overheating in cold weather

GMC
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GJOHAL
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Car is a 2000 Olds Intrigue 65000miles
It is overheating when it gets cold and depends on the speed I am traveling at and how cold it is. For example at about 10-20degrees F and 40mph it overheats and when it's about 20-40 degrees F and 60mph it overheats. I usually have the heat on and turning off the heat completely brings the temperature gauge back down. It goes right back up when I turn the heat back on. It doesn't overheat when the car is idling or parked with the heat on so it's hard for me to troubleshoot. I know it's overheating because I start to hear a knocking sound coming from the engine. The coolant is fine and I have had it flushed already.
Mar 4, 2006 at 3:15 AM
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JPAM
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what setting do you have control at?? defrost??
Mar 4, 2006 at 3:31 AM
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GJOHAL
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The heater is usually on defrost windshield and heat to feet. It does the same thing if I try just defrost only. Either way I need the defrost on otherwise the windows fog up and eventually frost over.
Mar 4, 2006 at 12:24 PM
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JPAM
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just thinking that running it on defrost is about the same as running the A/C.. the motor got to work alittle more.... maybe water pump is going? or new thermostat...... any coolant seeping out of peehole on pump..??
Mar 4, 2006 at 12:49 PM
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GJOHAL
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There isn't any coolant leaking but how can I tell if the water pump is going or the thermostat? Is there any way to duplicate this problem so that I can narrow down the problem part?
Mar 4, 2006 at 7:47 PM