2002 Audi A4 3.0 overheating
#1
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2002 Audi A4 3.0 overheating
Please HELP
I just got a 2002 Audi A4 3.0 and the person who owned it before me recently had the timing belt, water pump and thermostat replaced. The shop that replaced the timing belt didn't do it correctly and the car was misfiring. I finally got that resolved. I just noticed that the car is overheating. When the car is moving everything is fine, but if I'm standing at a light the gauge starts to go up. As soon as the temperature gauge starts to go up I would take the cap off the overflow tank to remove some of the pressure, the temperature would go back to normal. Any suggestions??????????
I just got a 2002 Audi A4 3.0 and the person who owned it before me recently had the timing belt, water pump and thermostat replaced. The shop that replaced the timing belt didn't do it correctly and the car was misfiring. I finally got that resolved. I just noticed that the car is overheating. When the car is moving everything is fine, but if I'm standing at a light the gauge starts to go up. As soon as the temperature gauge starts to go up I would take the cap off the overflow tank to remove some of the pressure, the temperature would go back to normal. Any suggestions??????????
#2
AudiWorld Super User
Assuming you really do have a new pump and thermostat and the belt is spinning the water properly (based on the history I would be a little vervous here), then it is probably the fans. Are the fans coming on when it is overheating? If not, you probably have a bad fan control module or it is disconnected.
#3
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Yes, the fans do come on. When the car runs for about 5 min you can hear the fans turn on. After about 15min the tempereture gauge starts to go up. As soon as I remove the cap from the overflow tank and release the pressure the gauge goes back to normal. I've also noticed that when I release the pressure it feels like the coolant is boiling the the overflow tank.
#4
Yes, the fans do come on. When the car runs for about 5 min you can hear the fans turn on. After about 15min the tempereture gauge starts to go up. As soon as I remove the cap from the overflow tank and release the pressure the gauge goes back to normal. I've also noticed that when I release the pressure it feels like the coolant is boiling the the overflow tank.
#5
AudiWorld Super User
I am with the comment on the cap; this is very dangerous. The reason is appears to work is a simple p=density*R*T thing, i.e., when you pop the cap, pressure goes down and then temp...at least temporarily.
My 2 cents: If the fans are coming on, you have a heat exchange problem which means the pump is not flowing properly, the thermostat is not operating, or the radiator is not exchanging heat. Since you say the pump and thermostat are presumeably new, then that leaves the radiator.
My 2 cents: If the fans are coming on, you have a heat exchange problem which means the pump is not flowing properly, the thermostat is not operating, or the radiator is not exchanging heat. Since you say the pump and thermostat are presumeably new, then that leaves the radiator.
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