Question about Chevrolet Blazer

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I have a 91 Blazer that keeps blowing fuses for the heater blower motor. When I replace the fuse and turn the fan on it will work for about 4 or 5 minutes and then blow a fuse. does this sound like I need to replace the blower motor? If so how do i get it out and replaced?

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Hello. Yes it sounds like the motor is shot. These are difficult to replace. I recommend going to an autobody shop to have the motor replaced. See what the price is on a rebuilt motor at an auto parts store and then see what the auto body shop will charge you to install it. Joe

Posted on Oct 15, 2010

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  • Chevrolet Master
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This does sound like a blower motor issue, likely bearings, has it been screeching, that you can remember? The motor comes out the front, usually, look on the passenger side firewall area. When you get a new one, try for one with a blower cage included. Old fans are often out of balance.

Posted on Oct 15, 2010

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Heater fan works for a while then cuts off till it cools down




What can go wrong with a blower motor?
There are several things that may cause your blower motor to stop working. The simplest cause would be a blown fuse. If you replace the fuse and it quickly blows again, then you probably have an electrical short. Disconnected wires on the exterior of the blower motor can also cause it stop working, and if your blower motor gets dirty, it can get clogged or muddy which keeps the fan blades from spinning.

How do I test my blower motor?
When you are troubleshooting your blower motor, it is best to start by running the air conditioning or the heater to see if you can hear the sound of the fan. If you can hear the fan, it could be clogged or corroded with dirt. If you do not hear the fan, then you may have a bad resistor, blown fuse, or a loose wire. Next, you should replace any blown fuses in your car's fuse panel and try to start the blower motor again. If another fuse blows right away, you have an electrical short. If it doesn't blow out and the motor is still silent, then something else is wrong. In the case where the fuse lasts for a little while as the fan spins but then the fuse blows again, that usually means you need to replace the brushes on the motor. Finally, you can pull the motor out and visually inspect it for loose wires. If you don't see any and still want to test, try hooking it up to the battery to see if the motor will start. If all these tests still find you with a dead blower motor, it's definitely time to replace it.

How do I replace it?
Usually located under your vehicle's instrument panel, the blower motor can be removed and replaced. You'll need to disconnect the blower motor connector and remove the retaining screws holding it into place. Detach the fan retainer clip from the motor shaft that's located in the center of the blower wheel. You may need to save that piece if you are not replacing the whole motor. Inspect your new motor to ensure nothing is broken and the blades can properly spin. Re-attach the fan retainer clip, the retaining screws, and the connector so you can test your new blower motor out.

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