weird vacuum issue?
#12
Did you check the inlet line to the HVAC control for vacuum? Is it holding vacuum? Can you manually operate (and hold) each of the 3 vacuum motors (with a hand pump)? If you have all that, then its move likely the control head going out.. I think you are losing engine vacuum, most likely from the check valve under the hood. I'd start there
Thread
Thread Starter
Forum
Replies
Last Post
mungodrums
S550 2015-2023 Mustang
10
09-28-2015 10:54 PM
LivingInThePast
Classic Mustangs (Tech)
2
09-16-2015 12:20 PM
TfcCDR
V6 (1994-2004) Mustangs
1
09-14-2015 12:08 PM