Question about 1999 Chevrolet Suburban

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Intermittent blower speeds

My front a/c blower does not respond correctly to the setting knob. It will run slow, then fast, then slow again. When I turn up the speed, it takes a few seconds for the blower to go faster, but then it will blow different speeds randomly.

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  • Chevrolet Master
  • 6,826 Answers

Pull motor ,check for burned wires onfan and bak of fan speed switch,fan could be the problem un hook fan and conect directley to 12 volts and see if varibles exsist,if so replace fan motor/look for a fan resister if all the other things check out

Posted on Jul 03, 2009

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1.Check the power and ground connections on your blower motor, corrosion can cause high resistance and a slow blower speed.

2. Check your available voltage at the blower motor on the different settings. it should vary with high supplying 12volts, make sure to do this check with the blower motor still plugged in.

3. Connect the blower to a 12v power source and see if it runs at high speed.

If all else fails i would check your resistor pack, i would not suspect this because when it fails you usually just loose all speeds except for high, but it could happen.

Feb 25, 2009 | 1999 Chevrolet Silverado 1500

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