Window washer runs when wipers are on - The 1947 - Present Chevrolet & GMC Truck Message Board Network

74chevylvr · 08-29-2019, 07:16 PM

Replaced the plastic bits in the washer motor today. When I run the wipers now the washer fluid is always on.

74 truck with a 78 harness and the wiper switch out of a 78. Any thoughts? I searched but couldn't find a good answer

**rgunlock** · 08-30-2019, 12:53 PM

There have been a number of threads on this problem. Seems this is generally an issue that lots of folks have with the '78 washer/wiper. Remans are prone to this issue. I went through 2 in a matter of months and finally gave up and installed a separate washer pump.

tucsonjwt · 08-31-2019, 06:33 PM

x2 on the separate washer pump. My 83 has the integral wiper motor/washer motor and they have to be replaced as one unit - AC Delco is about $100 - and the washer gives out but the wiper motor keeps working. I used a $12 motor from the local Auto Zone and it works better than the stock one. No "clunk, clunk, clunk" when using the washer. The fluid squirts for as long as you are pressing on the washer button.

**Robert Crandall** · 09-01-2019, 09:39 PM

Mine did, and probably still does. I posted what I found in posts 7 & 8 here:

http://67-72chevytrucks.com/vboard/s...62#post8504462

I have older trucks that never had a washer, so I'm used to not having one. I've almost forgotten this newer one ever had one, but I will look for a fix if that original wiper motor ever quits.

**MikeB** · 09-06-2019, 04:02 PM

Not sure if your 74's wiper/washer setup is the same as my 82, but mine had the same problem intermittently. Took it apart and thought I had it fixed, but it started doing the same thing after a few uses. It's a huge Rube Golberg mechanical contraption, and I think what happens is the two nylon parts get worn down. And, of course, they are unavailable.

Bought a rebuilt one at a parts store, and it had the same problem. Took it back and got another that looked brand new (from another supplier), but the washer didn't work. Finally gave up and removed a few parts to disable the washer, and then wired in an electric pump. Works great now and sprays as long as I press on the switch.

74chevylvr · 09-06-2019, 04:14 PM

Funny, I just finished replacing the motor with a cardone unit, and it works perfectly. Just an old warn out unit

**MikeB** · 09-06-2019, 04:19 PM

Quote:

Originally Posted by 74chevylvr

Funny, I just finished replacing the motor with a cardone unit, and it works perfectly. Just an old warn out unit

Nice, I should be that lucky. Maybe I should have tired a 3rd one!

08-29-2019, 07:16 PM	#1
74chevylvr Registered User Join Date: Apr 2019 Location: San Diego, CA Posts: 19	Window washer runs when wipers are on Replaced the plastic bits in the washer motor today. When I run the wipers now the washer fluid is always on. 74 truck with a 78 harness and the wiper switch out of a 78. Any thoughts? I searched but couldn't find a good answer

08-30-2019, 12:53 PM	#2
rgunlock Senior Member Join Date: Jul 2009 Location: Tomball, Texas Posts: 1,592	Re: Window washer runs when wipers are on There have been a number of threads on this problem. Seems this is generally an issue that lots of folks have with the '78 washer/wiper. Remans are prone to this issue. I went through 2 in a matter of months and finally gave up and installed a separate washer pump. __________________ Rick 78 GMC K15 SWB, 350/NV4500/NP205/4.10s Project Hazel 71 GMC C25 350/TH400 - Project Angie 59 Chevy SWB Stepside (next in line? Not sure now ) 2001 GMC Sierra K2500

08-31-2019, 06:33 PM	#3
tucsonjwt Registered User Join Date: Jul 2007 Location: Tucson, AZ Posts: 3,189	Re: Window washer runs when wipers are on x2 on the separate washer pump. My 83 has the integral wiper motor/washer motor and they have to be replaced as one unit - AC Delco is about $100 - and the washer gives out but the wiper motor keeps working. I used a $12 motor from the local Auto Zone and it works better than the stock one. No "clunk, clunk, clunk" when using the washer. The fluid squirts for as long as you are pressing on the washer button.

09-01-2019, 09:39 PM	#4
Robert Crandall Junior Member Join Date: Nov 2014 Location: Virginia Beach, Virginia Posts: 85	Re: Window washer runs when wipers are on Mine did, and probably still does. I posted what I found in posts 7 & 8 here: http://67-72chevytrucks.com/vboard/s...62#post8504462 I have older trucks that never had a washer, so I'm used to not having one. I've almost forgotten this newer one ever had one, but I will look for a fix if that original wiper motor ever quits.

09-06-2019, 04:02 PM	#5
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,597	Re: Window washer runs when wipers are on Not sure if your 74's wiper/washer setup is the same as my 82, but mine had the same problem intermittently. Took it apart and thought I had it fixed, but it started doing the same thing after a few uses. It's a huge Rube Golberg mechanical contraption, and I think what happens is the two nylon parts get worn down. And, of course, they are unavailable. Bought a rebuilt one at a parts store, and it had the same problem. Took it back and got another that looked brand new (from another supplier), but the washer didn't work. Finally gave up and removed a few parts to disable the washer, and then wired in an electric pump. Works great now and sprays as long as I press on the switch. __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! Last edited by MikeB; 09-06-2019 at 04:11 PM.

09-06-2019, 04:14 PM	#6
74chevylvr Registered User Join Date: Apr 2019 Location: San Diego, CA Posts: 19	Re: Window washer runs when wipers are on Funny, I just finished replacing the motor with a cardone unit, and it works perfectly. Just an old warn out unit



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