A/C Temperature Differential (Stratification) Between Left and Right Front Panel Outlets
This bulletin involves diagnosing A/C temperature difference (stratification)
between the left and right front panel outlets.
2001 - 2002 (RS) Town & Country/Caravan/Voyager
2001 - 2002 (RG) Chrysler Voyager (International Markets)
NOTE: THIS BULLETIN APPLIES TO RS/RG VEHICLES EQUIPPED
WITH DUAL ZONE MANUAL (HAD), 3 ZONE MANUAL (HAG), OR ATC
(HAH) CLIMATE CONTROL SYSTEMS
More than 12 F. warmer outlet air temperature on the left front panel outlet as compared
to the right front panel outlet when the HVAC controls are set to max cold.
Set the A/C controls so that the compressor is engaged, the air within the vehicle is being
recirculated, the output air is being directed through the panel outlets, the temperature
control is in the full cool position, and the front and rear (if equipped with rear A/C) blower
motor(s) are operating at their highest speed. Use a temperature probe to measure the
front left and right panel outlet temperatures. If the difference between the two panel
outlets is greater than 12 F, perform the diagnostic procedure below.
CH6000 Scan Tool DRBIII
CH7000/7001 J1962 Cable
1. Connect DRBIIIŽ and check for A/C related Diagnostic Test Codes (DTC). If DTCs
are present, repair them using appropriate body diagnostic manual (Heating
& A/C section for manual systems and Automatic Temperature Control section
for ATC systems) and clear any fault codes related to A/C.
2. Use DRBIIIŽ to perform a Heater - A/C Control Calibration as outlined in the
appropriate Service Manual (section 24, Controls - Front).
a. If calibration passes, recheck the A/C panel outlet temperature stratifiaction.
b. If the calibration fails: Use the DRBIIIŽ for further diagnosis of the DTC’s in the
appropriate body diagnostic manual (Heating & A/C Diagnostic section) and correct
the problem. After calibration is successful, check the A/C panel outlet stratification.
3. Use the DRBIIIŽ to perform an A/C Cool Down Test as outlined in the appropriate
service manual (section 24, Diagnosis and testing).
a. If the cool down test fails, proceed to A/C Performance Test and verify
performance against the temperature and pressure chart in the service
manual (Section 24, Diagnosis and Testing). Add refrigerant if necessary
and check the A/C panel outlet stratification.
4. Perform diagnosis and testing of expansion valve as described in the appropriate
service manual (section 24, Plumbing - Front, Expansion Valve).
a. If the expansion valve fails the test - replace the expansion valve as described
in the service manual and proceed to step 5 of this procedure.
b. If the expansion valve passes, review the warranty history for previous
compressor failures. If a compressor has previously failed and the expansion
valve and/or receiver/drier was not replaced at that time, replace both
the expansion valve and receiver/drier.
5. Compare A/C system pressures to the A/C performance chart in the appropriate
service manual and recheck for panel outlet stratification.
6. If greater than 12 F. stratification exist, replace the evaporator and receiver/drier
following procedures in the appropriate service manual