The 9000 I bought a couple of months ago has a 82 degree thermostat in it. I'm in Vermont, where we'll probably have some sub-zero F days this winter. So far I've driven in 5 degrees F with everything seeming pretty normal, although the temp needle rides about a quarter-inch from the blue bottom when highway cruising. Is there a mechanical reason I need to switch to a higher temperature thermostat for the winter?
Why should a coolant temperature of 82C be OK for the engine in summer but not in winter?
After warm up, an 82C thermostat should maintain that temperature regardless of the outside ambient temperature unless it is faulty. It is easily checked. Remove the thermostat and verify it is closed when cold. Heat it in a saucepan of water on your stove and with a cooking thermometer check that it opens at its rated temperature.
That is a 180 F thermostat which is normal. You may notice that most everything is metric on the car. 82 C is the proper temp. You are fine
You don't say whay year your 9000 is, but one thing to keep in mind re. your temperature guage reading is that because at least some models of the earlier years of 9000's tended to run hot under some conditions, which apparently resulted in a lot of unnecessary back-to-the-dealer trips from concerned owners, a revision was made that so that the coolant temperature sensor feeding the temperature guage was run first through the trionic engine managment computer - the guage reading is not a 'true' temperature reading on the later models, it is just what the computer wants you to know. I don't know when this change happened (I used to own a '91 9000Turbo and it seemed to run fine to me re. temperature, but it may have been the same system) but I do know that it is managed that way on my current '95 Aero - as I learned when the sensor failed - the coolant temp. sensor that feeds the guage (evidently there are several other coolant temp. sensors used by the system for other purposes) is located in the head near the throttle body and it is also the sensor that controls the electric fan for the radiator - it runs through the trionic engine management computer before doing either.
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I have an 82c thermostat and fan control in my 86 900t and have had no problems recently. I am in MA and had a couple of really cold days this week (less than 20 f) and had no problems with the 82c parts.
Jeremy
bozo wrote:
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