Air window regulator

I think Dorman has a regulator replacement for your 379.

 

How did you end up fixing your pass air window ??? I have 94’ 379 also & am having problem know with mine, air up air down works but it wont stay up as soon as I let go of toggle it falls down.. any info/advice would be great

 

PeteDmpDrvr, I'm having the same issue on my '84 359, Peterbilt wants $300 for a replacement, have you found them cheaper or a rebuild kit?

 

I got new pneumatic switches from Rush. $95 a piece but sure did fix the problem.

 

new one from pete 1st one lasted a million. this one will outlast me

 

2002 Pete 379 here.

Passenger side window keeps falling about 2 inches.

I removed the whole regulator unit. Completely took it apart. Comes apart from the top. 4 screws and top pice comes out.

Then removed the slide. Cleaned whole thing including the inside of the cylinder, which is rectangular by the way.

Sprayed some lubricant on the rubber seals and put whole thing back together.

Window works again without falling down, so far. Driven 450 miles and the window still up.

Give that a try first. Not that hard to do.

 

Need to see more posts like this on here.
Nice fix

 

I having the same problem on my 98 pete new regulator new switch and it still falls about aa quarter inch any suggestions would be great