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Old Sep 7, 2010 | 10:49 PM
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Default headlight help request

had planned on getting to the vacuum system soon, but it has reared it's ugly head now. The headlights came up (passenger side with help), but will not go down. Check valve? And aren't there two of them? Replace both?
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Old Sep 8, 2010 | 12:24 AM
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What year?
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Old Sep 8, 2010 | 09:15 AM
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ooops, sorry!...70 coupe, big block, four speed
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Old Sep 8, 2010 | 10:28 AM
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One check valve; one filter; one relay for each headlight; one relay for the wiper door. Willcox has a fairly good diagram of the vacuum system.

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Old Sep 8, 2010 | 11:53 AM
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Don't just guess at what might be broken, do some troubleshooting:

http://www.corvette-101.com/vacuum.htm
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Old Sep 8, 2010 | 12:30 PM
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do you have that **** under the steering column that makes them stay opened? if it is on your '70, that is an easy check. i have it on my '76.
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Old Sep 8, 2010 | 02:26 PM
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Originally Posted by woodvette03
do you have that **** under the steering column that makes them stay opened?...
He should have three. Headlight override; wiper door override; and wiper stop.

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Old Sep 8, 2010 | 03:39 PM
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Hi TZN,
I believe it's a good idea to first buy a vacuum pump with a gauge (like a Mity-Vac) and trouble shooting guide (like the one from Dr. Rebuild) before you start replacing parts.
Replacing parts can get VERY expensive very fast until you finally replace the failed component.
I also wouldn't touch the vacuum system without the 70 GM CHASSIS SERVICE MANUAL.
Regards,
Alan
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Old Sep 8, 2010 | 08:26 PM
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I am going to read through the troubleshooting guide that Mike linked to this thread; thanks! I'll probably go ahead and order the guide and valve and filter (to make the minimum purchase requirement) from the Doc, and troubleshoot and see what I need. Thanks for the help, guys!
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