A/C air shut off valve - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jbrownmxr · 11-11-2023, 09:21 PM

Can someone post a pick of the inside door vacuum switch configuration? Also it has a spring too?

**71CHEVYSHORTBED402** · 11-12-2023, 01:29 AM

It works like this. https://scontent-sjc3-1.xx.fbcdn.net...rg&oe=65560872

Short answer is that's operated by selecting INSIDE on your controller. That closes the upper cowl air door, and opens the kick panel door. INSIDE also shuts water circulation to the heater core via the water valve, for 1971-72. OUTSIDE does the opposite, or really, anytime that lever is not on INSIDE, the doors return to their default positions, and the water valve opens water flow to the core.

Pre-71 water valves are a bit different, IIRC. Somewhere around there, sorta

I really can only speak for 71-72.

Ooops, I see the OP is old as dirt. To answer the above question, the kick panel door assm. looks like this from the front. Here's the one at the upper cowl too. Neither are a "switch". They're vacuum operated, really cool stuff, IMO. The images don't show the vacuum lines.

The RH kick panel door assembly for an A/C system includes a recirculated vacuum actuator, two brackets, one return spring with hooks, a link, two push-on nuts, four screws, and two hex nuts.

jbrownmxr · 11-14-2023, 10:16 PM

Quote:

Originally Posted by 71CHEVYSHORTBED402

It works like this. https://scontent-sjc3-1.xx.fbcdn.net...rg&oe=65560872

Short answer is that's operated by selecting INSIDE on your controller. That closes the upper cowl air door, and opens the kick panel door. INSIDE also shuts water circulation to the heater core via the water valve, for 1971-72. OUTSIDE does the opposite, or really, anytime that lever is not on INSIDE, the doors return to their default positions, and the water valve opens water flow to the core.

Pre-71 water valves are a bit different, IIRC. Somewhere around there, sorta

I really can only speak for 71-72.

Ooops, I see the OP is old as dirt. To answer the above question, the kick panel door assm. looks like this from the front. Here's the one at the upper cowl too. Neither are a "switch". They're vacuum operated, really cool stuff, IMO. The images don't show the vacuum lines.

The RH kick panel door assembly for an A/C system includes a recirculated vacuum actuator, two brackets, one return spring with hooks, a link, two push-on nuts, four screws, and two hex nuts.

Perfect! Exactly the pic I needed. Any line on spring and cap nuts.

Also, where’s the water valve and what’s its function?

11-11-2023, 09:21 PM	#26
jbrownmxr Registered User Join Date: Sep 2022 Location: OC, CA Posts: 8	Re: A/C air shut off valve Can someone post a pick of the inside door vacuum switch configuration? Also it has a spring too?

11-12-2023, 01:29 AM	#27
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,129	Re: A/C air shut off valve It works like this. https://scontent-sjc3-1.xx.fbcdn.net...rg&oe=65560872 Short answer is that's operated by selecting INSIDE on your controller. That closes the upper cowl air door, and opens the kick panel door. INSIDE also shuts water circulation to the heater core via the water valve, for 1971-72. OUTSIDE does the opposite, or really, anytime that lever is not on INSIDE, the doors return to their default positions, and the water valve opens water flow to the core. Pre-71 water valves are a bit different, IIRC. Somewhere around there, sorta I really can only speak for 71-72. Ooops, I see the OP is old as dirt. To answer the above question, the kick panel door assm. looks like this from the front. Here's the one at the upper cowl too. Neither are a "switch". They're vacuum operated, really cool stuff, IMO. The images don't show the vacuum lines. The RH kick panel door assembly for an A/C system includes a recirculated vacuum actuator, two brackets, one return spring with hooks, a link, two push-on nuts, four screws, and two hex nuts. Attached Images __________________ Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assm. guide "kit" for restoring it from ground up. With assys, the guide accts for 1000s details such as OEM identifications& part numbers, written in short order. 700+ images include assm, illust., charts, and points of interest. Much of the info. applies to all 67-72 GM trucks, and to a lessor degree all 67-72 GM vehicles. My build thread, and more on the guide https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 11-12-2023 at 02:13 AM.



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