How many inches of vacuum is there supposed to be on the vacuum supply line that goes from the carb to the heater control? I have 14 but my heater controls don't work right.
74 Challenger.
The heater control draws vacuum from a fitting on the back of the intake manifold, not the carb
https://themoparshop.com/shop/1-8-1-4-auxiliary-port-pb-vacuum-hose-fitting/
in my '73 service manual they say 8-inches of vacuum to test operation of the A/C controls and shouldn't drop more than 3/4 of an inch when a function is selected but should return to 8-inches.
Link to MYMOPAR service manual downloads.
https://mymopar.com/service-manuals/
Quote from: MoparLeo on September 21, 2024, 02:36:22 PMThe heater control draws vacuum from a fitting on the back of the intake manifold, not the carb
https://themoparshop.com/shop/1-8-1-4-auxiliary-port-pb-vacuum-hose-fitting/
Yes you're correct. My slip up.
The link is good for service manuals. Lots of good info.
I am glad you got it figured out.