Question about 2003 GMC Sierra 1500

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2003 Chevy AC Fan Blower Motor troubleshooting

The A/C, heater, & vent fan does not blow. Does this mean it is the fan blower motor or some type of resistor is not working and needs to be replaced? If so how hard is it to fix?

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First check the fuse or relay.. this will be the cheapest sollution and easiest to check.

Posted on Jul 31, 2009

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This will help.Thanks.

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  2. The blower is actually working, but either the intake vent is plugged (I've seen vehicles with the heater core completely blocked by dirt, leaves and insects that came in through the vent), or the heater door is stuck closed.
  3. The motor bearings have gone bad (see # 1). This can cause the fuse to blow, although the resistor usually fries first.
I'm not sure how your car's cabin environmental control system is fused. Check any fuse that might apply, such as Vent/AC, HTR, FAN, etc. Generally you can identify the state of a blade-type fuse by inspection without removing it. If you have a blown fuse, check the blower motor before wasting money on a new fuse that will probably blow. Like any fan, it's supposed to turn easily, and there should not be any roughness or side-slop in the bearings.

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