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typ44TQ: rpm's kick up whenever climate control turned on?

on my '86 5kTQ, whenever i turn on the climate control (both heater or the 
a/c affects this) the rpm's kick way up, and only go back down to normal when 
i shut off the climate control.  its more apparent when idling in neutral.

normal rad. fan temp operation doesnt affect this, it just happens when i 
turn on the a/c or heater.
any ideas?
'86 5kT, TQ