![Chevrolet 2004 Silverado 1500 Pickup Owner'S Manual Download Page 435](http://html.mh-extra.com/html/chevrolet/2004-silverado-1500-pickup/2004-silverado-1500-pickup_owners-manual_2596958435.webp)
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 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.
5-43
Summary of Contents for 2004 Silverado 1500 Pickup
Page 5: ...These are some examples of symbols you may find on your vehicle v ...
Page 18: ...Put someone on it Get it up to speed Then stop the vehicle The rider doesn t stop 1 12 ...
Page 82: ...United States without Passenger Sensing System Canada with Passenger Sensing System 1 76 ...
Page 163: ... NOTES 3 3 ...
Page 164: ...Instrument Panel Overview 3 4 ...
Page 198: ...Canada with Passenger Sensing System Canada without Passenger Sensing System 3 38 ...
Page 408: ...When you lift up the hood on the VORTEC 8100 V8 engine you will see the following 5 16 ...
Page 485: ...Removing the Spare Tire and Tools Regular Cab and Crew Cab Extended Cab 5 93 ...
Page 518: ...5 126 ...