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98 GMC Z71: Where are the blower resistor and high blower relay? I checked behind glove box and they are not there. I have power out of the control module and no power at the blower motor.
Re: 98 GMC Z71: Where are the blower resistor and high...
They are there. They are hard to get to. What is the complaint? Have you checked the fuse? Blower fuse (50 amp) under the hood.HTR-AC fuse (25 amp) in the instrument panel fuse box
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Either you have defective blower motor or a defective blower motor resistor module. The resistor module has been known to fail on these trucks. Both items are located behind the glove box.
remove glove box, look on top of heater box in recessed portion. You will see a muti-wire plug facing up. This is the blower resistor. Check for burnt connections by removing plug (common problem). Blower high speed relay located above blower motor (also behind glove box). Check for burnt connections. Repair harness available through G.M. dealer.
The GM trucks do not use vacuum to operate the HVAC system. Check for power at the purple wire at the blower motor. If you have power and the blower motor is still inop, replace the blower motor. If you have no power, check the relays and resistor behind the glove box. Four screws hold the glove box in place.
Most likely cause is the blower motor resistor. If you remove the glove box (4 screws, two on each side), the resistor is located behind the 4 relays. Two screws hold it in place. rmeove screws and pull it up and out of the HVAC case.
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