GMC Chevrolet Silverado 2500HD 2021 Owner's Manual page 206

2. Push the dampener arm to the left until
it releases the glovebox.
3. Press the sides of the glove box door
inward and rotate the door downward to
remove.
4. Pull lever on left side of the filter door
and slide left, then remove the door.
Remove the old filter.
5. Install the new air filter.
6. Reinstall the filter door.
7. Reverse the steps to reinstall the
glove box.
See your dealer if additional assistance is
needed.
Climate Controls
Service
All vehicles have a label underhood that
identifies the refrigerant used in the vehicle.
The refrigerant system should only be
serviced by trained and certified technicians.
The air conditioning evaporator should never
be repaired or replaced by one from a
salvage vehicle. It should only be replaced
by a new evaporator to ensure proper and
safe operation.
During service, all refrigerants should be
reclaimed with proper equipment. Venting
refrigerants directly to the atmosphere is
harmful to the environment and may also
create unsafe conditions based on
inhalation, combustion, frostbite, or other
health-based concerns.
The air conditioning system requires periodic
maintenance. See Maintenance Schedule
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