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A/c problem a/c fan does not come on when I turn on the A/C. I checked fuses. they seem fine

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I have a 08 nitro that the cooling fan never comes in causing over heating I've replaced water pump radiator heater core because it was bad the relay seems fine power coming in and out but no fan on


check fuses and coolant temp sensor
the coolant temperature sensor unit ( that is SENSOR not gauge sender unit) sends a report to the ecm to turn on the radiator fan when the temp is reached
If the fan is not coming on then the circuit is broken--sensor, wires ,fuses relay, fan-ecm
all have to be checked out

Jan 09, 2017 | 2008 Dodge Nitro

1 Answer

Why doesn't the A/C blower turn on when needed?


Could be bad switch since you can sometimes wiggle and make work. Also check ballast resistor to fan motor.

Jun 10, 2015 | Pontiac G6 Cars & Trucks

1 Answer

My mazda3 04 is overheating when i come to an idle but seems fine when im driving


Sounds like the cooling fan is not working. Check the larger fuses in the fuse block under the hood. They should be labeled or diagramed on the inside of the cover. If the fuses look good than swap the fan relay with another relay in the fuse block that looks the same. If the fan starts working and the system that the other relay controls stops working than replace the relay.

If the relay swap does not work than start the car and turn on the A/C. The fan should one on shortly after the compressor engages. If the fan still does not come on than you can check for power and ground to the fan or ohm check the fan itself to see if there is an open circuit. If you have power and ground and the fan is open than the fan will need to be replaced.

Apr 10, 2014 | 2004 Mazda 3

1 Answer

My 02 nissan pathfinder interior fan runs even when not turned on.checked all fuses they seem to be fine.


If fan still runs when all your heater control knobs and buttons are off, it is likely a bad heater fan switch. Unless you have something like a body control module found on newer cars that has some control over interior functions. If not, try a new heater fan switch. Good luck.

Jan 18, 2012 | Cars & Trucks

2 Answers

My car runs fine everythiing seems good, just had a new radiator put on it, but when my car sits running for awhile it starts to overheat, then i start to drive and it cools back down?. please help


Check the electric cooling fan. There will be a sensor on the engine to tell it to turn on. The electric motor itself may be defective, and lastly, there will be a fuse to power the motor. Also, if the engine has been running hot, it may have damaged the thermostat. But from your description, that doesn't seem likely. Hope this helps.

Apr 19, 2011 | Pontiac Grand Prix Cars & Trucks

2 Answers

1997 Subaru legacy cooling fan


No if it is stiff to turn,it is bad,replace it,and make sure there is not a blown fuse on top of the cooling fan being bad.

Apr 16, 2010 | 1997 Subaru Legacy

1 Answer

Coolant fans on a 92 coupe deville


You checked the fuses, that's a good place to start. Usually electric fans are powered up using a relay. It's likely that each fan has it's own individual relay so it's strange that niether fan works. Is the engine overheating? Try turning on the air conditioner after starting the engine. One of the two fans should definitely turn on immediately after switching on the A/C. If so, then the other fan, which would be controled by the temp sensor circuit, might be bad. Before replacing anything you may want to check the temperature sensor is working properly. The relay(s) are probably located in the engine compartment usually near the firewall. Hope this is helpful, if so, please remember to rate my response. Thanks.

Mar 03, 2009 | 1992 Cadillac DeVille

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