This instruction will step by step show you guide on how to replace cabin air filter for GMC and Chevrolet trucks(1999-2002).
Here is another article about Cabin Air Filter, attach link here for your reference: How To Replace Cabin/Air Condition for Any Car.
Use a 7mm socket to unscrew 3 bolts from tray
Pull down the tray
Use a 7/32 socket to unscrew a gold bolt on the plastic strip which is a cover for cabin air filter
Push the plastic strip off , then take out two filters
Clean the area where is need to be installed new filters. Then install new filters.
Make sure the arrow should be pointed towards the driver’s side for both filters.
After installation, put everything back, replacement is finished.
More cases about GM, please refer to GM Vehicle Repair Cases.