AC/Heat vacuum selector valve part #

[Black gold]

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What’s the part number for this? 1986

 

[Craig 85]

I couldn't get one for my '85 a few years ago and had to buy the whole control. Last photo has the exploded part numbers. Look at #6.

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[84GMCSierra]

I wonder if I need one of these to get my defroster to work? It worked when I bought the truck in 2019 but it stopped but the regular heat works. I pulled all the AC components out except for the box on the firewall to clean the engine etc, so not sure if it works yet.

 

[Craig 85]

I wonder if I need one of these to get my defroster to work? It worked when I bought the truck in 2019 but it stopped but the regular heat works. I pulled all the AC components out except for the box on the firewall to clean the engine etc, so not sure if it works yet.

I think if that valve fails it defaults to the floor or defrost. I can’t recall. I bought one of those cheap vacuum testers to make sure all the vacuum pods worked. When I determined they did, it led me to the valve being the issue.

I know the complete control assembly was under $200 when I bought it.

 

[Black gold]

Craig 85. Where did you buy the assembly? I bought one from LMC and it did not have the switch.

 

[Black gold]

I couldn't get one for my '85 a few years ago and had to buy the whole control. Last photo has the exploded part numbers. Look at #6.

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Where did you purchase the assembly?

 

[1lejohn]

Good luck finding a new unit. I got lucky and found a new in the box GM unit last year. It took many searches to find one. I got the last one from them. I had issues with the plastic, rubber, socket that the vacuum lines plugged into. The part that goes on the switch #6. I found one at the junk yard that was in better shape. It fixed most of my problems. The heat blows out of the bottom the AC out the vents , the defrost not so much.

 

[Craig 85]

Craig 85. Where did you buy the assembly? I bought one from LMC and it did not have the switch.

I got mine through the Parts Place. It's $289 now. If you get one off ebay, just make sure it's an NOS unit in the box.

https://www.thepartsplaceinc.com/pr...-c-chevrolet-and-gmc-trucks-gm-16034591/66601