How does this T-valve function?
Thread Starter
Intermediate
Joined: Aug 2016
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How does this T-valve function?
Trouble shooting why lights will not go up, and found the diagrams posted here very helpful. Is the vacuum block shown here simply a T distribution block, or does it serve another function? With the vacuum pump connected on the single side, and my fingers over the other two ends, it will not hold any vacuum. The other systems check out ok, so this does not seem right...
Thank you.
Thank you.
Drifting
Joined: Jul 2006
Posts: 1,259
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From: Deplorableville Nebraska
Is the vacuum block shown here simply a T distribution block, or does it serve another function?
The distribution side of the valve needs to be vacuum tight. Obviously yours is not. My guess is the valve is allowing atmosphere (leaking) at the point where the two halves of the valve are crimped together. To check it, block the ports on the two port side, connect a hose to the single side, and push air through it under water. If you get bubbles, it's toast.
The other systems check out ok
Thread Starter
Intermediate
Joined: Aug 2016
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"Which systems are you referring to? What year is your car?"
Other vacuum checks for the under-dash connections, and vacuum checks on the headlight side of system.
Car is a 79.
I will pick up a straight T to connect in place of valve just to check operation.
Other vacuum checks for the under-dash connections, and vacuum checks on the headlight side of system.
Car is a 79.
I will pick up a straight T to connect in place of valve just to check operation.
Thread Starter
Intermediate
Joined: Aug 2016
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of course nothing is ever easy--looks like I have more troubleshooting ahead. Put a T-valve in to ensure I had full vacuum to the system. The lights will not come up on their own. Once they are manually brought up with light switch on, the one light will decide to eventually go down on its own, and the other will only go down manually.
Thought this was interesting... with lights on and the one headlight in the up position-- I would manually try pulling the 2nd light up, and the opposite light goes to the down position, almost like the two lights are working against each other.
First order I suppose is to track the line to ensure they are all in the right places, and go from there.
Thought this was interesting... with lights on and the one headlight in the up position-- I would manually try pulling the 2nd light up, and the opposite light goes to the down position, almost like the two lights are working against each other.
First order I suppose is to track the line to ensure they are all in the right places, and go from there.
Drifting
Joined: Jul 2006
Posts: 1,259
Likes: 154
From: Deplorableville Nebraska
Actuating vacuum commonly will travel through the vacuum tank between the up or down hoses to balance out the amount of vacuum if you have a leak in the actuators or/and relays. Check each one individually, and insure your hose/vacuum port connections are tight.
