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Air Conditioning Blower Control Module

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Air Conditioning Blower Control Module

Repair common AC blower control module problems. Drivers and car owners of some popular Chevrolet trucks and utility vehicles are having issues with intermittent interior fan operation.

In fact, I had one situation where the blower fan got stuck on high even when you turned off the ignition key. However, it seems like the most common complaint is that the fan doesn 't respond to speed adjustments or doesn 't work at all.

Some of the more popular vehicles included in this issue are the Chevrolet Silverado pickups, Trailblazer, Suburban and Tahoe sport utility vehicles. Of course, this applies to the GMC version of these vehicles like the Envoy and Yukon. The model years with the most problems are …show more content…

This is the digital type set up that function like the HVAC control panel in your house. You set the temperature for 70 degrees and the climate control system automatically adjusts the temperature doors and blower speed to accommodate your settings.

If your vehicle has the base option set up with two dials and slides to select a temperature range between cold and hot, you do not have a blower module. Instead you have a blower resistor.

Nevertheless, both of these systems are troublesome and might need their respective parts replaced. It 's just important to make sure you know the difference and what parts are on your automobile.

Diagnosing a Defective Blower Control Module

On the automobiles we 're discussing you access the blower module from the passenger side foot well. On vehicles with high-level trim there might be a hush panel to remove to gain access.

Another thing to take note of is that on most of these models the glove box will swing out of the way when you push up on the stop tab in the upper left corner of the glove box compartment. When this swings out of the way you have an excellent view of the blower motor and its two wire connector.

Although you probably have a bad blower module you still want to take a few basic tests before you purchase the replacement parts. You want to check the fuses to make sure that they are not blown. If they are blown it could be yet another sign that the module is drawing too much current.

The next step is to

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