Hello,

I have a 2002 Grand Caravan with the 3 zone climate control air conditioning.

The A/C itself works great except the zone located on the drivers side does not blow the same temperature as the other 2 zones. There is some cool air coming out but is significantly warmer than the other two zone.

I normally set all zones to 70 degrees but even if I put them all to their lowest setting "LO", the drivers side is noticably warmer than the other zones.

Any ideas what might be causing this and how I can fix it?

Thanks! Ed

 

Welcome to DF
First i ck the heater system for codes.could be low on freon, blend door or rec door. Thats why the heater system ck'ed for codes.

 

I just had the A/C serviced (new compressor) about two months ago and had the freon checked just last week and everything is OK.. It was doing that before the new compressor too. It's not very noticeable in the shade or when it's a cloudy day or outdoor temp is below 85 or so...but in S.Florida, especially now...daytime highs are in the low to mid 90's everyday and mid to upper 80's even at night.

I'll have the heater codes checked but I doubt (I'm just guessing of course) that would be it. The passenger side and the rear a/c are OK...good and cold. It's just the drivers side that's not as cold.

What is the blend door or rec door?

Thanks! Ed

 

There is a TSB for that condition, 24-007-02. Maybe MT can e-mail it to you.

 

Why email it, i'll just post it.
SUBJECT:
A/C Temperature Differential (Stratification) Between Left and Right Front Panel Outlets
OVERVIEW:
This bulletin involves diagnosing A/C temperature difference (stratification)
between the left and right front panel outlets.
MODELS:
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
SYMPTOM/CONDITION:
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.
DIAGNOSIS:
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.
EQUIPMENT REQUIRED:
CH6000 Scan Tool DRBIII
CH7000/7001 J1962 Cable
DIAGNOSTIC PROCEDURE:
1. Connect DRBIII® 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 DRBIII® 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.
24-007-02 -2-
b. If the calibration fails: Use the DRBIII® 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 DRBIII® 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

 

I sure hope someone can help on this. Compressor has been replaced, freon added, no leaks. My gauges are basically showing that the heater is on?? The control panel shows on AC not heat. The back of the van blows cool air (not cold), but front blows hot air. What am I missing here?? 3.3 Liter