Alright how does the window washer on a 72 square work (upda

[COtype3]

I am wondering how to make it work. I filled it and nothing. Not sure i have been tracing the lines one goes into the firewall but not sure from there. I have heard i need to fill the spare but not sure what that means.

[joshivore]

the spare tire in the front provides the air pressure to spray the window washing fluid. if all else is in order, when you inflate the tire, you'll have a working window washer.

[raygreenwood]

It has an airline from the spare tire air valve. It goes to the washer fluid tank.

The screw in cap for the washer fluid tank has a spring loaded valve inside. It has a half moon shaped button that is pressed when you screw on the washer fluid cap. Once the vap has seated in the bottle a certain distance.....that button or switch pushes a spring valve releasing air pressure from the spare tite into the tank.

This pressurizes it and pushes the fluid out the out the bottom into the line to the simple valve that is behind the lever on your steeromy column

Pull the lever and it lets pressuruzed fluid to flow through to the nozzle below the windshield.

The valve in the top of the washer bottle has a specific spring load pressure. This is wo that it allows air from the spare tire into the bottle until the pressure falls to a specific psi level. Then it cuts off the airflow wo that it does not drain the spare tire below the absolute minimum.

You need to check the book for pressure listing. I know on the 411 and 412 wagons.....they had a red colored valve that worked with higher pressure so that the safety factor in the tire was left higher. This is because if the spare was to be needed for the rear end of the car....tje load factor could be higher in a wagon.

Nifty system. Its problems with age are:

1. Air leaks from the sealing ring on thr spare tire valve
2. Air leaks from the gasket on the valve that screws into the washer fluid bottle
3. The spring valve getting weak or sticking with age and allowing spare tire pressure to be lost
4. The rubber cuffs that clamp the air inlet line to the washer bottle valve rotting away and blowing loose.
5. The same types of rubber cuffs rotting away on the dash lever valve and letting the pressure line pop off.....soaking everything....or the outlet line popping loose.

Ray

[sjbartnik]

ray nailed it (as always). Once you hook up the spare tire and pressurize the system (with washer fluid in the bottle) you will quickly find out about any leaky hoses.

I would suggest for the first time you put only a minimal amount of fluid in the bottle and then hook it up to pressurized air.

There is a fluid line that runs from the bottom of the washer tank into the car to the wiper switch (I don't know if the '72 has the wiper switch on the dash or on the steering column). The wiper switch has a valve in it that is opened when you either push the button (dash-mount switch) or pull the lever (column mount switch). There is then another fluid line that runs from the switch to the nozzles at the base of the windshield and the air pressure pushes the fluid through.

Needless to say if either of those lines are rotten you will get a washer fluid leak inside the car.

If you need to replace the lines make sure to use proper VW washer fluid hose. I think I got mine from bughaus.com - regular vacuum hose doesn't hold up too well to the pressure and the proper hose is really small ID, something like 2.5mm or something so larger stuff likes to pop off the hose barbs and spray fluid around inside the car.
_________________
1965 Volkswagen 1500 Variant S
2000 Kawasaki W650

[Bobnotch]

Or you can do like a few of us here have done, and that's convert the whole system to an electric pump and micro switch to activate the pump.
_________________
Bob 65 Notch S with Sunroof
71 Notch ...aka Krunchy; build pics here;
http://www.thesamba.com/vw/forum/viewtopic.php?t=249390 -been busy working
64 T-34 Ghia...aka Wolfie, under construction... http://www.thesamba.com/vw/forum/viewtopic.php?t=412120

[COtype3]

What is needed to do the electric motor fir the wipers?

[Bobnotch]