by Jvannote; 03-02-2020 at 10:26 PM. Reason: Vehicle info
#2
You said that you replaced the coolant pump, but symptoms say non-functioning pump. Boiling coolant in the reservoir says the coolant is not circulating through the head, same for lack of heat detected by the CTS, same for cold lower hose.
#3
This Audi is driving me crazy. I just purchased it a month ago. Replaced timing belt,water pump, both coolant sensors, thermostat and expansion tank and cap. Bleed cooling system, now coolant is boiling over in tank. Temp gauge never goes past half way. Just got VCDS, no errors for cooling sensors. I'm totally stumped.Any idea what to check or look into. Pretty positive thermostat is not opening, top hose is hot, lower is cold. With the electronic thermostat is there any way to test? Any help is appreciated. Car is an 05 1.8t with a 6 speed
#4
Also check for cracks between valves if you end up removing the head (might as well change the head gasket while you're there too) If you end up pulling the head, you should replace the rear coolant flange as those warp and leak and cause problems and are relatively difficult to swap with everything in the way. I heard people talking about swapping that flange being the hardest thing to do on the car, so when it didn't take that long for me I was pleasantly surprised and if you get the chance to change it while the head is off, even better and easier.
#6
If you have the original AMB head, it's far more likely a crack has formed or the head has started to warp than a head gasket issue. Blown head gaskets happen, but seem to be less frequent than head issues.
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