GMC 2004 Canyon - Manual (Page 291)

Checking Coolant
The coolant recovery tank is located toward the rear of
the engine compartment on the passenger’s side.
See Engine Compartment Overview on page 5-12 for
more information on location.
The vehicle must be on a level surface. When your
engine is cold, the coolant level should be at FULL
COLD, or a little higher. When your engine is warm,
the level should be above the FULL COLD level.
Adding Coolant
If you need more coolant, add the proper DEX-COOL ®
coolant mixture at the coolant recovery tank.
{ CAUTION:
Turning the radiator pressure cap when the
engine and radiator are hot can allow steam
and scalding liquids to blow out and burn you
badly. With the coolant recovery tank, you will
almost never have to add coolant at the
radiator. Never turn the radiator pressure
cap — even a little — when the engine and
radiator are hot.
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