AC Pneumatic Lines Routing - Team Camaro Tech
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post #1 of 7 (permalink) Old Feb 12th, 18, 05:46 AM Thread Starter
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AC Pneumatic Lines Routing

Hey Guys,


I'm working on a guy's '67 GTO and am not receiving help in the GTOforum.com site. I figured my concerns probably applies to same era Camaros and Chevelles so maybe someone out there knows this info.


A previous owner disconnected some of the lines and I am trying to figure out which lines go where. I have the diagram but when routed this way doors don't open properly. So I removed the controls and found they are numbered in a mirror image of the diagram.


The slide control has these markings:


DE-ICE HEAT OFF VENT OUT INSIDE



I am not absolutely sure but I believe these doors should move with each selection:

DE-ICE - LH actuator pulls defrost door to direct air to the windshield
HEAT - LH Actuator releases to allow air to floor
Off - No vacuum to anywhere
VENT - Air inlet pulled open and Diverter Door open to circulate into cabin
OUT - AC on with fresh air (Air inlet open)
INSIDE - AC on with recirculate (Air inlet closed)


So which hose goes onto which port to make this happen?


If there is anyone out there that can assist it will be greatly appreciated.


Thanks,
Andrew
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post #2 of 7 (permalink) Old Feb 12th, 18, 08:08 AM
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Re: AC Pneumatic Lines Routing

Maybe the Hose Connector shown on left side is the 'other side' of connector, the side plugging onto the device rather than the side shown?
I agree with you function to labels.
My older library just has the mechanics of components, no control circuits, sorry.

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post #3 of 7 (permalink) Old Feb 12th, 18, 03:40 PM
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Re: AC Pneumatic Lines Routing

1970 Corvette

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post #4 of 7 (permalink) Old Feb 12th, 18, 04:38 PM
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Re: AC Pneumatic Lines Routing

This A/C thread is for a 67 firebird, may be of some help
https://firstgenfirebird.org/forums/...=308070&page=1
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post #5 of 7 (permalink) Old Feb 13th, 18, 05:38 AM Thread Starter
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Re: AC Pneumatic Lines Routing

Thank you all for your help. For the benefit of someone else with the same question:

Using my Mityvac to pull a vacuum I tested all options of vacuum draw and which ports are open when the climate selectors are made. It seems the drawing posted above is correct when you follow the numbering on the manifold, which is numbered clockwise. You cannot see it unless you remove it from the dash.

Port Application
1 Actuator on firewall primary line
2 Actuator on firewall secondary line
3 Manifold vacuum
4 Actuator to direct air to defrost
5 Actuator to direct air through AC ducts

The only thing is I don't understand two lines routing to the engine bay dual line actuator. As in, why are two lines needed? Ports 1 & 2 route to it and either 1 or 2 or both will draw the actuator to swing the door. I believe I am going to assemble this "correctly" but put a plug in port 2 line so fresh air and recirculated air will work correctly.
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Last edited by Andrew69; Feb 13th, 18 at 05:49 AM.
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post #6 of 7 (permalink) Old Feb 13th, 18, 06:29 AM
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Re: AC Pneumatic Lines Routing

Port 1 to pull door open?
Port 2 for pulling door closed?
Hot water valve? Shut off heater water when AC is turned on?

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post #7 of 7 (permalink) Old Feb 13th, 18, 06:39 AM Thread Starter
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Re: AC Pneumatic Lines Routing

I tested it with the Mityvac. Either port on the actuator will draw the door towards it. No hot water valve that I am aware of. I had figured maybe the 2nd port was a partial opened door option. Puzzling.

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