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The following is gleaned from the T&C '97 Factory Shop Manual.
It should apply to all '96-UP minivans:
With engine on, set blower motor to high, set mode position knob to
panel
(i.e. full left), open all A/C outlets, set temperature to cold (both
levers
if so equipped).
Now press the wash and rear wiper buttons on the A/C panel simultaneously
for 5 seconds (until all LED's light). This should get the test
started.
Assorted lights on this panel will flash as different tests are run.
Eventually if the tests are passed the rear wiper LED should be the
only
light flashing. Push the rear wiper button to exit test mode
and you should
be home free.