GMC 2008 Chevrolet Tahoe Supplemental Owner's Manual page 43

When you decide it is safe to lift the hood, here is what
you will see:
A. DMCM Coolant Tank
Pressure Cap
B. DMCM Cooling
Hoses (Out of View)
C. DMCM Coolant
Surge Tank/Engine
Coolant Surge Tank
If the coolant inside the DMCM coolant surge tank is
boiling, do not do anything else until it cools down.
D. Engine Coolant Surge
Tank Pressure Cap
E. Drive Motor/
Generator Control
Module (DMCM)
The coolant level should be at or above the FULL
COLD mark with the vehicle parked on a level surface.
If it is not, you may have 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.
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