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Chevy Silverado
Heater Cores and Blower Fans

What could be the cause of a thumping sound from the blower fan under the dash in a 1992 silverado when you turn on the ignition it is electrical not the heater coil and is there a relay causing it?


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2006-08-10 01:14:53
2006-08-10 01:14:53

its the vent door. next time try hitting the switch for recycle/fresh air off and on. that may help.

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On my 2002 the ignition switch was hanging up causing a similar situation. A shot of WD40 into the key hole cleared it up, over a year ago.

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It is most likely caused by a rotor that is warped. When you step on the brake pedal, the brake pads pulse against the uneven surface, causing a "thumping" you can feel. Other possibilities could include a bad wheel bearing or a tire that has tread that is separating.

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This could be a loose exhaust bracket causing it to hit the underside on acceleration.


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