Does your mustang have vacum or electric control. If vacum, pull out controll and check if all the vacum lines are connected. Or if there are any cracks in the line. Check both ends of the line, where it connects to the control and up to the heater box.
Testimonial: "It was in fact a vacuum line under the hood on the firewall, the line was taught and had cracked and broke off due to the hard angle it was being pulled in. A/C is good as new now. "
They're electric, you're pretty sure it's a problem with the controls?
Check vent door motors. If you can see the motors on the air box, you should be able to see somthing spining when you adjust contol. If it works check to see if ducts are secured. Or maybe a mouse got in there and blocked duct with debree.
Yeah the air box looks good and although I can't feel up there I cant imagine those hoses would have enough room to work loose, the vents were flowing fine this morning; since the controls work for everything else I'm thinking there must be an obstruction too. Thanks for your help, when I get it fixed I'll post the cause.
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