HVAC selector controls are not working, only the floor and defrost?

1995 GMC SONOMA
224,168 MILES • 2.2L • 4 CYL • 2WD • MANUAL
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WELCH690
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  • 2 POSTS
Where the vacuum line goes through the firewall.
Apr 3, 2024 at 8:14 AM
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JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

I believe you will find it on the driver's side of the firewall. I attached a pic of the supply under the hood that goes to the HVAC. See if it helps and let me know. Also, pic 2 is the schematic for under the dash.

Take care,

Joe

See pics below.
Apr 3, 2024 at 7:00 PM
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WELCH690
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  • 2 POSTS
Diagrams are unclear?
Apr 5, 2024 at 10:14 AM
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STRAILER
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  • 54,189 POSTS
Here are more which is what AllData gives us. Check out the images (below). Let us know if you need anything else.
Apr 5, 2024 at 10:19 AM