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Old Jun 27, 2010 | 09:46 PM
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Default vacuum hose diagram

where would I find a diagram of the heater control vacuum lines on a 79 corvette .I have a tiny line coming thru the firewall and then going to the wiper arm area connecting to nothing
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Old Jun 28, 2010 | 10:05 AM
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Send me a PM with your email address and I'll send you a .pdf file with a complete climate-vacuum diagram for a 77 Vette. It's the best diagram I've found so far. It works for my 78 and is likely the same for your 79, too.

Jerry
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Old Jun 28, 2010 | 10:36 AM
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Originally Posted by 79c3man
where would I find a diagram of the heater control vacuum lines on a 79 corvette .I have a tiny line coming thru the firewall and then going to the wiper arm area connecting to nothing
Your tiny line problably goes to the flapper door on the right hand side of the cowl. This door closes with vacuum when the AC is on. Opens for fresh air.

The assembly instruction manual (AIM) shows the flapper installation; the AC section shows the vacuum supply line.

The fender is off of this car, but you can see the flapper door and the valve.

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Old Jun 28, 2010 | 12:25 PM
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yes thats the one ,thank you , but how the heck do I get to it to put the hose back on ?
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Old Jun 28, 2010 | 03:22 PM
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Originally Posted by 79c3man
yes thats the one ,thank you , but how the heck do I get to it to put the hose back on ?
There's a nipple on the front side (not shown in the pic). Remove the debris screen at the end of the wiper trough and you'll see it.

AIM shows it.

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Old Jun 29, 2010 | 01:33 PM
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Default kinda th esame issue here

ok instead of posting a new thread on this hopefully it will get noticed. i need to know where the main vacuum for the hvac switch goes all i can seem to find is diagrams for cars with cruise control my vette don't have cruise and before my switch didn'twork so i wire the canisters open to get air. well after a good bit of redoing i found the main line folded and tucked away on top of the dash. so now where does it go to get the vacuum it needs?
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Old Jun 29, 2010 | 01:39 PM
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elke: Check the assembly instruction manual (AIM) for your year under the AC section.

If memory serves, you will find a T off the main (headlight) vacuum line in the area of the rear of the left head.

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Old Jun 29, 2010 | 02:06 PM
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thanks mike there is a tee a lil ways from the check valves on the main headlight vacuum hose but its been plugged off. but it seems to be a large tee nothing that would fit the lil hard vacuum line. as for the manual is there anywhere i can find that without buying one. don't really see the need to spend 30 bucks for this. since this is the only thing i can't figure out lol
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Old Jun 29, 2010 | 03:27 PM
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Originally Posted by elke_10
...don't really see the need to spend 30 bucks for this. since this is the only thing i can't figure out...
Trust me. AIMs are worth their cost. Ditto for the chassis service manual.

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Old Jun 29, 2010 | 04:16 PM
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79..

You'll find a colored diagram at this link. http://willcoxcorvette.com/repairand...lp.php?hID=273

You will also find on that link one to the AIM on CD.

Willcox
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Old Jun 30, 2010 | 11:43 AM
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Originally Posted by Willcox Corvette
79..

You'll find a colored diagram at this link. http://willcoxcorvette.com/repairand...lp.php?hID=273

You will also find on that link one to the AIM on CD.

Willcox
Good stuff.
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Old Jul 4, 2010 | 08:56 AM
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Thanks Mike,

I'm working on a better one with actual hoses, relay's and parts and thinking about a video on how to test.

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