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Questions and Answers

Plymouth Voyager Only Blows Hot Air

Q. Good Afternoon, I have a 1996 Plymouth Voyager with a 3.3 liter engine. The air will not turn on. When you turn on the vent or defrost the air coming out is very hot regardless of where the temperature control is set. I have checked the pressure in the A/C lines and they are with in range.

Plymouth Voyager Only Blows Hot Air

Could the temperature control module be bad? What should I check? Is there an electric solenoid in the heater circuit that turns the flow on and off at the heater core? Where should I go first?

Lou

A. Since you didn't say if you have a manual HVAC or automatic HVAC, I'm going to assume you have the automatic HVAC since it is, somewhat, more common and more prone to problems than the manual HVAC. Here is the procedures.

Fail Codes/Level are displayed using the REAR WIPER and INTERMITTENT LED's flashing in the sequence indicated below. The REAR WIPER LED represents the Level and the INTERMITTENT LED represents the Value.

Fail Codes/Level are displayed using the REAR WIPER and INTERMITTENT LED's flashing in the sequence indicated below. The REAR WIPER LED represents the Level and the INTERMITTENT LED represents the Value. After Calibration/Diagnostics is completed, the control will begin flashing Level 1 codes. Depressing the WASH button will cycle to Level 2, depressing WASH again will cycle to Level 3. Each time the WASH button is depressed will cycle to the next level. After Level 5 is reached, you will cycle back to Level 1. If the Control is a Heater Only you will only cycle from Levels 1 to 3.

Plymouth Voyager Flashing A/C Lights

Plymouth Voyager Flashing A/C Lights

The possible codes are:

  • Rear Wiper LED Flashing Once, Int. LED Not Flashing
  • Rear Wiper LED Flashing Once, Int. LED Flashing Once
  • Rear Wiper LED Flashing Once, Int. LED Flashing Twice
  • Rear Wiper LED Flashing Once, Int. LED Flashing Three Times
  • Rear Wiper LED Flashing Once, Int. LED Flashing Four Times
  • Rear Wiper LED Flashing Once, Int. LED Flashing Five Times
  • Rear Wiper LED Flashing Once, Int. LED Flashing Six Times
  • Rear Wiper LED Flashing Once, Int. LED Flashing Seven Times
  • Rear Wiper LED Flashing Once, Int. LED Flashing Eight Times
  • Rear Wiper LED Flashing Once, Int. LED Flashing Nine Times

Once we know what the codes are, we can work from there.

A/C and Recirc LED Flashing Simultaneously:

FAILED COOLDOWN TEST.

  1. Determine if the refrigerant system is operating correctly:

    • Check the outlet air temperature

  2. Feel the compressor suction plumbing, is it hot?
  3. If not OK, go to Step 3. If OK, repeat the Calibration Diagnostic and Cooldown test.
  4. If system does not seem to be operating correctly, perform diagnostics for poor performance:

    • Low refrigerant charge
    • No charge
    • Compressor not operating

COOLDOWN TEST:
Verify that the test was done with the evaporator at room temperature. The test consists of starting the compressor and measuring the time it takes for the evaporator temperature to fall 20°F. If the compressor has been running, the evaporator is cold already and will not be capable of falling 20°F.

If the test was run with a cold evaporator, turn A/C off and turn the blower motor switch to high position for 3 to 5 minutes till the evaporator is to room temperature. Then repeat the Calibration Diagnostic and Cooldown test.

WON'T PASS COOLDOWN TEST:
If refrigerant system is performing properly and the system will not pass test. Repeat the Calibration Diagnostic and Cooldown test to determine if the evaporator temperature FIN sensor has developed an open or a short circuit. If the HVAC control module still passes Calibration test, verify Cooldown test manually with a pocket thermometer.

The outlet air temperature must drop at least 20°F within two minutes. If the vehicle passes with the manual thermometer, take HVAC control to level 4 (evaporator probe temperature readout) and repeat the Cooldown test. Ensure the evaporator is at room temperature before starting test. Check if evaporator probe will drop the temperature 20°F in two minutes.

If the Evaporator Probe is found to be faulty, check that the sensor is positioned in the evaporator fins properly. If not, correct and repeat test. If okay, replace the evaporator probe.

Once the repairs are completed, repeat the Calibration Diagnostic and Cooldown test. Repeating the test is necessary to clear the fault codes.

Additional Information provided courtesy of AllDATA

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