Hi, I just bought a 93 Volvo 960 with the turbo engine and it runs great. Only problem is that when the car is up at speeds, the heat output isn't very much, and the engine temp gauge indicates that the engine is cold. Once the car stops and sits for a few moments, the temp comes back up, the gauge reads correctly and the heat comes right back to an normal level. I was thinking that this could a thermostat, any advice? Also I live in the northeast, and it's been about 30 degrees just as background information. Thanks for the help.