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.
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.
5-44
Содержание 2004 Sierra 1500 Pickup
Страница 5: ...These are some examples of symbols you may find on your vehicle v...
Страница 19: ...Put someone on it Get it up to speed Then stop the vehicle The rider doesn t stop 1 13...
Страница 55: ...In order to use the LATCH system in your vehicle you need a child restraint designed for that system 1 49...
Страница 83: ...United States with Passenger Sensing System United States without Passenger Sensing System 1 77...
Страница 167: ...NOTES 3 3...
Страница 168: ...Instrument Panel Overview 3 4...
Страница 202: ...Canada with Passenger Sensing System Canada without Passenger Sensing System 3 38...
Страница 296: ...NOTES 3 132...
Страница 400: ...NOTES 4 104...
Страница 412: ...Engine Compartment Overview When you lift up the hood on the VORTEC 4300 V6 engine you ll see the following 5 12...
Страница 416: ...When you lift up the hood on the VORTEC 8100 V8 engine you will see the following 5 16...
Страница 507: ...Front Position 2WD 1500 Series Rear Position 5 107...
Страница 530: ...5 130...
Страница 556: ...Maintenance Record cont d Date Odometer Reading Serviced By Maintenance I or Maintenance II Services Performed 6 20...
Страница 570: ...NOTES 7 14...