Quote:
Originally Posted by barry12345
If the coolant system is overloaded the removal of heat by the heater core would result in a continious temperature drop remaining at the indicated lowered temperature. Yes what is occuring does point to the thermostat working but not properly I believe.
For some reason it is regulating at a higher temperature than desired. As mentioned could even be as simple as trapped air. I do not think the new thermostat is bad particularily but do suspect the temperature readings at the thermostat housing will be less than at the area of the temperature sensor on this particular car. If not the thermostat is bad or installed backwards.
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I'm starting to be fairly suspect of the thermostat as well. While it seems like it's working, it just seems to be doing it's job at a consistently higher temperature than what it should be.
I don't remember the exact numbers, but the temperature at the thermostat housing was lower than on the cylinder head. The highest temperatures were (naturally) on the head.
I'm pretty sure all the air is out of the system, too. I don't get any temperature spikes while driving that would indicate hot air passing by the temperature sensor. While refilling the system with coolant, I initially had the front end of the car up as high as it would go before the tailpipe contacted the ground. (I work at an exhaust shop, so I have access to lifts and such to enable that type of front-end elevation.) I ran the engine till it reached operating temperature (thermostat open) with the heat on high and then lowered the front end of the car until the front tires were about 5 inches off the ground. This enabled me to get a more accurate coolant level reading on the expansion tank, and I burped/topped off the system for about 20 minutes.
Having done that, I'm pretty sure all the air is out. Also, I'm 100% sure the thermostat is installed correctly.
I've been reading a bit about complaints people are having with thermostats not opening at the correct temperature. It seems like many of the 80C thermostats being sold are simply not opening at 80C, but rather at the higher end of the product's "rating tolerances." I honestly can't remember the particular brand of thermostat I've got in my car at the moment, but I think it's a Wahler. Do the OEM Behr seem to be more accurate and consistent at opening right at 80C?
Thanks.