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The 99 - 02 800 series uses a resistor to adjust blower motor speeds. On my vehicle the blower only runs on 4 and 5. The part number on the installed resistor is: 15305077 The latest GM part number is 89019089 (it was 898018597) and cost $47.46 including tax from the GM dealer. Aftermarket about $20 from parts store. The resistor is on the passenger side hidden by a formed plastic kick panel which attaches by 3 hex head screws. The size is 8mm and a deep socket is recommended for one screw in a rather annoying location. This one resides in a deep cavity opposite of the tranny hump. Once the cover is off, the resistor is easy to spot on the right side of the heater/AC box. Has a multiwire connector going in and on the back side two wires out to the blower motor. The screws on 99 and 01 are 7/32" and gold shaded. To get at the blower motor connection one has to remove the blower motor shield. And of course one of the two screws is in a blind location right next to the firewall. Both screws are again 7/32". I found that one could take off just the front screw and with a long thin blade screwdriver disengage the snap lock on the blower motor electrical connector.

2006-11-22 02:43:08
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