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Chevrolet Malibu 2000 malibu cooling fans not working

Customer Question
2000 malibu cooling fans not...
2000 malibu cooling fans not working
Submitted: 6 years ago.Category: Chevy
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Answered in 2 minutes by:
4/21/2011
Chevy Mechanic: Dan, Technician replied 6 years ago
Dan
Dan, Technician
Category: Chevy
Satisfied Customers: 24,964
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Disconnect coolant temp sensor and see if fans come on, if so replace radiator cap. If they still dont come on verify water pump is working, radiator isnt clogged, then replace coolant temp sensor.

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Customer reply replied 6 years ago

radiator has ben flushed, coolant sensor has been replaced and all fuses and relays have been checked. when the sensor is disconnected fans will run. they wil lnot come on when the ac is turned on and sensor is connected.

Chevy Mechanic: Dan, Technician replied 6 years ago
Replace the radiator cap and see if that helps, its a simple thing so can be easily overlooked.
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Customer reply replied 6 years ago

the fans should come on when the a/c is on correct? and it doesnt. how is a cap going to fix that?

 

Chevy Mechanic: Dan, Technician replied 6 years ago

Usually the AC only turns on the cooling fans once the coolant has reached a certain temp. But if the cap has failed its lowering the boiling point of the coolant causing it to boil then the sensor gets a poor reading thinking the coolant is colder then it actually is.

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Customer reply replied 6 years ago

according to the service maual, the fans should turn on as soon as the a/c is in the on position. the owner of the car told me that just out a new cap on it just last week. so, i guess that elimanates the cap.

Chevy Mechanic: Dan, Technician replied 6 years ago
They could still be seperate problems........The only way they could be related is if the PCM has failed. Otherwise the cap could be causing it not to turn on with correct temp and ac pressure switch could be causing problem with fans not turning on with AC.
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Customer reply replied 6 years ago
Relist: Incomplete answer.
Chevy Mechanic: Dan, Technician replied 6 years ago
You can check resistance or ECT sensor to see if its reading correctly or not to determine if problem is cap or pcm. If no ohm meter it can be connected to a high end scantool to see if ect is reading correctly.
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Dan
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