SchneiderFishing Posted May 21, 2009 Share Posted May 21, 2009 Every time I accelerate, even just a little, the heat or the air stops blowing from the dash and only blows through the window defrost vents in the top of the dash by the front windshield. Any ideas? 1990 Comanche 4.0 Column shift 4 wd Link to comment Share on other sites More sharing options...
aemsee Posted May 21, 2009 Share Posted May 21, 2009 You have a loss of vacuum to the heater control head. Defrost is the default position for safety. Follow the vacuum lines from the engine to the firewall and down to the vacuum canister. Link to comment Share on other sites More sharing options...
Pete M Posted May 21, 2009 Share Posted May 21, 2009 Yup. Sounds like a vacuum issue. The most common failure points in the system seems to be the vacuum lines as they enter the vacuum canister (which is located inside the front bumper on the passenger side). :thumbsup: Link to comment Share on other sites More sharing options...
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