Cooling System - GMC 2015 Sierra Owner's Manual

10-20 Vehicle Care
3. Disconnect the electrical
connectors (2) and the
connector harness from the
cover.
4. Remove the four screws (1) on
top of the cover of the housing
and lift up the cover.
5. Remove the engine air cleaner/
filter from the housing. Take care
to dislodge as little dirt as
possible.
6. Clean the engine air cleaner/
filter sealing surfaces and the
housing.
7. Inspect or replace the engine air
cleaner/filter.
8. Reverse Steps 2 4 to reinstall
the filter cover housing.
Warning
Operating the engine with the air
cleaner/filter off can cause you or
others to be burned. The air
Warning (Continued)
cleaner not only cleans the air; it
helps to stop flames if the engine
backfires. Use caution when
working on the engine and do not
drive with the air cleaner/filter off.
If the air cleaner/filter is off, dirt
can easily get into the engine,
which could damage it. Always
have the air cleaner/filter in place
when you are driving.

Cooling System

If the vehicle has the Duramax
diesel engine, see the Duramax
diesel supplement.
The cooling system allows the
engine to maintain the correct
working temperature.
(Continued)
Caution
5.3L V8 Engine Shown, 4.3L
V6 Engine and 6.2L V8 Engine
Similar
1. Coolant Surge Tank
2. Coolant Surge Tank
Pressure Cap
3. Engine Electric Cooling Fans
Warning
An electric engine cooling fan can
start even when the engine is not
running. To avoid injury, always
(Continued)