PS Magazine - TB 43-PS-564
PS, The Preventative Maintenance Monthly
ISSUE 564
NOVEMBER 1999
PS 564
11
NOV 99
Cardboard deflects hot air from cold glass
blast of hot air from a
HMMWV defroster can crack a
cold, frosty windshield.
One solution is to let the wind-
shield warm up as the cab warms
up before you direct hot air to it.
That works well enough, but it
slows down your ability to start
and go when you need to.
A “quicker” solution is to put a
temporary shield of cardboard or
plastic across the bottom of the
windshield to prevent most cracks
Trucks . . .
Stop Air Line Freeze-up
D
rivers, moisture in your truck’s air brake lines will freeze in cold weather and
block the lines. That leaves you without brakes.
If your vehicle has an alcohol evaporator to keep moisture out of the air lines,
make sure it has the alcohol it needs to do the job. NSN 6810-00-597-3608 gets
one gallon of methyl alcohol. NSN 6810-00-275-6010 gets a 5-gal can.
HMMWV . . .
caused by hot air blowing on cold glass.
Once the windshield is clear, remove the
shield and move out.
Having that “edge” may be enough to get
you moving sooner.
Overcharging
Overcharging is the culprit when the
needle hangs in the red section on the
right side of the gauge.
Overcharging means water will boil
out of the batteries and the plates in-
side can be damaged. Another clue to
overcharging is a battery that often
needs water.
If the gauge shows a high rate of
charge after the engine’s been running
for 30 minutes, there’s a good chance
the battery’s being cooked to death.
Undercharging
Undercharging is the villain when
the needle settles well below that 28.5
volt mark, even though it’s still in the
green.
Green: 26–30 volts
Red: 30–34 volts
This is OVERCHARGING
10
OVER-
CHARGING!
THAT
BURNS ME UP
!
UNDER-
CHARGING?
NO
WONDER I FEEL
RUN DOWN
.
HAVE
ANY
OF THESE
PROBLEMS
? GET YOUR
MECHANIC TO CHECK OUT
THE
CHARGING
SYSTEM
.
HUH?
WHAT
HAPPENED?
I
DIDN'T
EVEN
TOUCH
THE
GLASS
!
BUT THE
HOT AIR
FROM
YOUR
DEFROSTER
DID!
This is UNDERCHARGING
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