Quailman
NAXJA Forum User
- Location
- Hunt Valley, MD
Hey all, I have had an issue with my '96 XJ Sport for a while now where the HVAC only blows through the defrost vents regardless of what vent setting or blower speed I set the control to.
The only threads I can find suggest a problem with the vacuum canaster. I've tested all that, and from what I can tell, all vacuum lines under the hood are A-OK. I even disconnected the vacuum going to the canaster and plugged it with my finger just to be sure, still only coming through the defroster.
I did delete the Heater Control Valve, and blocked that line off with duct tape (although after checking, the HCV line doesn't have vacuum at all anyways).
I have checked the HCV line, blend door line, and foot vent line (everything I can reach without pulling the kick-plate or the dash out) and can feel NO vaccum pulling on those lines whatsoever, regardless of the vent setting.
A few months ago, I pulled a heater control unit from the junkyard and swapped it in with no change, so I swapped the original back in. I understand that the one I got from the JY could also be faulty, but unlikely.. right? Maybe it's got something to do with my vacuum line "harness" (for lack of a better term) that plugs into the control unit?
Does anyone have other suggestions on what else to check? I would really rather not start pulling the dash apart to get the heater box out unless I absolutely have to.
Thanks in advance!
The only threads I can find suggest a problem with the vacuum canaster. I've tested all that, and from what I can tell, all vacuum lines under the hood are A-OK. I even disconnected the vacuum going to the canaster and plugged it with my finger just to be sure, still only coming through the defroster.
I did delete the Heater Control Valve, and blocked that line off with duct tape (although after checking, the HCV line doesn't have vacuum at all anyways).
I have checked the HCV line, blend door line, and foot vent line (everything I can reach without pulling the kick-plate or the dash out) and can feel NO vaccum pulling on those lines whatsoever, regardless of the vent setting.
A few months ago, I pulled a heater control unit from the junkyard and swapped it in with no change, so I swapped the original back in. I understand that the one I got from the JY could also be faulty, but unlikely.. right? Maybe it's got something to do with my vacuum line "harness" (for lack of a better term) that plugs into the control unit?
Does anyone have other suggestions on what else to check? I would really rather not start pulling the dash apart to get the heater box out unless I absolutely have to.
Thanks in advance!