Chevrolet Silverado 4500HD 2022 Manual page 278

Air Restriction Gauge
The air restriction gauge indicates how much
engine air cleaner filter capacity has been
used and how much filter capacity remains.
It measures maximum restriction of the
filter element when the engine is operating
at full load, and locks at that point. This
feature allows you to read the maximum
restriction with the engine off.
The gauge is mounted just behind the
engine air cleaner and is visible on the
passenger side of the engine compartment.
Do not reset the gauge until the engine air
cleaner/filter has been changed and it has
been determined that the air cleaner service
is required.
If the gauge is in the red zone, replace the
air cleaner/filter and then reset the gauge
by twisting the black knob until the gauge
is in the green zone.
When to Inspect the Engine Air Cleaner/Filter
For intervals on changing and inspecting the
engine air filter, see Maintenance Schedule
0 330.
How to Inspect the Engine Air Cleaner/Filter
Do not start the engine or have the engine
running with the engine air cleaner/filter
housing open. Before removing the engine
air cleaner/filter, make sure that the engine
air cleaner/filter housing and nearby
components are free of dirt and debris. Do
not clean the engine air cleaner/filter
components with water or compressed air.
When changing the air filter, remove the
dust valve from the front intake air duct and
clean out any debris if necessary.
Caution
Water sprayed into or on the air intake
box in the engine compartment may
damage the air filter or electrical
components. Do not spray water into or
on the air intake box.
Vehicle Care
To inspect and replace the filter:
1. Tilt the hood open. See Hood 0 269.
2. Remove the four screws from the
housing cover.
3. Raise the housing cover. Take care not to
move the air cleaner/filter housing base,
to avoid any air leaks.
4. Remove the air cleaner/filter from the
housing base. Take care to dislodge as
little dirt as possible.
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