Question about 2006 Chevrolet Silverado 1500HD

3 Answers

I have a 2006 Cevy Silverado 1500. The fan is on high on my air conditioner, but it does not blow out air. All I get is the outside air, when the car is moving, which can be cooled when I have the temperature turned down, but the fan is not working, and the system wants to keep on turning to recirculate.

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  • Rosalinda Rodrigues Jul 04, 2010

    I have a 2006 Cevy Silverado 1500. The fan is on high on my air conditioner, but it does not blow out air. All I get is the outside air, when the car is moving, which can be cooled when I have the temperature turned down, but the fan is not working, and the system wants to keep on turning to recirculate.

  • Rosalinda Rodrigues Jul 04, 2010

    How can I tell if it is the module or the fan?

  • Rosalinda Rodrigues Jul 04, 2010

    Thank you so much for the DETAILED information. We will try each step and hope it works. We will let you know.

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  • Master
  • 6,784 Answers

HI. It is a simple procedure to isolate this issue. I suspect the fan, but to be sure, simply extract the blower and jump the terminals with a jumper wire, or you can use a 9 volt battery to confirm that the fan is functional. If the fan runs, when jumped(isolated power source attached to it), this will confirm that the fan is ok and the module has failed.

Concerning the module:

Gain access to the fuse box that contains the blower motor fuse and check this fuse for its operational value. If the fuse has failed, such as having broken filament or corroded connecting points, replace it and try the heater/air conditioner again. If the fuse is ok, move on to the next step. Turn on the ignition switch and turn the AC control to maximum cooling. Using the voltmeter probe to test the voltage on the wire going into the blower motor control module. If the voltage is 0 or very low, the problem is occurring before the module. If the voltage is up to specs (12V), move on to the next step.


Using the voltmeter probe once again, test the voltage at the connectors to the blower motor. If the voltage is 0 or very low, the blower motor control module is suspect. If the voltage is up to spec at the blower motor connectors, around (12V), the module will be fine, but the blower motor has failed.


  • When testing the module, be sure to have everything connected so that you can have proper voltage readings.

Posted on Jul 04, 2010

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  • Chevrolet Master
  • 11,800 Answers

The fan isn't turning because either (most likely) it's defective and must be replaced or it doesn't get power (either there's a brake in the cabling sending the power to it or the aircon controls are faulty). The only way to know which is to dismantle the dash and test everything. It's a long and delicate job that should be left to a pro. If you want to do it yourself then buy a repair manual like 
http://www.haynes.com/products/productID/245
and follow it to the letter.
The system wants to recirculate because this is the recommended way of using the aircon - using the air intake the temperature will never reach the desired one and the compressor will be always at full power, wearing it down a lot faster.

Posted on Jul 04, 2010

  • Azrael SRL Jul 04, 2010

    Access the fan and power it directly from the battery: if the fan starts then the problem is in the module.


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Check the A/C fuse located underneath the drivers side steering wheel in the fuse box. Replace the burned out fuse. If the fuse is good then you will need to replace the blower motor

Posted on Jul 04, 2010

  • Anonymous Jul 04, 2010

    Did you check the fuse?

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I have a 2006 Cevy Silverado 1500. The fan is on high on my air conditioner, but it does not blow out air. All I get is the outside air, when the car is moving, which can be cooled when I have the...


The module for the fan may be bad. It's like a relay. Or the fan itself is worn out and needs replaced.

sometimes changing the fan first is desirable and economical. If this doesn't solve the problem, go for a relay.

It stands to reason that things that move will wear out first.

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Thank you,
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