Question about 2001 GMC Sierra Crew Cab
Try changing both of the cabin air filters (under glove box). Remove the insulation panel around the heater (4 screws) and the the door to the filter (1 screw). You will see the first filter, pull it straight down. The second filter is further towards the firewall/engine beside the first filter. You need to grab it, pull it towards you, and drop it down where the first one came out.
Worked great for me! Old filters were so plugged you couldn't see through them. Nobody will tell you they are in there. Filters were $20 (for both) at Napa.
Posted on Mar 25, 2009
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