My SD has the same no heat driver, heat in passenger footwell. So far can live with it. Will dig at it later.
But, it may not be the only culprit. With no air out of the footwells, the problem could be the CCU, but is more likely to be a vacuum switchover valve , the vacuum pod, or the linkage from the pod to the footwells. Right now, the SD has no driver's footwell air.......but it does have passenger footwell air........go figure.......[/quote]

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83 SD

84 CD