72 headlight and wiper door problem

[Martin T.]

--------------------------------------------------------------------------------

I have discovered a lazy headlight and a wiper door that is not opening. The check valve has been replaced (though nothing appeared wrong with the other one), the seals have been replaced on the vacuum pots and both worked well 1000 miles ago. Any suggestions??

[Harmon C.]

Re: 72 headlight and wiper door problem

I would check out the system till I found the leak. Theirs not enough information to pin point the problem. I use a tank and an A/C pump to supply a source of vacumn so I can hear the leaks.
Lyle

[Harmon C.]

Re: 72 headlight and wiper door problem

I would check out the system till I found the leak. Theirs not enough information to pin point the problem. I use a tank and an A/C pump to supply a source of vacumn so I can hear the leaks.
Lyle

[Chuck R.]

Re: 72 headlight and wiper door problem

A split vacuum line connection "somewhere" would be my first bet.

If all the hoses appear to be solid, I would then investigate all the valves and pots again.

If nothing is found, I would look next at the main vacuum canister for a potential split seam, separated fitting or rust hole.

Chuck

[Chuck R.]

Re: 72 headlight and wiper door problem

A split vacuum line connection "somewhere" would be my first bet.

If all the hoses appear to be solid, I would then investigate all the valves and pots again.

If nothing is found, I would look next at the main vacuum canister for a potential split seam, separated fitting or rust hole.

Chuck

[Chuck R.]

Re: By the way

Don't rule out the bypass valves in the cockpit under the dash and those hoses as well

Chuckster

[Chuck R.]

Re: By the way

Don't rule out the bypass valves in the cockpit under the dash and those hoses as well

Chuckster

[Jack H.]

Re: 72 headlight and wiper door problem

Understand from the vacuum routing path that the RH headlight and wiper door SHARE a common vac servo path, separate from the LH headlight door. So, leak(s) anywhere on that side of the system will affect BOTH devices...

Also, don't overlook the vac system filter while you're diagnosing things. A lot of folks don't bother doing preventive maintenance (filter was intended to be replaced every year or so) and a clogged filter can result in 'squirrely' vac system operation when there are no leak(s)...

[Jack H.]

Re: 72 headlight and wiper door problem

Understand from the vacuum routing path that the RH headlight and wiper door SHARE a common vac servo path, separate from the LH headlight door. So, leak(s) anywhere on that side of the system will affect BOTH devices...

Also, don't overlook the vac system filter while you're diagnosing things. A lot of folks don't bother doing preventive maintenance (filter was intended to be replaced every year or so) and a clogged filter can result in 'squirrely' vac system operation when there are no leak(s)...

[Pat M.]

Re: 72 headlight and wiper door problem

I've found the best and easiest way to diagnose a leak is to hook a long amount of tubing to a vacuum nipple on another running car and plug the other end into your main vacuum hose on the intake. If the outside car is far enough away, it will be quiet enough for you to check each vacuum relay, actuator, hose, etc. and listen for leaks. Works like a champ. Patrick Moresi #45881

[Pat M.]

Re: 72 headlight and wiper door problem

I've found the best and easiest way to diagnose a leak is to hook a long amount of tubing to a vacuum nipple on another running car and plug the other end into your main vacuum hose on the intake. If the outside car is far enough away, it will be quiet enough for you to check each vacuum relay, actuator, hose, etc. and listen for leaks. Works like a champ. Patrick Moresi #45881

[Martin T.]

Re: 72 headlight and wiper door problem

Thanks for the advice everyone. It was and is much appreciated The problem turned out to be a bad actuator switch.