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

Tiny
WELCH690
  • MEMBER
  • 1995 GMC SONOMA
  • 2.2L
  • 4 CYL
  • 2WD
  • MANUAL
  • 224,168 MILES
Where the vacuum line goes through the firewall.
Wednesday, April 3rd, 2024 AT 8:14 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,772 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.
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Wednesday, April 3rd, 2024 AT 7:00 PM
Tiny
WELCH690
  • MEMBER
  • 2 POSTS
Diagrams are unclear?
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Friday, April 5th, 2024 AT 10:14 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 44,209 POSTS
Here are more which is what AllData gives us. Check out the images (below). Let us know if you need anything else.
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Friday, April 5th, 2024 AT 10:19 AM

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