Chevrolet 2006 Express Van Owner's Manual page 278

Checking Coolant for Gasoline Engines
If your vehicle has a diesel engine, see "Checking
Coolant" under "Van Models" in the DURAMAX
Diesel Supplement for information on checking your
vehicle's coolant.
The vehicle must be on a level surface. When your
engine is cold, the coolant level should be at the
COLD FILL mark, or a little higher.
5-24
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The coolant recovery tank
is located near the center of
the engine compartment.
See Engine Compartment
Overview on page 5-12 for
more information on
location.
Adding Coolant
If you need more coolant, add the proper DEX-COOL
coolant mixture at the coolant recovery tank, but be
careful not to spill it.
CAUTION:
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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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