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What year is your truck? On my ' you pull the front of the dash off where the switches are (should be a couple of screws) and behind the switches s a whole cluster**** of tubes and cables. Make sure they are all hooked up properly, it fixed the same problem for me.
 

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when you ,ove the selecter from defrost to heat to bi, it can either be the switch on the dash, no vacume to the switch. when the selector on mine quite this year i had broken the clip on the dump valve in the heater. i just made a new bolt and bolted the stupid thing back together
 
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