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First i would the vacuum source,at the intake manifold. Are there any other problems, like air bag lite on,door locks not locking at 18 mph or no overdrive?
Cruise and ac are both connected in one way. Vacuum controls the blend door and mode door in your HVAC system. If you lose vacuum to your HVAC system it will default to heat and defrost.
Are they mechanical on the later models D's? Mines vacuum controlled for the recirc and mode door. IIRC the blend door is mechanical on mine still. Hmmmm I was tired last night.