AC/Heat vacuum selector valve part #

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Black gold

Junior Member
Joined
Dec 8, 2023
Posts
13
Reaction score
8
Location
usa
First Name
shane
Truck Year
1986
Truck Model
c10
Engine Size
305
You must be registered for see images attach
What’s the part number for this? 1986
 

Craig 85

Full Access Member
Joined
Jan 25, 2017
Posts
3,892
Reaction score
4,031
Location
Nashville, TN
First Name
Craig
Truck Year
1985
Truck Model
K30 SRW
Engine Size
454/TH-400/NP205
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.

You must be registered for see images attach

You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
 

84GMCSierra

Full Access Member
Joined
Feb 26, 2023
Posts
302
Reaction score
355
Location
Central Arizona
First Name
Paul
Truck Year
1984
Truck Model
C2500
Engine Size
350
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

Full Access Member
Joined
Jan 25, 2017
Posts
3,892
Reaction score
4,031
Location
Nashville, TN
First Name
Craig
Truck Year
1985
Truck Model
K30 SRW
Engine Size
454/TH-400/NP205
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

Junior Member
Joined
Dec 8, 2023
Posts
13
Reaction score
8
Location
usa
First Name
shane
Truck Year
1986
Truck Model
c10
Engine Size
305
Craig 85. Where did you buy the assembly? I bought one from LMC and it did not have the switch.
 

Black gold

Junior Member
Joined
Dec 8, 2023
Posts
13
Reaction score
8
Location
usa
First Name
shane
Truck Year
1986
Truck Model
c10
Engine Size
305
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.

You must be registered for see images attach

You must be registered for see images attach
You must be registered for see images attach
Where did you purchase the assembly?
 

1lejohn

Full Access Member
Joined
May 14, 2012
Posts
180
Reaction score
353
Location
texas
First Name
john
Truck Year
1985 , 2004
Truck Model
k-1500, 2500 HD
Engine Size
350, 6.7
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

Full Access Member
Joined
Jan 25, 2017
Posts
3,892
Reaction score
4,031
Location
Nashville, TN
First Name
Craig
Truck Year
1985
Truck Model
K30 SRW
Engine Size
454/TH-400/NP205

Forum statistics

Threads
42,013
Posts
907,437
Members
33,510
Latest member
dstack12
Top