A/C Works Intermittently

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aschweitzer

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2004 GMC Yukon XL SLT - A/C blower not working right. Replaced blower motor resistor, worked for a short while. Replaced resistor again and same. Just replaced resistor and blower motor and worked for about two weeks. What is strange is that the blower motor doesn't work at all when I start the vehicle but will start working after driving for 5-10 minutes. It will only work on a low speed (automatic temp control) though and will cycle off and on every 5-10 minutes. This has got me stumped. Don't know where else to look other than replacing resistor and blower motor, which do not seem to be causing the problem.
 

magicbus

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maybe replacing the controls next? The controls in mine are pretty goofy, the knob for the driver side will sometimes go down when turning up and vice versa.
 
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