1999 C2500 Windshield Wipers Not Going Down Far Enough At Rest

[Westieterrier]

After looking at many pictures and actual GMT400 trucks on the road, I notice that my windshield wipers seem to stop at rest several inches too high. The truck is new to me, so I don't know what the configuration was in 1999. While they are not significantly blocking my view, I was wondering if there is any easy fix that does not involve disassembling too much. I've had the wipers off to reposition, but unlike my '66 Chevy El Camino, these wiper arms have a slot for a tab on the gear, so they only go on one way, and can't be rotated counterclockwise on the gear. That would have been too easy! Anyone out there fix this minor annoyance? Thanks to any folks who have thoughtful ideas . . . . P

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[dwragon]

They may be the wrong arms, the motor could be out of time / wrong one or the circuit could be being interrupted. If it has a delay module, it could be bad. Any time I have wiper problems I run a ground from the case, which floats on rubber bushings, because corrosion or malfunction can interrupt the ground. You certainly need to fix it because them being up is costing you in wind resistance/gas milage, and are probably in your line of sight (Plus look goofy.). For the most aerodynamic truck GM ever made, it baffles me that they didn't put the wipers under the cowl or under the hood.

 

[mattillac]

I know very little about the subject but do recall reading that others have had this issue.

Seems to be some directions here for adjusting / repositioning them.

wiper arms

Yep, that's the idea I am looking for, are they using JB weld. ( 2 part putty ) I would use an actual welder. I haven't used JB Weld much and don't know how it would hold up.

www.gmt400.com

Best of luck.

Edit, if you do take things apart, you might want to add a dab of silicone to one or two of those screws on the passenger side when reassembling, one of those screw holes have a tendency to leak water which winds up in the heater box assembly and on the passenger side floor.

Read here.

the mysterious interior rain leak

I did the water test again with the garden hose in the center of the opened cowl and no leaks which confirmed that water was only leaking through the passenger screw hole. Put silicone over hole, screwed it down and silconed over screw. Rained really good overnight and everything inside is bone...

www.gmt400.com

Been there, done that.

 

[Darkimag22]

Had the same issue. You need to re-adjust the wiper arms by removing the black cowl along the bottom of the windshield. Once you remove that, it will make more sense.

 

[Westieterrier]

Thank you gentlemen, and thank you DarkImage and Matt for the link. I followed the instructions and it worked perfectly!! The wipers are now in a much better position. See pics below for the linkage you can adjust to do this. I'll only add that one must be very careful, even gentle, when removing all the plastic componentry. Do not ask me why I say this . . . . .P

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[GMCTruck]

Nice work. I need to do that to my truck as well. The black plastic cowl falls apart easily. One thing that I will add, make sure your washer still shoots on both sides. It is very easy to pinch the hose when re-installing the cowl and then have the joy of taking it all apart again. And don't ask me why i say this.......

 

[GoToGuy]

When wipers switch to off the lower position is or was called, the wipers being in the "park " position.

 

[Dariusz Salomon]

Just make sure you put silicone on that screw over HVAC box once you removed it-you don't want the leak.

 

[Westieterrier]

Just make sure you put silicone on that screw over HVAC box once you removed it-you don't want the leak.

Hey Darius, I'm not sure what it is you are referring, but would like to know. Can you shoot over a quick picture of this screw location? Will do. Thanks man. P

 

[Westieterrier]

Nice work. I need to do that to my truck as well. The black plastic cowl falls apart easily. One thing that I will add, make sure your washer still shoots on both sides. It is very easy to pinch the hose when re-installing the cowl and then have the joy of taking it all apart again. And don't ask me why i say this.......

That is EXACTLY what happened to me! Then I broke the nozzle. But I got an exact replacement from Dorman the next day. Too funny. Thanks. P