512tr Posted February 27, 2007 Share Posted February 27, 2007 On my -87 MJ w/o AC, I have hot air through the defroster and when switching to the floor the air is cold. Have checked all vacuum motors controlling the vent doors, and the water valve….. they are all working good. Have also checked the cable that operates the heater control valve (blend door) and it works as it should. Have not open the housing yet, would check if any of you have experienced the same problem, before I tear it all apart ? Could the problem be that the blend door is leaking in warm position, so some of the cold air is NOT going through the heater core? Link to comment Share on other sites More sharing options...
carnuck Posted March 2, 2007 Share Posted March 2, 2007 Check the vacuum motor right above the gas pedal. I knocked the hose off mine and that's exactly what it did! Link to comment Share on other sites More sharing options...
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