I sold the car this way But just get the HVAC position switch on the dash from a wrecking yard and swap it in. Make sure that the switch is getting vacuum when the engine is on cus this could also cause the problem.

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