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Hey Guys- 2013 1500 bighorn - Recently replaced my heater core and evaporator, also put in cabin filter mod. After getting my ac recharged everything was fine for a week or so now every so often upon start up my heat will only be on the floor and won’t respond to any commands (hot/cold/vent/floor). Only thing that responds is blower speed.
If I take off the battery cables it will often fix the issue and reset it. Had the dealer do a calibration, this worked for a couple days and it happened again. Replaced my control module behind the globe box, hasn’t solved it. Tired of throwing money at it. Any ideas? My thought was if it was a blend door issue it wouldn’t be intermittent like this, for sometimes a week without happening.
 
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