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Re: 1999 grand am se v6 3.4
Tranny fluid low this could cause the over heat
flushing the rad doesnt always clear the clog sometimes it can make things worst
water pump not flowing properly too much calcium build up inside
if a/c compressor connected the bearings could be seizing slowly maken a drag on the engine to overheat
these are somethings i can think of off the top of my head at this time i hope this helped
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not good wendy, most likely cause is a blown cylinder head gasket, but have someone check to make sure the thermostat is opening( if you let the engine idle for around 10min the top radiator hose will get hot when the thermostat opens if the engine overheats before the top hose gets hot then replace the thermostat) if the thermostat is poening then supect the head gasket.
You either need a new thermostat or the water pump impeller is worn out,this is if the rad fan is working,if the rad fan is not working then you likely need a coolant sensor or a rad fan relay.the water pump impeller is not a serviceable part ,so of it is worn you will need to replace the pump.
you could try that special stuf for your toilet to flush out any debri plug one side of the radiator real thight fill it with the toilet stuf with boiling water follow the instuctions on the bottle its a thought
Have someone flush cooling system & check condition of rad for debris in front of rad & blow or spray it out as necessary. Next time it runs hot, turn your heater temperature up high, blower fan on high, and see if gauge starts to come back down a little. If it does, my guess is your rad needs replacing, or at least consider trying a good reverse flushing of the system first, then rad.