bjfox1970 Posted March 13, 2019 Share Posted March 13, 2019 (edited) I've torn into the dash try and get the HVAC back up and running. I've noticed quite a bit of vacuum noise coming from this switch when its in any position other than the HEAT position . I pulled it apart and it appears that there is a passage to atmosphere. It is supposed to operate like this??? I cleaned the switch and applied some high vacuum grease. Everything else looks OK. Edited March 13, 2019 by bjfox1970 (see edit history) Link to comment Share on other sites More sharing options...
VickyBlue Posted March 16, 2019 Share Posted March 16, 2019 My 69 did the same thing. Full heat (right stop of the lever travel) would hear a light hissing noise. Once I moved the lever 1/4 " to the left (cold) it would stop. I adjusted the Bowden cable that connects the heat lever to the heater control valve and it fixed my problem. Link to comment Share on other sites More sharing options...
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