Blower Motor shuts off when heat is selected

[AdamandGreyson]

Alright so blower motor works at all 4 speeds without issue. The second I move from cold to hot on the selector, blower motor stops running. Move back to cold far starts back going….Also note the factory AC is currently out of the truck (purchased this way but have the parts). Anyone else had this odd issue?!? Maybe I am missing something very simple. Thank you

 

[gmbellew]

The temperature control is a cable mechanism that physically moves a flapper. If it is affecting motor operation, the cable must be physically in contact with a wire somewhere? You will have to take the glovebox out and watch things as you move the temp slider around.