Question about 1998 Chrysler Town & Country

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Heating/Air conditioning Control

When I start the van, all the push button lights on the temperature/rear wiper control start blinking. Sometimes they go out after several minutes and sometimes they don't. When I try and use the A/C I get hot air from the right hand vents, and ambient temperature air from the left vents. Checked under the hood, and the compressor is "on". How do I troubleshoot this problem?

Bill

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  • Anonymous Jul 19, 2008

    wiper,a/c, recirculate switchs blink .after 15 min. they stop blinking untill you turn ign. key off and the restart motor then blink for another 15 min. everthing works when they blink. just hard to tell if on or off. Thank you Tom

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Hi to get the lights to stop flashing this is with you have to do he reason they are on is beacuse the battery has been removed at one time ok this is the was to get them to stop flashing. first start the vanthen slide the temputer lever all the way to the right then set the mode control to panel (this is the mode that send air to your face)then put the fan speed to full power now go to the leftmost three buttons press the top one(rear wiper on constant) and the bottom one(rear wiper hold thest 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 air blow out of all the vents at different intervals and see lights come on and off then after a minute or two the top button you pressed will be slowly flashing this means it has been completed but let it run for a few minutes more to make sure nothing els flashes then press the last flashing button then your done if you need more help email me rockystevenson@hotmail.com

Posted on Feb 01, 2009

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My 2005 Town and Country has a problem with the air conditioning and heat in the front we changed the blower but still have the problem what to do next ??????

Posted on Feb 08, 2009

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Topic: Chrysler Repair
Expert: Roland Finston
Date: 3/8/2006
Subject: 99 Chrysler Town & Country Limited blinking lights on dash

Question
My 1999 town & country limited has 4 blinking lights on the dash (rear defrost, air recirc, rear wiper, and intermittent rear wiper) that blink for exactly 15 minutes after starting the engine and driving the vehicle. Then they go off unless that feature is being used. They also work fine anytime, blinking or not. Nothing else seems to be wrong and the van is driving fine. I have tried disconnecting the battery, both terminals, but the blinking still happens every day. What is my van trying to tell me?

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Answer
Hi Steve,
A similar question came in earlier this year. Another owner contributed some information about this phenomenon which I wherewith pass on to you to try:
"Subject: Town & Country A/C panel lights flashing
Question: Hi Roland,

No question. Just passing on to you info for the person with the Town & Country with the two lights flashing on the HVAC head unit. This is a fairly common phenomenon on the 96-00 minivans.

To make it stop, you can just make the body control module run the diagnostic sequence. You start the engine, setting temp to cold, with fan on high, and pushing the rear wash and rear wiper buttons at the same time and holding them until a bunch of lights start to flash.

It takes a minute or two for the tests to cycle through. It'll run the calibration/diagnostic test (2 lights flashing) then the cooldown test (2 other lights flashing). If all passes, the rear wiper switch will flash alone. Push it to exit tests.

If it fails, one of the lights on the head unit will flash out a diagnostic code, just like the OBD does with the SES light. There's about six pages in the Chrysler manual about what the HVAC diagnostic codes are, but I have no clue what they are. I don't own a manual, but it was shown to me once.

Your advice was correct in that the questioner's HVAC system is probably fine. However, this phenomenon of the lights flashing can happen when the BCM experiences a spike or dip in power. You might want to ask the questioner if he recently removed or replaced the battery, or something in the charging system. If not, he may want to have his battery and/or alternator tested. He could have a dying battery, corroded terminals, bad ground, failing battery cables, etc., etc.

The BCMs in these vehicles, I have found, are very similar to the computer in your home or office, in that they like clean, steady power, and begin behaving badly if there are surges and power losses. Also, a soft reset of the BCM, by pulling the IOD fuse or negative battery cable for five minutes will clear out anomalies, glitches and other little hiccups, much the way a reboot will free your home or office computer from being caught in a data loop.

Rick"

The number of lights flashing is not 4 but two, but I suspect this is the same situation. Please let me know if this resolves the problem or not.
Roland

Posted on Oct 04, 2008

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I will pass the original instructions from the manual : "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.
FAIL CODES:
After calibration, Rear Wiper LED flashing
once, Intermittent LED flashing once. The
mode actuator did not reach defrost position.
(1) Using a voltmeter, check the mode door actuator
wiring connector. Check Pin 1 for battery voltage.
Move the HVAC control from the defrost to panel
position, and check Pin 6 voltage it should change
from 0.5 - 1 volts to 3.5 - 4.5 volts. If voltage is OK,
go to Step 2. If not OK, check for loose or corroded
connector, open or shorted circuit and repair as necessary.
(2) Remove actuator, and check if the gear pins are
in the correct track on cam or if they are binding. If
OK, go to Step 3. If not OK, repair as necessary.
(3) Check for binding door, if door is binding repair
as necessary. If gears and door are OK, replace
actuator.
(4) Once repairs are completed repeat the Calibration
Diagnostic and Cooldown test. Repeating the
test is necessary to clear the fault codes.
After calibration, Rear Wiper LED flashing
once, Intermittent LED flashing twice. The
mode actuator did not reach panel position.
(1) Using a voltmeter, check the mode door actuator
wiring connector. Check Pin 1 for battery voltage.
Move the HVAC control from panel to defrost position,
and check Pin 6 voltage it should change from
3.5 - 4.5 volts to 0.5 - 1 volts. If voltage is OK, go to
Step 2. If not OK, check for loose or corroded connector,
open or shorted circuit and repair as necessary.
(2) Remove actuator, and check if the gear pins are
in the correct cam track or binding. If OK, go to Step
3. If not OK, repair as necessary.
(3) Check for binding door, if door is binding repair
as necessary. If gears and door are OK, replace
actuator.
(4) Once repairs are completed repeat the Calibration
Diagnostic and Cooldown test. Repeating the
test is necessary to clear the fault codes.
After calibration, Rear Wiper LED flashing
once, Intermittent LED flashing three times.
The main temperature actuator/passenger
temperature actuator on a zone system did
not reach cold stop.
(1) Check if the correct HVAC control module was
used.
(2) Using a voltmeter, check the temperature door
actuator wiring connector. Check Pin 1 for battery
voltage. Move the HVAC control from the cold to hot
position, and check Pin 5 voltage it should change
from 0.5 - 4 volts to 3.5 - 4.5 volts. If voltage is OK,
go to Step 3. If not OK, check for loose or corroded
connector, open or shorted circuit and repair as necessary.
(3) Remove actuator, and check if gear pins are in
the correct cam track or binding. If OK, go to Step 4.
If not OK, repair as necessary.
(4) Check for binding door, if door is binding repair
as necessary. If gears and door are OK, replace
actuator.
(5) Once repairs are completed repeat the Calibration
Diagnostic and Cooldown test. Repeating the
test is necessary to clear the fault codes.
After calibration, Rear Wiper LED flashing
once, Intermittent LED flashing four times.
The main temperature actuator/passenger
temperature actuator on a zone system did
not reach hot stop.
(1) Check if the correct HVAC control module was
used.
(2) Using a voltmeter, check the temperature door
actuator wiring connector. Check Pin 1 for battery
voltage. Move the HVAC control from hot to cold
position and check Pin 5 voltage it should change
from 3.5 -4.5 volts 0.5 - 1.5 volts. If voltage is OK, go
to Step 3. If not OK, check for loose or corroded connector,
open or shorted circuit and repair as necessary.
(3) Remove actuator, and check if the gear pins are
in the correct track on cam or if they are binding. If
OK, go to Step 4. If not OK, repair as necessary.
(4) Check for binding door, if door is binding repair
as necessary. If gears and door are OK, replace
actuator.
(5) Once repairs are completed repeat the Calibration
Diagnostic and Cooldown test. Repeating the
test is necessary to clear the fault codes.

Posted on Jan 23, 2010

  • bruno santos Jan 23, 2010

    CONTINUED:
    After calibration, Rear Wiper LED flashing

    once, Intermittent LED flashing five times.

    The evaporator probe is open.

    (1) Using a voltmeter, check Pin 1 of the evaporator

    probe wiring connector for 0.1 - 4.75 volts. If OK,

    go to Step 2. If not OK, if greater than 4.75 volts

    check for loose or corroded connector, open circuit

    and repair as necessary.

    (2) Using a ohmmeter, check Pin 2 for a good

    ground, If OK, go to Step 3. If not OK, check for loose

    or corroded connector, open or shorted circuit and

    repair as necessary.

    (3) If ground and power circuit are OK, replace

    Evaporator Probe.

    (4) Once repairs are completed, press the intermittent

    button about 5 seconds until all LED’s light to

    remove fault code from memory. Then repeat the Calibration

    Diagnostic and Cooldown test. Repeating the

    test is necessary to clear the fault codes

    After calibration, Rear Wiper LED flashing

    once, Intermittent LED flashing six times. The

    evaporator probe is shorted.

    (1) Using a voltmeter, check Pin 1 of the evaporator

    probe wiring connector for 0.1 - 4.75 volts. If OK,

    go to Step 2. If less than 0.1 volts, check for loose or

    corroded connector, open or shorted circuit and repair

    as necessary.

    (2) Using a ohmmeter, check Pin 2 for a good

    ground, If OK, go to Step 3. If not OK, check for

    shorted circuit and repair as necessary.

    (3) If ground and power circuit are OK, replace

    Evaporator Probe

    (4) Once repairs are completed, press the intermittent

    button about 5 seconds until all LED’s light to

    remove fault code from memory. Then repeat the Calibration

    Diagnostic and Cooldown test. Repeating the

    test is necessary to clear the fault codes.

    After calibration, Rear Wiper LED flashing

    once, Intermittent LED flashing seven times.

    The Driver’s temperature actuator on a zone

    system did not reach cold stop.

    (1) Check if the correct HVAC control module was

    used.

    (2) Using a voltmeter, check at the temperature

    door actuator wiring connector, check Pin 1 for battery

    voltage. Move the HVAC control from cold to the

    hot position, check Pin 4 voltage it should change

    from 0.5 - 1.5 volts 3.5 - 4.5 volts. If voltage is OK, go

    to Step 3. If not OK, check for loose or corroded connector,

    open or shorted circuit and repair as necessary.

    (3) Remove actuator, and check if the gear pins are

    in the correct track on cam or if they are binding. If

    OK, go to Step 4. If not OK, repair as necessary.

    (4) Check for binding doors, if door are binding

    repair as necessary. If gears and door are OK, replace

    actuator.

    (5) Once repairs are completed repeat the Calibration

    Diagnostic and Cooldown test. Repeating the

    test is necessary to clear the fault codes.

    After calibration, Rear Wiper LED flashing

    once, Intermittent LED flashing eight times.

    The Driver’s temperature actuator on a zone

    system did not reach hot stop.

    (1) Check if the correct HVAC control module was

    used.

    (2) Using a voltmeter, check at the temperature

    door actuator wiring connector, check Pin 1 for battery

    voltage. Move the HVAC control from hot to cold

    position, Pin 4 voltage it should change from 3.5 - 4.5

    volts to 0.5 - 1.5 volts. If voltage is OK, go to Step 3.

    If not OK, check for loose or corroded connector, open

    or shorted circuit and repair as necessary.

    (3) Remove actuator, and check if the gear pins are

    in the correct track on cam or if they are binding. If

    OK, go to Step 4. If not OK, repair as necessary.

    (4) Check for binding door, if door is binding repair

    as necessary. If gears and door are OK, replace

    actuator.

    (5) Once repairs are completed repeat the Calibration

    Diagnostic and Cooldown test. Repeating the

    test is necessary to clear the fault codes.

    After calibration, Rear Wiper LED flashing

    once, Intermittent LED flashing nine times.

    The HVAC control module, has a internal

    failure.

    (1) Replace the HVAC control module.

    (2) Once repairs are completed repeat the Calibration

    Diagnostic and Cooldown test. Repeating the

    test is necessary to clear the fault codes."
    I took this from the manual hope it helps



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