2003 Chevy Silverado blower fan

2003 CHEVROLET SILVERADO
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ROB3
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Heater problem
2003 Chevy Silverado Four Wheel Drive Automatic 105,00 miles
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Yesterday I went to start the P/U. Battery was dead.
Replaced the battery and it started right away.

I now noticed that I couldn't raise or lower the blower speed. It was stuck in high speed. The control button showed that it went up faster or slower. But there was no actual change in fan speed. Turned the P/U off and the fan continued on high speed.

Pulled the 40 amp fuse and the fan stopped.

Any ideas?
Thanks
Apr 21, 2008 at 4:17 AM
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RHALL77
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did it stay on all the time even with the key off? doea it have automatic controls? if yes you may need to have it scanned for codes.
Apr 23, 2008 at 12:23 AM
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ROB3
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[quote:0e4fba4c74="rhall77"]did it stay on all the time even with the key off? doea it have automatic controls? if yes you may need to have it scanned for codes.[/quote:0e4fba4c74]

With the key off and ever tihng else, it continued to blow on Hi. Keys out of the ignition. Gone to help the wife with her shopping.
Apr 23, 2008 at 10:56 AM
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RHALL77
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un plug the blower motor resistor and see if it shuts off. may be a shorted resistor.
Apr 24, 2008 at 3:17 AM
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ROB3
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[quote:a9746baecf="rhall77"]un plug the blower motor resistor and see if it shuts off. may be a shorted resistor.[/quote:a9746baecf]

Where is the resistor located?
Apr 24, 2008 at 4:52 AM
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RHALL77
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down by the heater box on the passenger floor. it has 4 to 6 wires on it by the blower motor. see if the plug is burned or not.
Apr 24, 2008 at 4:54 AM
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