Join Date: Jul 2008
Location: United Kingdom
Re: New thermostat, runs cooler!!??
This is an ongoing "problem" which I find difficult to agree with a lot of people on. My car will run at approx 80-90C around town and will never go above 92C in heavy traffic. On motorways, and with faster speeds in general, the temp gauge will drop to around 70C. This is the same story as many, many others have.
Now here's my results: upon starting the car from cold, I have held the coolant pipe that runs from the thermostat, it would stay completely cold for approx 8-10 mins, at which point the engine would have got to 80+C and a sudden rush of heat would make it's way down the pipe. Therefore I would deduce from this that the stat is fully closed when cold and opening properly. NO warmth is felt from the pipe at all during the first 8-10 minutes of the engine running. Which wouldn't be the case if the stat was slightly stuck open. I even tested the stat in a pan of boiling water and saw that it opened and closed - albeit quite slowly - with no problems. My fuel economy is as Alfa Romeo state in the GTV brochure and performance is fine.
I would be inclined to think the temp sensor is the culprit in a lot of cases, not the thermostat. Unless of course the stat is not adapting to the temp change quickly enough, which would make sense.
With reliability will ultimately come monotony.....
Last edited by StormVR6; 10-11-08 at 20:45.