Technical Vacuum Line help

I have a T off the manifold for the vacuum lines for the break booster and wipers. The line to the wipers has two extra ports on it not hooked to anything. There is one line to the vacuum motor. should there be two to the wiper motor? I have an arrow pointing at what looks to be where a line would go. Im just debating on capping the line and going electric. I thought I once heard those wiper motors typically have issues.

 

here is the correct picture with markings

 

You need a factory shop manual that shows where all the vacuum lines go. But I believe you are correct, 2 lines go to the wiper motor. IIRC the 2nd vacuum line has something to do with the windshield washers.

 

I did one for a '57 Chevy. I think one line runs the wipers. I think covering and uncovering the other port makes high and low speed. The 2nd line may have gone to the switch where it was open or closed depending on speed chosen. I just rebuild the motors. I had no car or switch to check it out. I also do Early Broncos. One port, one speed. While testing the Chevy motor on the vacuum pump, I found the speed difference fooling with the extra port. I thought it may have been to park the wipers, it did not. Mike

A pic of Broncos, only 1 port and 1 speed.


The '57 Chevy. Sorry, can't see both ports.

 

i have one of the ones like on the bottom, i cant bring life back to it, they seem finicky.

 

So this is just me...... but I'm in the electric motor camp. In a rod with double or more of the original power and upgraded trans, clutch, rear axle, brakes, etc., vacuum wipers are just a bit too traditionally nostalgic for my agenda. I don't deal well with wipers that take a time-out every time I open the throttle right when I need them most.
If you have a simple fix, I can relate to keeping the status quo. But if you have to remove, repair, replace, anyway then I think it makes more sense to take the opportunity to upgrade to electric.
Check those old hoses for cracks and hardness that are likely to crack. I once had a leak that I couldn't find for the longest time. Turned out there was a split under a hose clamp that was impossible to find without removing the hose and making a close inspection.

 

All the vacuum wiper motors I've ever dealt with only used one vacuum line, and there always seemed to be another fitting that looked like it might be for a vacuum hose, but not.

If the vacuum wiper motor works, with one hose connected in the correct place, then use it. If it doesn't work (like most of them) then you might want to consider getting an electric motor.

It's generally a good idea to not have anything Teed from the vacuum line that feeds the brake booster. Something about safety.

 

The 2nd hose is for the windshield washer coordinator.

 

Huh, that one looks to have more than just 2 vacuum connections. Different motor than the one I did. It had no "washer coordinator". It does look like the OP's though. I'd like to hook it up to the vacuum pump and see what makes it tick. The trick to fixing them is that there are little to no replacement parts. You have to start with good leather on the paddle's edge (often, a corner has pulled off) and good gaskets will save you a bunch of time. There are usually some fidgety tricks to re-***embling the springs and linkages (Rubick had nothing on these guys). Shoot one of the tiny springs, or other bits, across the shop and you will regret it . Mike

 

I think the 2 vacuum ports are for high and low speed on the wiper motor. The coordinator times the water pulses with the wipers so the sprays of water don't hit the wiper blades. From what I can tell the coordinator was only on Cadillacs, Buick Roadmasters, and Olds 98's. May be the same with the 2 port wiper motor for the 2 speeds.

 

I’d go with the electric conversion if it’s a driver. My dad had a ‘46 Chevy 1.5 ton and any acceleration the wipers slowed. Hardly moved up a grade. He fashioned in a reserve tank, which worked well on flat roads, but still didn’t last long on a grade.

 

I have vacuum wipers on my 49 Buick. I love listing to the **** and click noises that they make when it's raining. I think it's a big part of the whole deal of driving a 50's car. Reminds me of riding with my dad in his 53 Olds. With a reserve tank they can go up a hill without stopping, unless you have your foot in it. But that's just my memories.