'95 Z28 restoration

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Apr 6, 2011 | 05:56 AM

#31

xxsaint69x

Registered User

Joined: May 2000

Posts: 2,889

From: Peachtree City, GA

Re: '95 Z28 restoration

Quote:

Originally Posted by Brangeta

According to the part number though, I'm supposed to have something like this hiding back there...

this is a check valve that controls the HVAC panel. It is located inside the engine bay next to the heater box...has 3 vacuum lines going to it.

Apr 9, 2011 | 07:12 AM

#32

95mysticta

Registered User

Joined: Dec 2005

Posts: 685

From: Oshawa, Ontario

Re: '95 Z28 restoration

WoW that underbody is super clean for how many miles are on it... no rust whatsoever! I wish mine was as clean as that so i didnt have to do floors and what not. One day ill grab a nice roller to eventually swap all my stuff over too.

Apr 9, 2011 | 11:14 AM

#33

Injuneer

Administrator

Joined: Nov 1998

Posts: 71,094

From: Hell was full so they sent me to NJ

Re: '95 Z28 restoration

Shoebox has a vacuum diagram for the HVAC panel:

http://shbox.com/1/hvac_vacuum.jpg

and a photo of the check valve:

http://shbox.com/1/vac_check_valve.jpg

Apr 10, 2011 | 11:56 AM

#34

RobbyRob

Registered User

Joined: Jun 2002

Posts: 487

From: Davie,Florida

Re: '95 Z28 restoration

Quote:

Originally Posted by SnakeOiler

That's actually not the correct procedure.

You don't. The bleed screws are only opened when you fill the system.

Proper drain/fill procedure

Your car looks great. The leather is in great shape - is it original? Amazing that all of your A/C needed replacing.

I've had mine since Aug 1994 and other than some minor paint issues, just the headliner is only problem I have currently. Material is starting to droop on the liner. I gotta get that fixed.

The bleeder screws are at a high point in the system. So it is recommended to crack to open when engine is running to bleed off the air that gets trapped in that high point. The reverse cooling makes it hard for the trapped air in this high point to escape. One little air pocket can create a hot spot. Which is not good. Beside you think GM would put it there if it wasn't necessary.

But it was necessary. So it should be bleed off everytime anytime coolant is changed or added..

Apr 10, 2011 | 12:47 PM

#35

Brangeta

Thread Starter

Registered User

Joined: May 2002

Posts: 5,557

From: Dallas, Texas

Re: '95 Z28 restoration

I bought a used A/C control panel off ebay that should be arriving any day now. At some point I'll put the proper "appearance" back on the car if the panel I bought is in good shape.