Home page
SPONSOR AD SPONSOR AD

Topic: '70 vacuum hoses

in Forum: C3 General Discussion


'70 vacuum hoses

Posted: 1/30/11 5:33pm Message 1 of 8
Profile Pic
Lifetime MemberLifetime Member
Send PM
Manteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold 1975 L48 4 speed
 OSSW1 and myself got together recently and installed a new vacuum hose kit (w/diagram) for the headlight, w/w door actuator on one of his '70s. We covered all the bases but when you turn on the headlights the wiper door opens also and neither will close. We plan on teaming up on this again this week to correct it. Does this phenomena sound familiar to any one. Any hints might shorten our diagnostic process. I thought I remember the headlights on my '78 doing this before when I nocked a hose loose without knowing.


SPONSOR AD:: (Our Sponsors help support C3VR)

'70 vacuum hoses

Posted: 1/30/11 6:03pm Message 2 of 8
Lifetime MemberLifetime Member
Send PM
Canada
Joined: 8/6/2004
Posts: 533
Vette(s): Coupe 74 - 454 Drive it like you stole it!
I recently did the same but haven't tried the system yet.  My kit came with a diagram as well, but I looked at many others from different internet sources.

All over the web, there seems to be confusion about the connections at the light switch.

My conclusion for the light switch is that "white" is near driver and "blue" is towards engine. See if that what you have.  I also have quite a bend at the bypass switch (really wish that vacuum line would have been 2 inches longer).  See if you have one bend.

I don't have a vacuum door, so can't help you much here.  Regardless, you know it's the subset of the system where your headlight & vaccum hoses cross a t-connector or a bypass valve.

Good luck!



'70 vacuum hoses

Posted: 1/30/11 6:03pm Message 3 of 8
Profile Pic
Lifetime MemberLifetime Member
Moderator
Send PM
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20229
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
Perhaps the diagram isn't right, or ya just missed/crossed a couple of hoses. The only place that the wiper door and headlight vacuum hoses even come close to each other is at the over-ride knob/pulls under the steering column....that's where I think I would start..


Joel Adams
C3VR Lifetime Member #56    

My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

'70 vacuum hoses

Posted: 1/30/11 6:14pm Message 4 of 8
Profile Pic
Former Member
Send PM
York, PA - USA
Joined: 5/18/2010
Posts: 1518
Vette(s): 1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top
Check the wiper door actuator by the brake booster..it sounds like you swapped one of those big hoses..I assume since you say none will go down you are including the wiper door..if you have a vacuum leak for the wiper door it shuts down the system..mine did something similar..wiper door went up and down and headlights..drive me nuts..was like that for at least 12 years..isolate the wiper door by pinching off the vacuum to it..or disconnect and plug it..see if your problem goes away..I got this system in my head pretty good..if you want my number I can talk ya thru it..my car is a technical 70..
Rich



My first parade at Carlisle 2010

'70 vacuum hoses

Posted: 2/1/11 12:35pm Message 5 of 8
Profile Pic
Lifetime MemberLifetime Member
Send PM
Manteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold 1975 L48 4 speed
 Thank you gentlemen for the quick response. It's 85 mi. between us so it's not that easy to get together. Your info will give us confidence before going in and I'm sure we'll be successful. If not we'll give you a PM Rich. We're meeting on Thurs. We'll let you know how things go.


'70 vacuum hoses

Posted: 2/1/11 1:33pm Message 6 of 8
Lifetime MemberLifetime Member
Send PM
Equinunk, PA - USA
Joined: 10/31/2007
Posts: 2480
Vette(s): 1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.
 I had a slight problem with mine as well. Found out the lines were reversed at the manifold and PVC connections.


'70 vacuum hoses

Posted: 2/5/11 10:28am Message 7 of 8
Profile Pic
Lifetime MemberLifetime Member
Send PM
Manteca, CA - USA
Joined: 11/20/2005
Posts: 3623
Vette(s): 1978,two tone,Metalic Rootbeer & gold 1975 L48 4 speed
 Success ! Yes, the headlight hoses were inverted (pre existing Big smile), but we had to pull out the dash and console to ID and correct everything and replacing those is no walk in the park Disapprove. More tinkering to do to get everything back right, and to think, I have this job to do on at least 2 of my cars Ouch. Let the good times roll. Thanks for your help brothers.


'70 vacuum hoses

Posted: 2/5/11 10:41am Message 8 of 8
Profile Pic
Lifetime MemberLifetime Member
Send PM
Sykesville, MD - USA
Joined: 4/27/2008
Posts: 4240
Vette(s): 1979 Corvette Coupe Corvette Light Blue Midnight Blue interior Mirrored Glass T-tops
Yeah, but at least your cars don't have wiper doors!
 
Barry
 
Thumbs Up



"Down on the Boardwalk...

(Click image to see a larger version}
 
Lifetime Member #181

in Forum: C3 General Discussion


SPONSOR AD: (Our Sponsors help support C3VR)