2006 Cobalt 2.2 radiator fan doesn't come on. Any help diagnosing would be appreciated.

10

Asked by Jun 20, 2017 at 10:17 PM about the 2006 Chevrolet Cobalt LS Coupe

Question type: Maintenance & Repair

Radiator fan will not start automatically even when temperature is above 200F.  The temp. sensor displays the correct temp. and if disconnected it displays -48F and the fan runs.  Fan relay is good.  Can run fan from either relay.  Freon is bleed from AC so can force it to start by turning on AC. It tests as if the #2 relay has an open ground on the coil side.  Can't get access on #I relay to check it.

2 Answers

1,720

not the answer you want but you need to get to the other relay and inspect.

10

Have tested the relays out of the car and swapped out with one new one in both positions. No change. I don't have a wiring diagram for the coil side of the relays. I have 12V to coil side of the relays but the circuit is open somewhere on the ground side after the coil. Not sure what switch closes the coil circuit at temperature (ECM?). I think the set points are 190 for low speed fan and 195 for high speed fan. I don't have wiring diagram. Could the temperature sensor or a connection to it being faulty cause the fan not to engage yet provide the correct engine temperature. This started with a stuck thermostat a couple weeks ago and the fan was working fine so I wonder if I did something inadvertently to the fan control circuit.

Your Answer

Chevrolet Cobalt Experts

  • #1
    lightGear
    Reputation
    1,170
  • #2
    munron
    Reputation
    1,060
  • #3
    dandyoun
    Reputation
    970
View All

Related Models For Sale

Used Honda Civic
296 Great Deals out of 3,192 listings starting at $995
Used Chevrolet Malibu
88 Great Deals out of 2,035 listings starting at $2,994
Used Ford Focus
88 Great Deals out of 2,600 listings starting at $599
Used Chevrolet Impala
151 Great Deals out of 1,045 listings starting at $1,500
Used Ford Mustang
10 Great Deals out of 1,030 listings starting at $4,500
Used Honda Accord
87 Great Deals out of 907 listings starting at $1,411
Used Toyota Camry
88 Great Deals out of 2,271 listings starting at $1,995
Used Nissan Altima
83 Great Deals out of 1,419 listings starting at $1,785
Used Toyota Corolla
240 Great Deals out of 4,002 listings starting at $1,840
Used Ford Fusion
174 Great Deals out of 2,065 listings starting at $995
Used Chevrolet Silverado 1500
191 Great Deals out of 10,551 listings starting at $1,700

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.