Black plate (10,1)
Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2012
10-10
Vehicle Care
When it is safe to lift the hood:
A. Drive Motor/Generator Control
Module (DMCM)
B. Engine Coolant Surge Tank
Pressure Cap
C. DMCM Coolant Surge
Tank/Engine Coolant
Surge Tank
D. DMCM Cooling Hoses
(Out of View)
E. DMCM Coolant Surge Tank
Pressure Cap
If the coolant inside the DMCM
coolant surge tank is boiling, do not
do anything else until it cools down.
The coolant level should be at or
above the FULL COLD mark with
the vehicle parked on a level
surface. If it is not, there might be a
leak at the DMCM cooler core,
DMCM pressure cap, DMCM cooler
hoses, DMCM cooling pump or
somewhere else in the DMCM
cooling system.
Notice:
Running the engine when
there is a leak in the hybrid
cooling system can cause the
hybrid cooling system to lose all
coolant and can damage the
system. Get any leak fixed before
you drive the vehicle or run the
engine.
How to Add Coolant to the
DMCM Coolant Surge Tank
If no problem has been found yet,
check to see if coolant is visible in
the DMCM coolant surge tank.
If coolant is visible, add pre
‐
mixed
DEX-COOL coolant, available at
your dealer, at the DMCM coolant
surge tank, but be sure the DMCM
cooling system, including the DMCM
coolant surge tank pressure cap,
is cool before you do it. Use the
procedure following.
