Hummer 2008 H2 User Manual download pdf (Page 369)

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5. With the coolant surge tank pressure cap off, start

the engine and let it run until you can feel the upper

radiator hose getting hot. Watch out for the engine

cooling fan.

By this time, the coolant level inside the coolant

surge tank may be lower. If the level is lower, add

more of the proper mixture to the coolant surge tank

until the level reaches the FULL COLD mark.

6. Then replace the pressure cap. Be sure the

pressure cap is hand-tight and fully seated.

7. Verify coolant level after engine is shut off and the

coolant is cold. If necessary, repeat coolant ﬁll

procedure steps 1 through 7.

Engine Fan Noise

If your vehicle has a clutched engine cooling fan, when

the clutch is engaged, the fan spins faster to provide

more air to cool the engine. In most everyday driving

conditions, the fan is spinning slower and the clutch is

not fully engaged. This improves fuel economy and

reduces fan noise. Under heavy vehicle loading, trailer

towing, and/or high outside temperatures, the fan

speed increases as the clutch more fully engages, so

you may hear an increase in fan noise. This is normal

and should not be mistaken as the transmission slipping

or making extra shifts. It is merely the cooling system

functioning properly. The fan will slow down when

additional cooling is not required and the clutch

disengages.

You may also hear this fan noise when you start the

engine. It will go away as the fan clutch partially

disengages.

If your vehicle has electric cooling fans, you may hear

the fans spinning at low speed during most everyday

driving. The fans may turn off if no cooling is required.

Under heavy vehicle loading, trailer towing, and/or

high outside temperatures, or if you are operating your

air conditioning system, the fans may change to

high speed and you may hear an increase in fan noise.

This is normal and indicates that the cooling system

is functioning properly. The fans will change to low

speed when additional cooling is no longer required.

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Hummer 2008 H2 User Manual Page 369

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