Question about Dodge Grand Caravan

2 Answers

The a/c and air recirculator buttons continue to flash on my 1997 dodge grand caravan at the start up of the vehicle, and continue to do so for about 20-25min then they stop - this happens every time you start the vehicle. I've had 2 answers (which contradicted each other, but I tried them both) where I should depress the top/bottom of the 3 leftmost buttons to calibrate the system(one post says on cold, the other says on hot), and this seems to work, but at the end, the a/c and air recirc. continue to flash - any suggestions to make them stop flashing??

Posted by on

  • 5 more comments 
  • romero400 Apr 16, 2009

    followed your instructions step by step - both lights continue to flash (neither of the stopped at any point during the process) - any thoughts?
    thanks for your effort!

  • romero400 Apr 16, 2009

    my 97 dodge grand carivan's a/c and air recirc. lights flash constantly until the van has been running approx 20min, then they stop, but start flashing again if I stop/restart the vehicle. The forum/expert have been very helpful in offering advice, but I have tried exactlly what each has said(see attached comments on bottom) and it doesn't work. The a/c & air recirc contintinue to flash. The tranny was rebuilt in jan (just before I bought it), is this a sign of bigger electrical problems? or do I just need to get used to the disco flashing lights?????
    COMMENTS/REPLIES POSTED:
    [1. Turn vehicle off.
    2. Turn fan knob off.
    3. Turn temperature knob all the way to the left (blue area..
    4. Turn vent knob to panel only setting (next to max. a/c..
    5. Hold down both air re-circulation button and a/c button while turning the key to the "run" position (one short of starting..
    6. Continue holding for 7 seconds until air re-circulation button stops flashing.
    7. Anytime you engage defrost or defrost/heat positions, the A/C will automatically turn on. Press the A/C button to turn the A/C compressor OFF, the light will go out.
    NOTE: If the climate control computer is disconnected from battery power, it will likely revert to factory settings.
    Comment posted on Apr 16, 2009
    All you need to do is start your van. (if you are unsure what knob or lever is which I am looking in the manual for proper terms) Then slide your temp lever all the way to the right (full cold). Then turn the Mode Control to 'panel' (the one that sends air to your face only). Then turn the 'blower switch' to all the way to full. Now go to the leftmost three buttons. Press the top one (rear wiper on constant) and the bottom one (rear wiper washer fluid). Hold these two for a few seconds. Once the lights come on solid then begin to flash you can let go. The AC will now calibrate. You will feel the air blow out of all the different zones at different intervals and see lights come on and go off. Then after a minute or two the top bottn you pressed will be slowly flashing. This means it has been completed (I actually let it run for 5 more minutes just in case something else started blinking). Press the last flashing button and you are done. then turn off the van and started it back up]

  • romero400 Apr 16, 2009

    yes - the a/c works as does everything else(control panel) - (though the lights don't light up until the 2 flashing buttons eventually stop)

  • romero400 Apr 16, 2009

    ok, ran this test (several times) and these lights continue to flash until the vehicle has been running approx 20 min., then they turn off by themselves - 
    Final question - if FIN sensor fault codes are the source of the problem (but the a/c is operational) - do I just live with the  flashing lights? or is this something that needs to be urgently addressed (safety/operation) - I don't feel like getting ripped off at the dealership to stop a little flashing if at the end of the day, that was the biggest part of the problem - make sense???
    Thanks very much for your diagnosis - much appreciated!  sounds like I should get my disco gear ready for my flashy vehicle!! 

  • romero400 Apr 16, 2009

    expensive by guessing at a much bigger problem? or expensive by letting the dealer tinker around until they've maxed out my credit card??

  • romero400 Apr 16, 2009

    my apologies - in no way did I mean to trash talk your profession - I guess I'm just a synic after an EXTREMELY HORRIBLE experience at a Chevy dealer/service shop which resulted in me spending thousands of totally unnecissary dollars! (explaining why I'm doing my homework here first before going to the mechanics')
    Yours and everyones' input is greatly appreciated - I now feel armed with information.  

  • romero400 Apr 16, 2009

    thanks to everyone for their helpful input - I now know that this is something that I could not have easily fixed myself sparing myself huge costs. This is a great site - I will DEFINITELY use it in the future!

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2 Answers

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  • Master
  • 5,158 Answers

1. Turn vehicle off.
2. Turn fan knob off.
3. Turn temperature knob all the way to the left (blue area..
4. Turn vent knob to panel only setting (next to max. a/c..
5. Hold down both air re-circulation button and a/c button while turning the key to the "run" position (one short of starting..
6. Continue holding for 7 seconds until air re-circulation button stops flashing.
7. Anytime you engage defrost or defrost/heat positions, the A/C will automatically turn on. Press the A/C button to turn the A/C compressor OFF, the light will go out.
NOTE: If the climate control computer is disconnected from battery power, it will likely revert to factory settings.

Posted on Apr 16, 2009

  • Roberta Smith
    Roberta Smith Apr 16, 2009

    All you need to do is start your van. (if you are unsure what knob or lever is which I am looking in the manual for proper terms) Then slide your temp lever all the way to the right (full cold). Then turn the Mode Control to 'panel' (the one that sends air to your face only). Then turn the 'blower switch' to all the way to full. Now go to the leftmost three buttons. Press the top one (rear wiper on constant) and the bottom one (rear wiper washer fluid). Hold these two for a few seconds. Once the lights come on solid then begin to flash you can let go. The AC will now calibrate. You will feel the air blow out of all the different zones at different intervals and see lights come on and go off. Then after a minute or two the top bottn you pressed will be slowly flashing. This means it has been completed (I actually let it run for 5 more minutes just in case something else started blinking). Press the last flashing button and you are done. then turn off the van and started it back up

  • Roberta Smith
    Roberta Smith Apr 16, 2009

    if it will not reset using this method it is likely an indication of a problem in the system. does the a/c work ?

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  • Dodge Master
  • 76,630 Answers

These light are flashing because there is problem in the AC control system, the testing is quite envolved but if you wish to try doing the procedure I will lay it out for. Until the problems causing the trouble codes to be set are cleared the lights will continue to flash
1st here is a difinition of the flashing lights
the a/c and air recirculator - dccf7a6.gif

Ok you have a cool down test failure. so read on.

COOL-DOWN 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 Cool-down test will occur during Calibration test. During the Cool-down 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.

Posted on Apr 16, 2009

  • 4 more comments 
  • yadayada
    yadayada Apr 16, 2009

    Continued:



    To enter diagnostic self test of the system do the fiollowing and record the codes.



    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. Cool-down test is running if A/C and RECIRC are alternately flashing.
    • Acceptable result is REAR WIPER LED is the only LED flashing. Push Rear Wiper to exit.
    • After all tests have passed, Calibration Diagnostics and Cool-down can be run separately.

  • yadayada
    yadayada Apr 16, 2009

    This testing will end up with a trip to the dealer to repair the fault.

  • yadayada
    yadayada Apr 16, 2009

    Your problem is most lkiely caused by either a sensor at the evaporastor core called a FIN sensor malfunctioning or a blend door motor control problem, the blend door motor is not accesiable unless you remove the entire dash assembly.



    IN CLOSING REMEMBER UNTIL THE FAULTS ARE REPAIRED THE LED'S WILL CONTINUE TO FLASH, IF THE FAULT(S) IS NO LONGER PRESENT RUNNING THE SELF TEST WILL CLEAR THE FLASHINGS LIGHTS, IF STILL PRESENT THEY WILL START FLASHING AGAIN. RUN THE SELF TEST I OUTLINED ABOVE, U HAVE NOTHING TO LOOSE.

  • yadayada
    yadayada Apr 16, 2009

    Run the AC control system self test as outlined above, everything I have given you is correct.

  • yadayada
    yadayada Apr 16, 2009

    it is not a safety issue, just an annoyance issue, there is a fault still present or the lights would have shut off after the test, without further diagnostics by the dealer from here on out you would be guessing, that gets expensive real fast.

  • yadayada
    yadayada Apr 16, 2009

    Being a dealer tech for 30 years tinkering is not what I do, at least I hope not, I fix most everything I work on, this one sounds easy once the shop runs the proper tests, remember dealers do just your line of car, there techs are factory trained and very good at what they do, the dealer has to have around $200,000 in special tools and test equip for your car, can a outside shop afford that, in most case's no way.

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