Chrysler Repair: ac/heater control test: 2003 Voyager, slide pots, dodge repair

Question
The heater in my wife's van is not putting out any heat. Both heater hoses going to the heater core are hot.It seams to me that it is not switching from cold to hot air, any ideas? Thanks Ray

Answer
Hi Ray,
While I don't have manuals for mini-van vehicles like yours later than '98, the heater/ac control systems appear to be unchanged. Basically, these have built-in calibration and self-diagnostic capabilities that should be exercised before you do anything else. The other Chrysler expert, Kevin, a couple of days ago posted on the Dodge repair category a brief summary of how to initiate the process and what to expect to happen. I paste these:

CALIBRATION/DIAGNOSTICS TEST ENTRY
TO INITIATE TESTS:
Set Blower motor ON HIGH
Set Mode position to Panel
Open all A/C outlets
Set Temperature to Cold (Both slide pots if equipped)
Depress WASH and REAR WIPER button simultaneously for 5 Seconds (Until all LED's light)
RESULTS:
All LED's will turn on for 5 Seconds
Calibration Test is running when REAR WIPER and INTERMITTENT are alternately flashing. Cooldown test is running if A/C and RECIRC are alternately flashing.
Acceptable results is REAR WIPER LED is the only LED flashing. Push Rear Wiper to exit.
After all tests have passed, Calibration Diagnostics and Cooldown can be run separately.  

The calibration may solve your problem. If not, the flashing of the lights on the control panel will give a clue as to what is the problem. The air temp is controlled by a small motor that directs the air between the ac coil and the heater coil in varying amounts and then makes adjustment in response to themperature readings. That motor could be faulty, or the control of it may be, but only the test above would either solve it or give you some direction. Let me know either way if you would like. You can use the "thank/rate" tab below to get back to me without having to wair for me to be 'available' for a question.
Roland