mwier76

I have a 74 coupe that I purchased six months ago. Just got it back on the road. Power windows on both sides go up and down very slowly. I often have to pull them up the last inch or so. Is there a way to lubricate these or are the regulators just shot and need replacement?

Hoping to get a little driving time in yet before the Michigan winter!

Any feedback would be appreciated.

mrvette

Take them all apart, remove glass first, two bolts, and carefully lift out....pull every 7/16 headed bolt you find inside that door, and the whole thing slips out in pieces....you need to take the bars and nylon wheels and soak overnight in a pan of gasoline to cut the factory dried out white grease...

reassemble dry....nylon roller don't need grease....

put some fresh grease/lube in the motor gear housing, oil the motor bearings....

if still slow, which I doubt...you can ground the doors to the birdcage as sometimes the hinges don't conduct the best....

SliverblueC3

I had the same problem with the left one. I removed the door panel and used PB Blaster on the window regulator, guide rails and grease on the gear. It is now faster than a speeding bullit. Also lube the door lock assembly while you are there.

mwier76

Thanks. I'll give it a try.

Ganey

I lube w/ white lithium grease. Make sure all the el. connections are good.

7T1vette

PB Blaster is good for removing any rust/corrosion on the moving parts; but it is not a lubricant. Use the while lithium grease suggested. Use it from a tube, rather than a spray can....unless you just can't reach that area to lube it properly.

But your problem may be electrical, rather than mechanical. The window switch contacts can become burnt/worn and/or the motor brushes can wear out. If both windows started working slowly at the same time, I would start by checking for the integrity of the primary power [supply] wiring and grounding connections; then check-out the 'internal' components.

jdp6000

It could possible be the regulator springs. they help with the up motion. See if they have broken off and fallen to the bottom of the door.

See it in the picture....

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Ganey

If a regulator spring is broken it will go down fast & up slower as it comes to the top & probably won't go all up.

dburgjohn

I replaced the passenger motor (cleaned while out) but it is slow. Driver side is fast. If motor is new, tracks clean, spring unbroken, what else could do that?

Peterbuilt

The glass can rub on the weather stripping, is it fast with the door open? PG.

dburgjohn

speed same door open or shut. sometimes stops not all way up when shut

mwier76

I used the PB Blast and both are now going up and down much better. On the driver's side I still get a little bit of clunking as it goes up but it is going up. Thanks for all the help!

7T1vette

'Clunking' probably indicates some wear/bining of the scissor-lift mechanism. The pivot can wear and get loose, then start binding. If you remove the inner door panel and put the window at the middle of its travel, you can 'wiggle' the lift members and see how much slop there is. Then, run it up and down while watching the mechanism for any buckling/binding of components. You can try to free them up lubricating them; that may work for a while. But replacing the rollers and pivot pins may be the only long-term solution. Check it out and see what is going on in there.