No low speed cooling fan

GOTTAKEEPMOVIN'

MEMBER
2008 CHEVROLET COBALT
2.4L
4 CYL
2WD
AUTOMATIC
207,000 MILES

I have a 2-speed single cooling fan. I am having issues where the low speed fan does not seem to come on, and yet the hi-speed fan is blowing the 30A fuses. I have swapped relays from Cool Fan 1 and Cool Fan 2 with no change in symptom. Cool Fan 2 does kick in at temperatures over 200 degrees F, but does eventually blow the fuse. Am I right in believing I have an issue with the low speed resistor? It is my belief that by the time the hi-speed fan (cool fan 2 circuit) kicks in (sometimes on quite often), it is overworking as it never kicked on in low speed (cool fan 1 circuit), and it is overheating/blowing the cool fan 2 fuse. I have not tested to see if the ECM is triggering the ground circuit for cool fan 1, but I am thinking with the high mileage as this car has, that it may be a resistor problem. Also, assuming I have to replace this resistor, what is the best method for removal and replacement? Symptom: Car will try to overheat at long lights and A/C turns warmer until cruising again. Due to no low-speed fan coming on. Thanks a million!

Sunday, June 30th, 2019 AT 2:41 PM

4 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon,

Cooling fan relay 2 is for the high speed fan. The resistor is only for low speed.

Cooling fan relay 1 goes through the resistor.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

You need to check for voltage at cooling fan motor with the A/C on which commands low speed.

https://www.2carpros.com/articles/how-to-check-wiring

I attached the wiring diagram for you of the fans. I think you need to replace the fan motor from drawing too much current and blowing the fuse.

Roy

Cooling Fan and Shroud Replacement (2.2L (L61), 2.4L (LE5))

Removal Procedure

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1. Disconnect the cooling fan electrical connector.

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2. Remove the cooling fan wire from the fan shroud.
3. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

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4. Remove the cooling fan assembly from the radiator by pushing up on the fan shroud to unsnap the retaining features. Position the cooling fan assembly away from the radiator.

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