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  #1  
Old June 25th, 2010, 06:03 PM
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Martin Spencer
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overheating

I have a 94 d90 with a/c installed. when I leave my truck idling with the a/c on it overheats. If I turn off the a/c it doesn't overheat. Any suggestions?
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  #2  
Old June 25th, 2010, 06:29 PM
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Scott
1997 D90 ST #1444
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Don't turn on the AC...problem solved.

It has been very hot in the South the past few days, even my Yukon's temperature went up a bit, when I left it running when I ran into my office for 15 mins.

I am guessing that the increased heat, with the extra strain on your engine, by leaving the motor on and the AC running is contributing to the increase in temp.
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Old June 26th, 2010, 11:22 PM
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david summers
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Are the AC fans spinning? What about the age/condition of the viscous coupling? Have you sprayed/cleaned the radiator?
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  #4  
Old June 26th, 2010, 11:29 PM
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Martin Spencer
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the fans seem to be functioning correctly. Not sure about the viscous coupling??? The radiator is clean.
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  #5  
Old June 27th, 2010, 04:09 AM
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Rich Campbell
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Are you sure it is actually running hot? Mine did the same thing with the a/c on and turned out to be a bad ground in the gauge.
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Old June 27th, 2010, 08:01 AM
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Martin Spencer
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there was coolant boiling out of the overflow. It doesn't get hot without the a/c on, so when I leave the truck idling I am just turning off the a/c.
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