2003 GMC YUKON engine

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Page 384 of 520

GMC YUKON 2003  Owners Manual If Steam Is Coming From Your Engine
{CAUTION:
Steam from an overheated engine can burn
you badly, even if you just open the hood. Stay
away from the engine if you see or hear steam
coming from it. Jus

Page 385 of 520

GMC YUKON 2003  Owners Manual If No Steam Is Coming From Your
Engine
An overheat warning, along with a low coolant message,
can indicate a serious problem. SeeLow Coolant
underDIC Warnings and Messages on page 3-64.
If you get an

Page 386 of 520

GMC YUKON 2003  Owners Manual Cooling System
When you decide it’s safe to lift the hood, here’s what
you’ll see:
A. Coolant Surge Tank
B. Coolant Surge Tank Pressure Cap
C. Engine Fan
If the coolant inside the coolant surge

Page 387 of 520

GMC YUKON 2003  Owners Manual The coolant level should
be at or above the FULL
COLD mark. If it isn’t,
you may have a leak at the
pressure cap or in the
radiator hoses, heater
hoses, radiator, water
pump or somewhere else
in the

Page 388 of 520

GMC YUKON 2003  Owners Manual How to Add Coolant to the Coolant
Surge Tank
If you haven’t found a problem yet, check to see if coolant
is visible in the surge tank. If coolant is visible but the
coolant level isn’t at or above

Page 389 of 520

GMC YUKON 2003  Owners Manual {CAUTION:
Adding only plain water to your cooling
system can be dangerous. Plain water, or
some other liquid such as alcohol, can boil
before the proper coolant mixture will. Your
vehicle’s coolant

Page 390 of 520

GMC YUKON 2003  Owners Manual 4. Thenfill the coolant surge tank with the proper
mixture, to the FULL COLD mark.5. With the coolant surge tank pressure cap off, start
the engine and let it run until you can feel the upper
radiato

Page 391 of 520

GMC YUKON 2003  Owners Manual 6. Then replace the
pressure cap. Be sure
the pressure cap is
hand-tight and
fully seated.Engine Fan Noise
Your vehicle has a clutched engine cooling fan. When
the clutch is engaged, the fan spins fas