Mechanics

CHEVY FAN

2001 Chevrolet Silverado

Heater problem
2001 Chevy Silverado V8 Two Wheel Drive Automatic 60000 miles

The blower for the heating/air conditioning fan does not work on speeds 1 and 2. It only works on settings 3, 4 and 5. I've pulled the switch and checked the wiring hraness and haven't found any obvious cause. Should I buy a new switch and hope that solves the problem?

Thank you for the prompt replies. I could check the voltage if I had a clue how to go about it, but I must admit that isn't something I'm familiar with. A co-worker suggested the resistor as well, however, I'm having trouble locating it. Any help with either of these dilemmas would be appreciated.
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Rjou319
November 13, 2009.



On the heater box under the hood there is a blower motor switch, that was the problem with mine

Tiny
Shovelhead jimmy
Nov 13, 2009.


http://www.2carpros.com/forum/automotive_pictures/170934_silverado_heater_1.jpg



Welcome to the forum, I'd check voltage on the circuits at different speeds. If voltage is ok, I suspect the resistor assembly.

JDL
Nov 13, 2009.
Probably should have posted follow-up here. I'm not real clear on how to measure the voltage, but a co-worked mentioned the resistor assembly as well. I'm having a little trouble locating it though. Any help on either problems would be appreciated.

Tiny
Rjou319
Nov 19, 2009.
You can use a testlite on the wires for the blower speeds. In the diagram you have one wiring color for each speed, take the connector loose from resistor assembly. key on, havc turned on, switch through the speeds, while you use a testlite at the proper wiring color at connector. If everything is hot, probably ok up to that point.


http://www.2carpros.com/forum/automotive_pictures/170934_silverado_blower_resistor_1.jpg



The resistor assembly is under passenger side of dash, number 5 in the picture.

JDL
Nov 20, 2009.