1995 Pontiac Grand Am. Repairs made = water pump, intake gaskets, thermostat, coolant temperature sensor, coolant flush. Question = This thing keeps overheating at idle well over the 220 mark. What else could it be there is no leak form the block or steam out the exhaust. Please help!
Answer: A couple of things to look at. You need to see exactly what the coolant temp. Is by using a scanner to make sure the gauge is accurate. The low speed cooling fan wont come on until 226 degrees, so you are not overheating until after that. Make sure the fan does come on at 226 f. Another thing to look for is bubbles in the radiator. That would be a sign of a blown head gasket. Those were known to leak externally, or blow internally at the lower portion of the rear head all the way on the passenger side; as viewed from underneath.
A restricted radiator can also cause this. Sometimes the radiator will have 'cool' spots in it as compared to the rest of the radiator. Best way to check is with a laser tempersature gun, but can do with you hands as long as you are careful not to get near fan blades. Let me know what find if you need more help.
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