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There is either a problem with vacuum to a actuator for the blend doors or a vacuum problem to the a/c programmer.It is also possible that the a/c programmer "control head" is bad.
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There is actually two blend door actuator that control the opening and closing of your vents. Ine is located under the drivers side dash board. The is on the passengers side. Both are electric and I didnt have the money to replace them so i removed them and turned it with a pliers to allow heat to come out of bothe sides of the vent. Then come summer flip the little bar back the other way to A/C Hope this helps God blessss
Your vehicle uses electronically controlled blend doors to direct th air flow from defrost to vent and to the floor . If the door motor is bad then it will stay at a fixed position so you will not get the air to flow out the defrost ducts. There are at least two of these one for air blend and one for fresh air. They are located on the passenger side usually under the plastic cover and have a wire harness that plug in and are usually shaped like a piece of pie.
there is a vacuum motor that controls direction for air flow. when there is a vacuum leak, the control door defaults to the defrost vent. the motor, vacuum lines and directional control knob must be inspected. most of the time i have found that there is a vacuum line broken. purchasing a repair manual will help locate and discribe the system.
The "blender" would refer to the blend actuators that change the flow of air from floor to vent to defrost or combinations. Properly working blend doors will allow you to direct air to the dash vents, the floor, the defroster, the floor and defroster or the floor and dash vents. If it is not working the heater will still work but you will hae no control oer where the air flows.
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