My 94 855 turbo is going back to an independent garage for the third time this coming week. they installed a new evaporator but the auto climate control has problems fault codes were 122,324,416,417,418,419,511, after cleared, 324 keeps coming back plus others. its really nutty sometimes no air flow through center ducts at all, other times hot on left and ice on right heat at floor when ac is at max etc.wacky! they say they think the 324 damper motor active too long, is the problem ,like maybe is jamed or something, but they are going to pull the dash out again at n/c of course I think maybe they have some wire connectors swaped. any Ideas?