Also when u turn heater on floor and vents it idles up and when u put it on defrost and floor also have hesitaton when driving
Throttle body area needs cleanin-and also idle control motor---tps sensor cud hav issues-its in same area-----do a code scan of vehicle for more info
SOURCE: 1998 Mustang - AC blows only through Defrost vents
You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.
SOURCE: heater and ac vents
You have a vaccum leak on the mustang. Unsure of the Contour.. I believe it is the middle hose where the three fittings are (right in front of the driver seat in the engine compartment) Mustangs are notorious for vaccum leaks there
SOURCE: PROBLEM WHEN SELECTING THE DIRECTION FOR THE AIR
Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.
SOURCE: 2002 Ford Explorer When turned to defrost air
sounds like your door blend actuator which is under the dash and a pain to replace
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