Well I think it is probably the vacuum switch. It selects between different vacuum solenoids that open doors to let air flow in. So if the switch is broken it won't switch the solenoids to close the defrost and open the main vents. My topaz did this.
ATX MTX swap, rear drum disc swap, drilled rotors, ported intake, optim throttle body, CAI, 7.5L MAF, adj. fuel regulator, longtube headers, underdrive pulley, no EGR, low inpedence bigger injectors, 2002 Focus Swap
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