73 Mach 1 HVAC Control with factor AC

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Joined
Jul 1, 2023
Messages
94
Reaction score
69
Location
Shepherdsville Ky
My Car
1973 Mustang Mach 1 Q code AC 4 speed
I've been pulling my hair out trying to figure out how the heat/cool lever can work backwards on this. I move the lever to heat and it blows cool and when I
move it to cool, it blows warm. As far as I can tell, this is only controlled by a single cable that goes to a lever on the heater box. Vacuum has nothing to do with
this function correct? I've attached pics of how it's set up currently. The pic on the left is with the lever moved to heat and the right is to cool .
 

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