just bought a 1991 firebird today and the power windows do not work.
the passenger window will go down about an inch and stops. all fuses
ok. this car has been sitting outside for 2 years without the windows
being put up or down. any help is appreciated its 90 degrees and the
ac does not work.
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First test the window motors installed. They use a moving ground
system. power on one side ground on the other is raise. Reverse them and
you get lower.
If the motors operate chech that the switches are operating properly.
If they are, remove the clips holding the wiring flex shields in place
and check for broken wires between the main body and the doors, in the
doors and in the kick paniels.
Charles, are you sure about that? All the GM power window motors I've worked
on grounded through the body and you just powered either terminal to move the
window up or down.
The JAP $hit I've worked on works like you said. You touch the ground and
positive on the two terminals or reverse to move the window the other way.
When I touched the two terminals on a GM power window motor I turned the
battery charger into a welder! :-)
first gen S-10's, 85 to 2000 Astro Vans, and 93 to 2002 F-cars.
The 93 to 2002 F-cars use the same window motor that a 85 to 2000 Astro
van does. These motors have ground wires, that go from the master
(drivers switch) to the passengers switch. 90% of the time when they
have a issue of being IN-OP, it is a wire problem. The wires break, or
the insulation peals back, or just splits.
I can't recall if the 82 to 92 F-cars use a ground wire or ground to
the body. A Factory Service Manuial will tell that.
Sounds like the window action (mechanical) is "stove-up" from sitting. The
electrical schematic I have for my '88 model shows the switch connects one
motor wire to power and the other to ground alternately to reverse it. Since
the passenger window moves some I would rule out electrical problem atleast
for that side. Freeing up the window in its track and lubing the action of
the register that moves the window should fix that side and may give a tip
about the other side. It may be just too stiff for the motor to move. I
recommend Permatex "chain lube" for pivot points.
Then get ambitious and fix that A/C!
p.s. Charles, what do you use to lube the track that the glass slides in?
Andy he could still have a wiring problem. Especially if the circuit
braker is triping (that what the large metal fuses are).
If something in a door is binding I start with WD-40 or PB-Blaster.
Once broken free, I use spray or brush on white lithium grease. The
brush on stuff is perdy thick. The spray on stuff is great for getting
in to the nooks and crannys, as it is thinner. I also have white lithium
grease in about a medium weight. Labeled as "Assembly Lube" that fills
the weight gap. All great stuff to keep around the shop or home garage.
I use white lithium grease on my door hindges in my home & my cabinate
hinges when they start creeking.
AC Delco power window motors suck! I'm on my 3rd drivers side, although
the passenger side IS original...less use! Anyone ever check out the
ebay auctions for window motors? I've noticed a seller claiming he sells
"new" motors for fbody's as low as $13.99? Too good to be true?
Considering 85 to 2000 Astro window motors are the same exact part. I
put 330,000 miles on a 87 Astro with the orginal window motors. I Drive
with the windows down (A/C is for kids and old folks), even in the
winter I crack my windows.
If your on your thrid set of motors I would look for the cause of the
failure. These motors don't burn out very often.
If the later model motors burn out very often, knowing that the motor
is the same on Astrovans from 1985 to 2000 That is what I would replace
with. Very Few Astro's need window motors, mostly the wires are the cause.
Charles, I've noticed something about the power windows on my cars. Some
windows tend to tilt slightly forward or backward when first moving. I'm
thinking the track adjustment causes or relieves the power requirements for
the window movement. 4th gen camaros are notorious for window motor
replacement. As you know, these windows are among the biggest in the
industry. I think an Astro van's window is considerably smaller front to
back and the potential for bindingl is less and not as severe when it
happens. I know that you're the man when it comes to auto repair but this is
my thought on *one* reason that the astro van has fewer problems using the
Actually the OES motors are considered much better than the Chinese
replacements. If you're searching ebay, you may notice that you can buy
these cheap motors under $20 and there are also $40 replacements. The $40
motors are original equipment supplier units. One vendor explains that his
Chinese motors are intended as a quick fix but sells the OES versions with a
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