Replaced rear wiper motor same problem

[boomer62]

I just replaced my rear wiper motor and it stops anywhere in its stroke, just like the orginal i took out. If you give it a little help it will work for a day or two. Low and hi work and it shuts off ok. It does not have any power to the stroke, it takes little effort to stop the wiper with your finger. Thanks for any help.

[Cruize]

I would guess that there is rust and maybe some dirt between the output shaft that the wiper attaches to and the bushings in the wiper assembly.

On my '95, I was able to disconnect the drive linkage to the shaft and then pound the shaft out (the shaft wouldn't even spin due to the rust.) Wrap some fine grit sandpaper around a pencil and sand any rust / dirt off the bushings. Clean up the output shaft too. Coat the shaft contact areas and bushings with lubricant. I used white lithium grease, which did not work too well in my situation. Sometimes the wiper works, sometimes it doesn't. My plastic gears are fairly worn and stripped, so a little crud will stop it from working.

[boomer62]

Replaced with one from auto zone. Same problem.

[534BC]

Originally Posted by Cruize

I would guess that there is rust and maybe some dirt between the output shaft that the wiper attaches to and the bushings in the wiper assembly.

On my '95, I was able to disconnect the drive linkage to the shaft and then pound the shaft out (the shaft wouldn't even spin due to the rust.) Wrap some fine grit sandpaper around a pencil and sand any rust / dirt off the bushings. Clean up the output shaft too. Coat the shaft contact areas and bushings with lubricant. I used white lithium grease, which did not work too well in my situation. Sometimes the wiper works, sometimes it doesn't. My plastic gears are fairly worn and stripped, so a little crud will stop it from working.

Exact same problem here with the exact same fix about 4 years ago.

[Cruize]

If I drove my Blazer on a normal basis, I think I would at least cycle the rear wiper every time it rained just to try and break up any corrosion that has started to develop.

I don't normally use the rear wiper in the rain, but it is nice to have for those rare occasions.