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

1,740

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
    1,180
  • #2
    munron
    Reputation
    1,080
  • #3
    dandyoun
    Reputation
    970
View All

Related Models For Sale

Used Honda Civic
704 Great Deals out of 63,494 listings starting at $999
Used Chevrolet Malibu
1,042 Great Deals out of 62,697 listings starting at $880
Used Ford Focus
749 Great Deals out of 57,418 listings starting at $1,150
Used Chevrolet Impala
547 Great Deals out of 34,764 listings starting at $990
Used Toyota Corolla
931 Great Deals out of 60,270 listings starting at $850
Used Ford Mustang
553 Great Deals out of 36,669 listings starting at $2,595
Used Honda Accord
1,101 Great Deals out of 66,074 listings starting at $561
Used Dodge Charger
357 Great Deals out of 30,331 listings starting at $2,000
Used Chevrolet Silverado 1500
2,407 Great Deals out of 173,484 listings starting at $699
Used Ford Fusion
951 Great Deals out of 64,483 listings starting at $888
Used Toyota Camry
954 Great Deals out of 90,183 listings starting at $300

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.