Question about 1999 Chevrolet Silverado 1500

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Heater blower only blows on low

I hane a 1998 chevy silerado z71, my heater is putting out good heat but the fan is only blowing on low no matter where i set the knob. Any ideas???

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Check the resistor block in the heat duct. It controls the fan speeds. There will be a small frmoveable piece in the duct with 2 or 3 wires going to it. They go to different combinations within the resistor plate to make the motor run at different speeds.

Posted on Feb 25, 2009

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This could be a few different things:

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.

Posted on Feb 25, 2009

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