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I have an 89 bronco XLT my heat and air conditioning blow out of the defrost vents up by my windsheild but not the vents on my dash any advice
 

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NJDevil1331 said:
I have an 89 bronco XLT my heat and air conditioning blow out of the defrost vents up by my windsheild but not the vents on my dash any advice

That is the default condition if you lose vacuum to control the vacuum motors. The vacuum line originates at the main vacuum tree on the intake and goes to a check valve then to the vacuum reservoir and Air controlls. See picture attached.
 

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