Chevrolet 2009 Silverado 1500 Pickup Spezifikationen PDF herunterladen (Seite 447)

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101

Overheated Engine Protection

Operating Mode

If an overheated engine condition exists and the

REDUCED ENGINE POWER message is displayed, an

overheat protection mode which alternates ﬁring

groups of cylinders helps prevent engine damage. In

this mode, you will notice a loss in power and engine

performance. This operating mode allows the vehicle to

be driven to a safe place in an emergency. Driving

extended miles (km) and/or towing a trailer in the

overheat protection mode should be avoided.

Notice: After driving in the overheated engine

protection operating mode, to avoid engine damage,

allow the engine to cool before attempting any

repair. The engine oil will be severely degraded.

Repair the cause of coolant loss, change the oil

and reset the oil life system. See Engine Oil

on page 5-15.

Engine Fan Noise

If the 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 the 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 the 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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