Have Cruise Control But HVAC Vent Control Doesn't Work

ricky bobby

New Member
Original poster
Joined
Jan 4, 2016
Messages
17
Location
Castle Rock, CO
Evening, so I have been cruising the threads and searching for help, but before I give up I wanted to see if anybody else has had this issue. So I am getting the usual HVAC only blowing out the defrost and floor vents. You would say well you must have a vacuum leak, but my cruise control is still working and I can disconnect the line near where it enters the firewall in the engine compartment and I've got suction. I don't have a gauge so I can't really measure how much. I even got a new switch control panel to eliminate that possibility. Though after playing around with the vacuum lines at the switch It appears like I've got no vacuum there. I've checked the blend doors and don't feel anything around there. Has anybody had this issue? Do you know if I could rent a smoke test at an auto parts store? Thanks again for the help on this one.
 
Take a look at the vac lines right near the battery. One comes out of the heater core area, and makes a sharp bend and then goes into a check valve. Mine was cracked there, just enough to have the AC controls not work. Took 5 minutes to replace with new line.
 
Well bought the harbor freight pump, got the wrong size rubber cap believe its suppose to be a 2in one just used tape over the throttle body opener, and a cigar. As I suspected no leaks, but started to again fiddle with things, and what do you know as soon as I am about to give up it starts to work again. Not sure what locked up, but hopefully it doesn't happen again, lol.
 
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