No heat - Dodge Caravan 1997, 3.3l V6
I also have heating problems.
Beginning at least a year ago, sometime would get no heat regardless of the position of the temperature slider - or sometimes 100% heat, and I'd have to turn on and off the fan to maintain a comfortable temperature. Sometimes it would go back to normal operation where I could control the temperature.
The AC needed a recharge shortly after I bought the van used so I just pulled the fuse from the AC clutch because in defrost position the AC comes on whether the temp is on hot or cold, summer or winter. I guess it was designed that way to dehumidify the defroster air.
Sometimes just driving with nothing on (no heat or AC), I hear the servo motor running?? I expect this is indicative of problems.
Now all the heater fan speed controls do not work, other than full - no problem, I understand the resistors go.
Someone also indicated another problem I used to have last winter... I had to turn the fan on high to get the door / deflector to "Thump" closed, then I would have heat until I turned off the vehicle. Now however I can't get it to "thump" closed anymore so I have not heat directed into the cabin.
The controls to direct air to the face, feet and defroster vents work - just no heat.
I ran the diagnostic today (by holding the Wiper and the Wash buttons at the same time). First time I ran it I didn't turn on the fan which I later read I should do. The first results ended in the indicator lights cycling between the Wiper Light flashing 1 time, and the Intermittent Wiper light flashing 4 times. When done the system indicated an error by flashing both these lights when I turned on the car and this condition would not clear until I re-ran the test as below.
After further reading, I later re-ran the test as suggested with the FAN on FULL, the TEMP on COLD and the Selector on FACE. It Ran now with only the Wiper Light giving me a single flash and kept repeating this. This time when I pressed the wiper button, it successfully terminated the diagnostic test with no lights left on.
* Anyone know what the single blink means? *
I'm suspecting like F150 noted, I broken nipple connected to an actuator or something like that...
I do not suspect a heater core, a thermistat or insufficient coolant.
I suspect a mechanical or electrical issue in the dash.
Anyone have any suggestions?
Thanks in advance.