It's under the dash on the passenger side, remove the panel on the bottom of the dash, and its behind the blower motor. Takes about 20 min to get the job done and the parts can be bought at Auto Zone and there's step by step instructions top get the job done, don't for get the new wire harness also to go with the resistor. There also common to go bad, due to the heat from the current flow makes them brittle.
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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".
It will be a blower resister module,it should be very close to the blower motor mounted on the blower box,where it can insert into the blower box and keep cool.
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