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Chevrolet Silverado 2007-2013: Why Won't My Blower Work?

Nothing is more upsetting than when you need your A/C or heater, and it just won't work. Continue reading to find out what is causing this issue.

By Jerry Perez - June 30, 2015

This article applies to the Chevrolet Silverado GMT900 (2007-2013).

You reach over to turn on your A/C or heater, you vive it a few minutes, and then you realize that nothing is happening. Or even worse, you are getting a hint of burnt rubber or even a little smoke coming through the vents. What could be causing this problem? The blower motor is supposed to blow air into the ducts, which is later cooled or heated by the appropriate system. There could be a couple of common reasons why this is happening. Here is the compiled list of reasons, but if the problem persists, visit your local dealer or professional repair shop.

Materials Needed

  • Flashlight (optional)
  • Voltmeter (optional)

Step 1 – Check the resistor module

It could be overheated.

There have been multiple reports of the blower motor resistor module overheating or melting, which would cause the blower motor to fail in your Silverado. Another common problem will be the blower motor will stick in the ON position and never shut off. You can access the resistor module behind the fuse box located on the driver's side lower dash compartment. You must visually inspect the resistor, and make sure it isn't melted or burnt. If it is, then replace it. If the problem persists, visit your dealer or repair shop.

Figure 1. Blower motor resistor module.

Pro Tip

It is imperative the resistor module is checked. This problem has been reported to cause fires under the hood.

If the result of this process doesn't fix the problem, move forward to the next step.

Step 2 – Check the switch selector

It could be faulty.

Fan selector switches can go bad just like a window switch or a door lock switch, which means that even though the rest of the system is working as it should, the switch isn't triggering the right action. You can check behind the dash and inspect that the contact points of the switch aren't dirty, damaged, or shot. If they are, you can replace them and try the system again. You can also inspect the wiring to make sure it is in good condition.

Figure 2. Silverado dual temperature switch selector.

Pro Tip

If your truck is equipped with the dual climate feature, your switch will consist of a different resistor and not a fuse.

If that process doesn't fix the issue, move forward to the next step.

Step 3 – Check the blower motor

It could be dead.

Once you've inspected the switches as well as the resistor, there could only be one more reason why the blower motor isn't working an that is the actual blower motor has failed. Head under the hood and check the blower motor wiring to make sure it is getting power to it. If it is, then your only option is to remove the blower motor and have it tested or replaced. You can do so yourself if you have the equipment, or have it done at the dealership or parts store.

Figure 3. Silverado blower motor and fan assembly.

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