A/C Selector?

Tiny
RICHARD SMITH6
  • MEMBER
  • 1998 FORD MUSTANG
  • 3.8L
  • V6
  • 2WD
  • MANUAL
  • 121,000 MILES
I've put a vacuum smoker on the system and found two small leaks at intake manifold and repaired a rechecked. No more leaks were found in the engine area. Never saw or smelled a leak under the dash. The selector works in every position except vent or A/C. I'm starting to think the switch itself may be bad. Still trying to figure it out.
Friday, October 27th, 2023 AT 4:25 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
What seems to be the problem? Does the A/C not work? Vent control?
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Friday, October 27th, 2023 AT 8:44 AM
Tiny
RICHARD SMITH6
  • MEMBER
  • 27 POSTS
A/C not working was already a known issue, the current issue is the selector switch works in all positions (you can hear and feel blend doors moving) except in vent or A/C positions it still only comes out defrost and floor vents. No vacuum leaks were found under the dash using a smoker. Plan on replacing the A/c compressor / dryer etc, in spring (don't need it now).
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Friday, October 27th, 2023 AT 9:46 AM
Tiny
KEN L
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  • 47,256 POSTS
It sounds like the air damper door is no working or you have a vacuum leak under the hood that feeds the HVAC system. Please go over this guide and check the images below to se what I am talking about:

https://www.2carpros.com/articles/air-vents-stay-in-the-defrost-position

Here is a guide to how the vacuum lines work and are routed so you can check them out. Check out the images (below). Please let us know what happens.

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Wednesday, May 8th, 2024 AT 11:59 AM

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