Slow windows
Burning Brakes
Joined: Mar 2016
Posts: 1,014
Likes: 85
From: socal
I want to chime in here bc I too have a slow window (driver side). It will not go up sometimes on the first press and recently it got stuck, had to "spot" the motor and helped it close the window w/ by pushing it myself upward.
I checked the service records and it shows repeating problems
Left (assuming driver side) motor power connector repaired - 60k miles
Left motor replaced - 79k miles
Left motor replaced - 93k miles (car has 94 right now)
Maybe I have the sides reversed and that was all passenger motor work done? Is that common to have to have had a C4 window motor replaced twice under 100k miles? Thanks
I checked the service records and it shows repeating problems
Left (assuming driver side) motor power connector repaired - 60k miles
Left motor replaced - 79k miles
Left motor replaced - 93k miles (car has 94 right now)
Maybe I have the sides reversed and that was all passenger motor work done? Is that common to have to have had a C4 window motor replaced twice under 100k miles? Thanks
Race Director
Joined: Mar 2015
Posts: 15,926
Likes: 579
I want to chime in here bc I too have a slow window (driver side). It will not go up sometimes on the first press and recently it got stuck, had to "spot" the motor and helped it close the window w/ by pushing it myself upward.
I checked the service records and it shows repeating problems
Left (assuming driver side) motor power connector repaired - 60k miles
Left motor replaced - 79k miles
Left motor replaced - 93k miles (car has 94 right now)
Maybe I have the sides reversed and that was all passenger motor work done? Is that common to have to have had a C4 window motor replaced twice under 100k miles? Thanks
I checked the service records and it shows repeating problems
Left (assuming driver side) motor power connector repaired - 60k miles
Left motor replaced - 79k miles
Left motor replaced - 93k miles (car has 94 right now)
Maybe I have the sides reversed and that was all passenger motor work done? Is that common to have to have had a C4 window motor replaced twice under 100k miles? Thanks
My 94 has a bit over a 100k and both original.
Last edited by antfarmer2; May 17, 2016 at 08:46 PM.
Melting Slicks
Joined: Jan 2001
Posts: 2,996
Likes: 304
From: MOORESVILLE NC
You can use WD40 on the metal coil spring. Use CRC Di-electrical grease, Lithium grease, or synthetic grease on the rollers and the shafts they move in.
Pull the door panels off being careful with the power door lock connections.
The old grease hardens over time with heat.
Pull the door panels off being careful with the power door lock connections.
The old grease hardens over time with heat.
Racer
Joined: Apr 2012
Posts: 461
Likes: 20
Drifting
Joined: Feb 2006
Posts: 1,423
Likes: 96
From: Magnolia Tx
My '86 had the old style tape drive window regulators. I tried every trick to speed them up
with various lubes. None helped. I replaced both sides with later model regulators, fixed and
very reliable. The tape drives are just bad.
with various lubes. None helped. I replaced both sides with later model regulators, fixed and
very reliable. The tape drives are just bad.
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Thread Starter
Pro
Joined: Dec 2013
Posts: 678
Likes: 12
Benny did you have to modify anything. I have been told that even a 1994/95 would work but I am concerned that it might now be a direct fit. Was it a lot of trouble to go to a later model regulator?
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I upgraded the old ribbon style window regulators with the newer ones. The instructions say you have to drill mounting holes in the bottom of the door but mine already had the holes. I have an early '86 (December 1985). I heard the late '86 cars had the improved window regulators.
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
I updated my 85's ribbon style to the later design - in my case, i'm thinking 87 regulator assemblies (at least what I remember from the date codes). installation was fairly straight forward - only had to drill two holes. mid-america corvette has excellent, on-line, tech instructions.
helpful links -
http://forum.grumpysperformance.com/...php?f=35&t=103
http://forum.grumpysperformance.com/...hp?f=35&t=2072
I understand even later designs had improvement, but in my case, i'd guess both sides have about a 2 sec travel time. IMO, one of the best updates for early C4's. even solved my glass rattle problems!
helpful links -
http://forum.grumpysperformance.com/...php?f=35&t=103
http://forum.grumpysperformance.com/...hp?f=35&t=2072
I understand even later designs had improvement, but in my case, i'd guess both sides have about a 2 sec travel time. IMO, one of the best updates for early C4's. even solved my glass rattle problems!
Last edited by Joe C; May 18, 2016 at 04:52 AM.
Drifting
Joined: Feb 2006
Posts: 1,423
Likes: 96
From: Magnolia Tx
Safety Car
Joined: Jan 2014
Posts: 4,017
Likes: 492
From: Poughkeepsie New York
I also upgraded to the newer style regulators and also added the later window guide rods to eliminate the window rattle. Not a difficult project. On mine the wiring had to be reversed for the passenger side regulator since up on the switch went down on the window lol.
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Like the others, Clean and lube the tracks and pivots.
Check and clean the motor connector and contacts as well.
IF your passenger side is a tape ribbon, replace it now!
You can find the replace tape in the "emergency" section of most parts stores.
Check and clean the motor connector and contacts as well.
IF your passenger side is a tape ribbon, replace it now!
You can find the replace tape in the "emergency" section of most parts stores.
Melting Slicks
Joined: Apr 2011
Posts: 3,495
Likes: 475
From: New Jersey
I upgraded the old ribbon style window regulators with the newer ones. The instructions say you have to drill mounting holes in the bottom of the door but mine already had the holes. I have an early '86 (December 1985). I heard the late '86 cars had the improved window regulators.
Melting Slicks
Joined: Apr 2011
Posts: 3,495
Likes: 475
From: New Jersey
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
I upgraded the old ribbon style window regulators with the newer ones. The instructions say you have to drill mounting holes in the bottom of the door but mine already had the holes. I have an early '86 (December 1985). I heard the late '86 cars had the improved window regulators.
Melting Slicks
Joined: Apr 2011
Posts: 3,495
Likes: 475
From: New Jersey
Not from my experience. I have had both of my doors open and both are ribbon regulators. Build date 11/20/85.