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CarJunky AutoAdvice

97 dodge caravan wiper, rear wiper, a/c recirc. lights blink for first ten minutes vehicle is on

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Question From buck on 97 dodge caravan wiper, rear wiper, a/c recirc. lights blink for first ten minutes vehicle is on

1997 dodge caravan 3 liter V-6, 163 k miles. The on/off indicator lights for the rear wiper, intermittent rear wiper, recirc and A/C (on the HVAC control panel) blink for about the first ten minutes after the vehicle is started and then shut off. All the functions of the effected indicator light buttons still work. I.e. the rear wiper or A/C will still come on. I have pulled the console out and checked the cicuit board, the motor or arm that runs the vent (near the passenger feet area is clicking a little as it cycles when vent is activated, but A/c seems to work O.K. The problem started suddenly one time as I started the vehicle. I figure it must be an error indicator, but everything still works. computer does not show any related error codes. I have checked all related system mini fuses, all are good. A/c belt was replaced recently( probably unrelated, but I don't know) Chiltons doesn't cover anything related that I can find.

Response From Double J

Sometimes it may just need to be "Relearned"

Click here for procedure to try...Read the different alternatives...

Response From buck

thanks jim. The linked test you sent
worked. The error is "failed cooldown test" the corrective action is to run cooldown test. I have no idea what this is or how to run this test. Please advise

Response From Double J Top Rated Answer

See if any of this helps you!

DIAGNOSTICS
During the Actuator calibration, diagnostics are performed on the actuators and evaporator temperature Fin Sensor. Once diagnostics are completed the REAR WIPER and INTERMITTENT LED's will flash to indicate either a successful calibration or the appropriate fail code(s) At this time manual testing of the Blend, Mode and Driver (if equipped) potentiometers can be performed. If a failure is detected during Diagnostics a fault will be set in the control. When Ignition is cycled OFF and then ON or Diagnostics is aborted, the REAR WIPER and INTERMITTENT LED's will flash simultaneously showing that a failure has occurred. The control will not indicate the fail code, but only that a failure had occurred during the last diagnostics test. The only way to clear the failure codes is repeat the Calibration Diagnostic and Cooldown test, after all repairs are completed.

COOLDOWN TEST
This test has been designed for performance testing of the A/C system at the manufacturing facility. If the HVAC control module is replaced, the Cooldown test will occur during Calibration test. Cooldown will not occur on Heater Only units. During the Cooldown test the control will monitor the temperature of the Fin Sensor. The A/C system must be able to bring the evaporator temperature down a predetermined minimum amount in less than 2 minutes.

CALIBRATION/COOLDOWN LED DISPLAY CODES
See table for definition of flashing LED's. If no problems are found, the control functions normally.

CALIBRATION/COOLDOWN LED DISPLAY CODES
LED'S PASS/FAIL CORRECTIVE ACTION
NO LED'S FLASHING-NORMAL OPERATION PASSED CALIBRATION, DIAGNOSTICS AND COOLDOWN NONE
REAR WIPER AND INTERMITTENT LED'S FLASH SIMULTANEOUSLY FAILED CALIBRATION DIAGNOSTICS RUN CALIBRATION TEST
A/C AND RECIRC LED'S FLASH SIMULTANEOUSLY FAILED COOLDOWN RUN COOLDOWN TEST
REAR WIPER AND INTERMITTENT LED'S ARE FLASHING SIMULTANEOUSLY A/C AND RECIRC LED'S ARE FLASHING SIMULTANEOUSLY FAILED CALIBRATION, DIAGNOSTICS AND FAILED COOLDOWN TEST RUN CALIBRATION TEST

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.
COOLDOWN 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 A/C simultaneously for 5 Seconds
NOTE: Prior to start of test, If the evaporator is already cold, the system will fail test. To correct, operate system with A/C OFF and the blower motor ON high for three minutes prior to starting test.

RESULTS:
All LED's will turn on for 5 Seconds
Cooldown Test is running when A/C and RECIRC. are alternately flashing. If A/C and RECIRC. are flashing simultaneously, Cooldown has failed.
CALIBRATION DIAGNOSTICS AND COOLDOWN ABORT
Test can be aborted by doing one of the following:

Depressing Rear Window Defogger, RECIRC and Rear Wiper buttons.
Cycling Ignition OFF and then ON.
Control will automatically abort after 15 minutes from the time Calibration Diagnostics and Cooldown was entered.
The HVAC control module will return to normal operation or may indicate unsuccessful Calibration Diagnostics or Cooldown test by LED's flashing simultaneously


*************************************************************************************************
A/C and Recirc LED Flashing Simultaneously
FAILED COOLDOWN TEST:

  1. Determine if the refrigerant system is operating correctly:
  2. Check the outlet air temperature
  3. Feel the compressor suction plumbing, is it hot?
  4. If not OK, go to Step 3. If OK, repeat the Calibration Diagnostic and Cooldown test.
  5. If system does not seem to be operating correctly, perform diagnostics for poor performance:
  6. Low refrigerant charge
  7. No charge
  8. 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 three to five 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.