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The thermostat is one problem area, fan clutch (or pump, or belt) possibly another. 200 1987

posted by  Ken C on  Mon Apr 25 06:29 CST 2005
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last visit: Fri Oct 24 11:39 CST 2014
[RELATED]

re: "...if wind was hitting the radiator the temp guage would dip down to almost the 7 oclock possition...."

With a proper thermostat (and assuming your temp gauge is working right), your temperature shouldn't be able to drop to 7 o'clock -- it's a sign that the thermostat, for one thing, certainly isn't working right (probably stuck open).

re: "...set in traffic for two hours and I noticed it would heat up in gear but not in neutral...."

In gear, your engine rpm is lower; out of gear, it rises. At lower engine speed you're not getting adequate cooling -- could be the fan clutch (not enough air flow) or water pump (not enough circulation of coolant), but probably the former (fan clutch), as water pumps don't usually fail this way.

Could also be a loose fan belt, allowing slippage that could contribute to both slower fan and pump speeds!






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