1997 dodge caravan 2.4 engine

Why is my lights keep blinking on my heater and ac panel. help!

 

This was posted because sometimes light flash; however, the test described
below should also recalibrate the system. If the system doesn't pass the
tests, lights will flash. Good luck:

Hi all, I posted this over a year ago and I've reposted
it from time to time. Here it is again:

This is a relatively common problem that has shown up a number of times in
this newsgroup. I've posted this a number of times and I've received some
replies that have indicated that this works. A dead or disconnected battery
can do this. Somehow the
battery discharge and recharge must have somehow caused your
HVAC control panel to enter diagnostic mode or
there may be some problem in the system. Even if you haven't had an
electrical problem, somehow your HVAC panel has gone into diagnostic mode.
I don't think it is likely to be a
problem in the system. The HVAC system has built in self
diagnostics. The blinking you are seeing indicates that somehow the
diagnostic test was run successfully, or that there is a failure in the
system. I would suggest running the HVAC test yourself and then resetting
the system. If there is still a
problem then you can go further. The following is gleaned from my T&C '97
Factory Shop Manual.. I think the procedure is the same on your model.

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.