Question about Pontiac Cars & Trucks
Heater fan does not work, but sometimes runs very slow than stops
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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Posted on Jan 02, 2017
they have a problem with the forward lighting harness. Where the harness runs by the washer fluid tank there are 3 splice packs and they rott out all the time. You may have to remove the connector from under the body and the washer tank to gain access.
Posted on Dec 15, 2009
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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