88 quattro 90 boiling coolant
I am trying to identify the real source of the overheat issue. First, I am not able to get the fan to turn via the normal sensor. Any help in identifying the location of the sensor? I have tracked down a frustrating ground issue to get the fan working at all. Now I can force the fan on with the AC switch, but still have the overheating issue. Found and replaced a leaking coolant hose and also notes that the top radiator hose connection has broken off shorter than original. See pic. I am able to hold pressure and drive with what appears to be a normal heat up cycle, Heater core heats up quickly and gets very hot, but it just keeps going too hot on the temp guage, and then (AC= fan on) the boiling noises are my indication that it is time to shut down. I think I have burped all air from system. I am affraid that it may be a sticky Tstat or some of the bits from the deteriorating radiator plastic has caused a restriction.
Any input on trouble shooting experience would be appreciated. Any one have a good diagram of the cooling system function? I have never done a Tstat on this car, and it sounds like it is as much work as the complete tear down of the front of the motor for a water pump and tbelt job??? Any feedback on the labor involved ? TIA Scott.
Last edited by sostahoe; 02-15-2011 at 04:02 PM.