Question about 1998 Cadillac DeVille

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I have 98 caddy and my radiator fans dont come on so my car overheats i dont know what to do

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Check the fuses, relays and engine coolant temperture sensor

Posted on Nov 09, 2010

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1 Answer

98 jeep Cherokee keeps over heating


Several possibilities, including blockage in coolant tubes of radiator, damaged or slipping impeller on water pump, blockage of air flow through radiator, inoperative radiator fan(s), damaged head or head gasket...

Does the radiator fan come on? If not, problem could be bad temp sensor or fan motor or wiring.

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Check the fan operation to the radiator. If the secondary fan doesn't come on it can't dissipate the heat generated from the condensor. There are relays that control the fan under the hood in the electrical center. Check power and ground to both fans when vehicle running A/C on, both fans should be running. Check for blockage in front of rad / condensor.

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I think you may need a new radiator core.Flushing can only do so much and if the core is badly blocked no ammount of flushing will solve the problem. You could also chech there is no air in the system by undoing one of the heater hoses on the engine. Make sure there is no problem with the bellts and the water pump is spinning. Also check the water pump for any leaks or wobble on the shaft. If the impeller is bady corroded you can have heating problems.

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If your thermostat is stuck in the closed position , it will not let coolant circulate to the radiator and the engine will overheat quickly. Fans won't come on because the temp sensor for the fans is usualy in the radiator. If the thermostat dosn't send hot coolant to the radiator , the fans don't know they should be on.
Only solution is to replace the faulty thermostat. I recomend that you dont drive the car at all with the bad thermostat. major overheat could severly damage Heads , head gasket , engine.

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The cap on the coolent reservoir may not be maintaining the correct pressure. It could also be a faulty thermostat or a defective drivebelt, hope this helps

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