GMC 1993 Jimmy Owner's Manual page 249

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a
9
KO721
8.
Then replace the pressure cap. Be sure the arrows on the pressure cap
line up like this.
Engine Fan Noise
This 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 every day
driving conditions the clutch
is not engaged. This improves fuel economy and
reduces fan noise. Under heavy vehicle loading, trailer towing andlor high
outside temperatures, the fan speed increases when the clutch 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 disengages.
If
a
Tim Goes Flat
It's unusual for a tire to "blowout" while you're driving, especially
if you
maintain your tires properly.
If air goes out of a tire, it's much more likely
to
leak out slowly.
But if
you should ever have a "blowout," here are a few tips
about what to expect and what
to do:
If
a front tire fails, the
flat
tire
will
create a drag that pulls the vehicle toward
that side. Take your foot
off the accelerator pedal and grip the steering wheel
firmly. Steer to maintain lane position, then gently brake to a stop well out
of
the traffic lane.

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