Iffy compressor operation can also be a slipping belt, which kicks out
the KLIMA til restart -- easy enough to check, cycle the keyswitch and
it will come back for a while.
Sadly, this can also be a bad compressor dragging when it's hot, I've
had that happen to me. Easy change if you can find a good one, but
get a filter put into the suction side hose if you replace it.
Center vent is probably a vacuum issue, make sure you don't have a
leak in something else up in the engine compartment that prevents full
vac at the supply for the ACC. Also check the switchover valves and
associated elbows.
A shot of contact cleaner into the temp control wheel rheostat can
work wonders too.
Verify that all the temp sensors are good -- a bad on at the
evaporator that goes open when cold will shut the AC off too.
Peter
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