Heater fan not working

DRDUFF

MEMBER
1999 GMC SAFARI
163,000 MILES

1999 GMC Safari heater fan not working, wired directly to battery and fan runs (med. Low speed) my guess is the resistor prior to stopping seemed to be very low speed on all speeds except high I know location of resistor (under windshield washer) upon starting of vehicle defroster fan not working at all wired directly to battery and fan runs.

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4 Replies

FIXITMR

MECHANIC
9,990 POSTS

Have you checked fuses and wiring to fan?

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Friday, February 10th, 2012 AT 2:34 AM

DRDUFF

MEMBER
4 POSTS

All fuses & wires are good

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Friday, February 10th, 2012 AT 3:08 AM

FIXITMR

MECHANIC
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Does that have auto or manual temp control?

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Friday, February 10th, 2012 AT 4:36 AM

FIXITMR

MECHANIC
9,990 POSTS

Check hot wire to motor for juice. If no juice check fan relay. Also does relay engage when fan selects high. If juice present check ground wire to fan.

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Friday, February 10th, 2012 AT 5:13 AM