Checking Coolant - GMC 2003 GMT560 T-Series Owner's Manual

Checking Coolant

The coolant surge tank pressure cap can be accessed
without tilting the cab.
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CAUTION:
Turning the surge tank pressure cap when the
engine and radiator are hot can allow steam
and scalding liquids to blow out and burn
you badly. Never turn the surge tank pressure
cap — even a little — when the engine and
radiator are hot.
The vehicle must be on a level surface. When your
engine is cold, the coolant level should be at the COLD
FILL mark or higher.
See Low Coolant Warning Light on page 3-30 for further
information.
If the low coolant light
comes on and stays on, it
means you're low on
engine coolant.
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