On my jeep heater controls win I swicth them to diff. Positions they stay on floor/ I can watch the acuators move but it dont change got the dash pulled apart to look but lost
Friday, January 28th, 2011 AT 11:28 PM
They use a vacuum articulated system to open/close the blend doors on these vehicles. Use a vacuum pump to check for leaks on the position switch, blend door diaphragms, and lines. Be vigilant.
Saturday, January 29th, 2011 AT 6:44 PM
It sounds like a vacuum leak. Check under the dash as well as the supply line from the engine. If you are lucky, with the engine running, you may hear a hissing sound indicating where the leak is located.