[s-cars] An overheating '93 UrS4

[Varon H. Fugman]

>>The symptoms are as follows:

>>1. The upper radiator hose is hot
>>2. The entire radiator is cold except for the tiny area around the upper
radiator hose
>>3. The engine idles at the second slim hash mark at 13:00
>>4. After a while the valve in the pressure cap blows releasing a geyser
of coolant
>>5. Heat is coming into the cabin, thus I am sure the coolant circulates
throughout the heater core
>>6. The lower radiator hose is cold

Sure sounds like a stuck thermostat.  If the water pump impeller had failed,
there probably wouldn't be much heat to the cabin, would there?

Sounds like it would have to be an intermittant failure, though, if you just
drove the car and it was OK.  If has been sticking periodically, it could
have been overheating now and then and forcing out some coolant.

Make sure to boil the new thermostat on the stove to test it!

BTW, isn't any coolant released by the pressure cap supposed to be ducted
down through the coolant reservoir and come out underneith?

Varon
'95 S6 sporting a new coolant reservoir and many new hoses

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