vacuum gurus needed

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Oct 7, 2010 | 04:11 PM

early71

Thread Starter

Instructor

Joined: Oct 2006

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From: greeley pa.

vacuum gurus needed

After many trouble free years,wiper door quit last week.In 2-3 hours of poking around for obvious causes,I come up empty.Vac.relay is out,when I apply hand pump vac. to unit ,I can see movement at the end of it.I'm thinking it is bad.(original ) Any tests I can perform ?Actuator is new,and door can be opened by hand.Thanks crew...JC

Oct 7, 2010 | 04:20 PM

Alan 71

Team Owner

Joined: Sep 2006

Posts: 31,108

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From: Westminster Maryland

Hi JC,
I've found the component testing and trouble shooting guide that 'Dr. Rebuild' wrote and sells is well worth the few $ it costs.
Regards,
Alan

Oct 7, 2010 | 06:56 PM

kingkohlmn

Pro

Joined: Mar 2007

Posts: 724

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From: Austin TX area

Quote:

Originally Posted by Alan 71

Hi JC,
I've found the component testing and trouble shooting guide that 'Dr. Rebuild' wrote and sells is well worth the few $ it costs.
Regards,
Alan

100% Well worth the $4-5.00.

Oct 7, 2010 | 09:31 PM

7T1vette

Team Owner

Joined: Jan 2006

Posts: 37,637

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From: Crossville TN

You really can't use one of those hand-operated vacuum pumps to do any 'significant' testing on a C3 vacuum system. It just doesn't provide enough volume (or anti-volume, I guess...) to make anything work. There are usually leakages that exhaust anything that pump might provide...even on good systems.

Oct 8, 2010 | 01:04 PM

Easy Mike

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From: Southbound

Cruise-In II Veteran

Does the wiper door open/close with the override?

Oct 8, 2010 | 02:25 PM

early71

Thread Starter

Instructor

Joined: Oct 2006

Posts: 108

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From: greeley pa.

override

Mike,override does nothing,I'm not getting vac to relay and relay just tested bad.Seems the further I look,more problems I find....JC

Oct 8, 2010 | 03:32 PM

1971corvette

Burning Brakes

Joined: Oct 2002

Posts: 1,040

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Quote:

Originally Posted by 7T1vette

the hand pump is good for testing individual parts one at a time
,to test the system as a whole, NO the pump does not provide enough vacuum as ststed above,thank you 7T1

Oct 8, 2010 | 04:18 PM

dntoearthman

Racer

Joined: Feb 2010

Posts: 362

Likes: 10

From: nashville tn

Vacum pump

I do not have a good pump but am planning on building one from an AC compressor.

I adapted an air hose to main vacum line on my vette, ran it out the garage to my Lexus engines vacum port. works great for short term testing.