headlight vacuum help
Thread Starter
Advanced
Joined: Jan 2001
Posts: 93
Likes: 0
From: Palm Springs, CA USA
headlight vacuum help
I am having a real fit with my headlights. They were working fine and I did some dash work and now they won't work at all. I have checked the headlight switch with a vacuum pump and the pull-down switch and both are functioning properly. I checked the vacuum tank and it holds vacuum fine. I have 15 lbs. of vacuum at the manifold. When I check the tank at the relay valve hose connection the drivers side has 15 lbs of vacuum and the passenger side is zero. Anyone have a clue what I have to do to get my lights to work again? Thanks, Wells
Pro
Joined: Dec 2002
Posts: 560
Likes: 1
From: Mooresville NC
When you did your dash work, did you remove the hose from the switch or the manual pulldown switch. The hose can NOT be switched around on the nipples. I had a similar problem for a good year. It wound up being the hoses on the pull down switch hoses were not pushed on fully.
Also check to see where the hoses go through the firewall. After many years they tend to be brittle and are less forgiving with pulling on them.
Good Luck.
Also check to see where the hoses go through the firewall. After many years they tend to be brittle and are less forgiving with pulling on them.
Good Luck.
Safety Car
Joined: Aug 2000
Posts: 3,734
Likes: 2
From: Southeastern PA
Vacuum
Originally Posted by wellsw
I am having a real fit with my headlights. They were working fine and I did some dash work and now they won't work at all. I have checked the headlight switch with a vacuum pump and the pull-down switch and both are functioning properly. I checked the vacuum tank and it holds vacuum fine. I have 15 lbs. of vacuum at the manifold. When I check the tank at the relay valve hose connection the drivers side has 15 lbs of vacuum and the passenger side is zero. Anyone have a clue what I have to do to get my lights to work again? Thanks, Wells
Did you disconnect/reconnect the heater/AC hoses?
Thread Starter
Advanced
Joined: Jan 2001
Posts: 93
Likes: 0
From: Palm Springs, CA USA
I have tried all combos for the blue and white hoses off the light switch the pull down is already color coded on both the plug in and the switch. Also I tried disconnecting the small line from the three line check valve and plugging the valve which take the two switches out of the loop and still the lights won't pop up.
Burning Brakes
Joined: Jun 2002
Posts: 837
Likes: 3
From: Texas
You may need the trusty old troubleshooting guide if you don't already have it.
http://www.corvette-101.com/ "vacuum trouble"
Try completely bypassing the check valve....just to see what happens.
http://www.corvette-101.com/ "vacuum trouble"
Try completely bypassing the check valve....just to see what happens.
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Team Owner
Joined: Jun 2004
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From: Smile, it's just the internet.
Originally Posted by wellsw
What tee are you talking about? On the vacuum tank?