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Yes you can detect each change in speed no blockage that i can see , and the air comes out equally of all the vents floor and vent and defrost, im stumped- all i can guess is that there might be a check valve that i cant locate

85 manual heater/AC controls, in any mode, heat-vent-defrost- equal amonts of air flow thru all vents , floor, defrost and vents, I pulled out control unit and all vac lines appear to be in place and none are cracked or brittle, is there a check valve anywhere that I am missing like on the newer...