I did some repairs on my 1985 Volvo 240 DL today and had to drain the coolant from my engine. After replacing the coolant I was driving and the engine temperature gauge went to full hot and overheated within about 5 minutes. I then let it cool, unscrewed the radiator cap, started up the vehicle, and let it run to get rid of any air pockets. This seemed to work as the engine temperature did not heat up excessively. However, it did not heat up at all, even after driving for another 10 minutes. The temperature gauge stayed at cold and the heater was blowing excessively cold air. Obviously the thermostat is stuck in the open position now, but why? Is that a normal response when the vehicle had overheated before due to air pockets in the cooling system? Is there a way to reset the thermostat or do I need to replace it? Thanks.
Sunday, November 21st, 2010 AT 9:51 AM