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1999 sunfire sedan

Heater fan does not work, but sometimes runs very slow than stops

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  • mike tracy Feb 11, 2012

    Try tapping fan motor - if it starts back up you need a motor.



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Hi Andrew, Sounds to me as if the blower fan is being fouled in its operation. Are you ready for a lot of work? Get a container to put the small bits and bobs together with screws, nuts, bolts and other do hickies. Remove the controls and the trim on the center consul. The heater controls should pull off but check carefully first in case they are fixed in another way. Remove the ash tray and any other lockers or storage places (they may have screws behind them).Remove the surround embellishment by gently prizing it away from the fixing clips and then the framework which supports the structure. Remove all fixtures until the heater unit is accessible. unscrew the fan unit remove it and clean the whole assembly and the using a direct supply from the battery test run it. If it still runs slowly you may like to inspect and replace the brushes or the entire unit. ( they can be purchased from a breakers yard at reasonable costs) If it works fine from a direct connection, connect it in the vehicle via the circuit inside the vehicle and test again. If the fault reappears it would seem that you have a problem with bad earthing or the speed control switch. Make sure of the earth connection and then if required replace the switch. Re assemble and enjoy! Regards John

Posted on Feb 10, 2012

Testimonial: "Thanks John, I see that you are right about a fun job to tackle, it seems like I pretty much have to dissasemble the dashboard to get to the motor, a job I will do tomorrow. Again thanks for your instructions, Andrew"


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Sounds like a switch issue but also had some fan relay issues

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SOURCE: i have a 1999 Jeep Wrangler and the heater fan

If you bypass the resistor pack and connect the motor directly to the fused 12v supply then the fan should run at maximum speed. If so, it's the resistor pack that's blown: a very common fault on a huge number of makes and models.

Posted on Feb 13, 2010

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