QuestionQUESTION: I have a 1996 Chrysler town & Country LXi. The A/C needed charged so I did. While the blower works fine, air only comes out at the floor and I believe some at the defrost. The rear blower works fine. The blower speed switch works fine but the knob next to it that adjusts from dash vents to floor or defrost and some mixes of those does nothing when I turn it.
One thing I have noted is that it seems as though the amount of air coming out on my feet varies. For example when I let off of the gas and step on the brake, it seems as though the air increases on my feet. This may just be my imagination but I also thought that it might be vacuum related.
I'm not sure if the controller on the dash is the problem or the part of the plenum that directs the air, or a vacuum leak or something I haven't even thought of yet. I don't really know where to start.
Thanks in advance for your help
George
ANSWER: Sounds like the mode door actuator has packed it in. Very common problem and a fairly easy repair. To verify this follow these instructions... Lower glovebox and make sure harness did not get pinched. I have seen this happen twice.
1. Check the 5 volt reference on the Pink/Dark Blue wire in pin 9 of the heater control.
2. Check for B+ on the Black/Orange wire in pin 10 of the heater control.
3. Check for a good ground on the Black/Light Green wire in pin 21 of the heater control.
4. Check the voltage across the Dark Green/Yellow wire and the Dark Blue/White wire while doing the calibration test.
5. If the powers and grounds and the 5 volt reference is OK, but no voltage across the two wires in step 4, the control is faulty.
Hope this was helpful
Wayne
---------- FOLLOW-UP ----------
QUESTION: 1. Check the 5 volt reference on the Pink/Dark Blue wire in pin 9 of the heater control.
I think this is fairly clear... I assume from the pink/dark blue to ground and I am looking for 5 volts dc
2. Check for B+ on the Black/Orange wire in pin 10 of the heater control.
Not sure what B+ means.
3. Check for a good ground on the Black/Light Green wire in pin 21 of the heater control.
Continuity from black/light green to ground
4. Check the voltage across the Dark Green/Yellow wire and the Dark Blue/White wire while doing the calibration test.
What calibration test?
5. If the powers and grounds and the 5 volt reference is OK, but no voltage across the two wires in step 4, the control is faulty.
AnswerQUESTION: 1. Check the 5 volt reference on the Pink/Dark Blue wire in pin 9 of the heater control.
I think this is fairly clear... I assume from the pink/dark blue to ground and I am looking for 5 volts dc
Correct!
2. Check for B+ on the Black/Orange wire in pin 10 of the heater control.
Not sure what B+ means.
B+ is schematic terms for battery voltage. 12.6V approx in your case, 13-14 when running.
3. Check for a good ground on the Black/Light Green wire in pin 21 of the heater control.
Continuity from black/light green to ground
Correct!
4. Check the voltage across the Dark Green/Yellow wire and the Dark Blue/White wire while doing the calibration test.
What calibration test?
The calibration test (pressing the corrosponding buttons to self test and aligning the motors/checking them for opens and shorts. Have you not done this?
5. If the powers and grounds and the 5 volt reference is OK, but no voltage across the two wires in step 4, the control is faulty.
