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You never said if you experienced this driving and if it was universal to all the vents.
Just for yucks pop the cowl cover off, look to the right of the wiper assembly and you'll see the heater control valve. If the side vents are going hot and the center stays cold the valve is opening. Its vacuum controlled therefore you'd want to trace the vacum circuit. Sounds like a vacuum problem to me.
Joe
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Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364
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