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Old 05-07-2006, 08:10 PM
kenblasko kenblasko is offline
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Join Date: Dec 2005
Posts: 16
Quote:
Originally Posted by fulltimefamily
Thanks very much for the help and response.
I've cracked open a beer at 9am to celebrate the cheap fix with a $12 thermostat. ( I going to look around at how much a radiator replacement would run to determine how many beers this calls for).

Here are my thoughts on trouble shooting though I have close to no mechanical ability.

I thought to remove the thermostat (though I did not check it's operation on the stove till today). I found that my car overheated just as readily with no thermostat as with a non working one. I did check the operation of the new thermostat in the same pan on the stove with the old one before installing it (new one works, old one didn't).

The car now runs about 9 degrees cooler (about 96 instead of bouncing around 105 at what i used to consider "normal") It had recently been heading toward redline at 125.

However the fan still "freewheels" at 96degrees. Should I be concerned if the fan clutch engages at this low temp? I don't know what temp will activate the clutch but it does not concern me as long as things are running this cool.

I just offered this as an observation since so many forum replies suggest clutch replacement if it free wheels at normal operation temp. I wonder if the fan is even called upon for cooling under mild driving conditions and is working just fine by not working?
Your car should normally run at 87 degrees C not 96. You may want to replace the coolant temperature switch which could be giving you a bad reading. My 95 C280 seemed to run hot also (fluctuating between 95 and 105 degrees C even to 110 on occassion). The new switch made the temp guage virtually rock solid at 87 degrees C. Now only when it's in stop and go traffic in 100 degree Phoenix heat does it move to maybe 92 degrees C. Then it moves quickly back down to normal when moving. Your viscous fan is probably okay. It should rotate very freely even when hot.
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