Climate controls interchangeable?

["TM" <mizutanit@mindspring.com>]

Hi,
I was wondering if you can interchange the earlier '84-86 climate control
systems on the 5k with the later '87-91 units. The reason I ask is because
I may be able to get a unit from an '88 that works to replace my possibly
bad programmer module. If all I need is the module, and it works with the
older head unit, then I'm all set. If not, I wonder if the wiring will plug
right into the newer units. Anyone tried this?

Taka Mizutani
'86 5kcstq in need of operational climate control, along with other things