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Hi Bill, is the engine actually getting hot enough for the fans to come on? if the engine does have overheating problem (but you say the temp gauge reads normal) then i would check the operation of the engine temp switch, there are two, one for the gauge and one for the fans.
P2181 - Performance Malfunction in Cooling System Possible Solutions * Check Engine Coolant Temperature Sender (G62) * Check Coolant Thermostat * Check Engine Cooling System o Put the key on, fan speed on 1, and push the a/c switch. Are both fans kicking on? If not, you found the problem. o Put the key on and fan speed on 1. Does heat come out readily from the vents? + No. Probably the water pump is gone. + Yes. Probably the thermostat is gone. good- luck!!
If you have done this already,then bleed the cooling system,this is all you lack,just get the air out of the system,two bleed ports,one on the thermostat housing,and one on the engine near the water pump,just bleed them out as the car warms up,the thermostat bleeder last,if this was at all helpful,please rate,thank you.
If it was the thermostat, it would run hot all the time. Sounds more like the electric cooling fans are not working. Either the fans themselves are not working, or the coolant temperature sensor is bad and not sending a signal to the computor to turn them on. Have the fans checked first, then go for the sensor if it isn't the fans.
What is the mileage? Check the reservoir for coolant, when the engine is COLD,... I repeat COLD, check the radiator for fluid. If fluid is present, check to see if your fans are working properly, turn your AC on and your fans in front of your motor should kick in within minutes.
If you have coolant in the reservoir and radiator (suspect a new thermostat, replacing the radiator will benefit greatly too)
If your fans do not turn on within minutes, replace your radiator fan relay.
is your engine running hot? did they replace it with new radiator or just patch it up. I only reason why your car do what it does is that the radiator is building up too much pressure and not circulating through the engine. replace the thermostats and the switch along making sure you colling fans is working. does the fan run at all when the engine is hot? turn your ac button off so that way the ac fan is not running. see if you cooling fans kicks on when idling long period, watch your temperature, don't let it get hot, if it does turn it off and have the fan check and the water pump; change thermostat and the switch if you haven't had it done.
To find out about the CTS (the sensor the above clarification request is referring to), try disconnecting the wiring harness. It's right behind the thermostat housing and upper radiator hose. If your fans kick on while the engine is running, it's probably an issue with your PCM (computer).
the first thing to check is to have the engine running. as soon as it reaches operating temp the upper radiator hose should get hot. if it doesn't then it's the thermostat. if it does then i believe your water pump is probably not circulating like it should and it should be replaced. however before replacing the wter pump make sure that the wire to sending unit is tight and not giving you a false reading. if your model has electric fans make sure the fans are running when the engine is hot. if they are not running check the relay in the fuse box for the fans with the engine running switch out the fan relay with the a/c clutch relay. ifthe fans kick on replay the relay with a new one. if they don't click on the it's either a bad wire or the temp sensor probe is bad. hope this answers your question. please rate this solution...thanks.