Here is a TSB,I don't know if it would help.
No A/C Or Evaporator Freeze Up On Long Trips With Blower In Low Speed Position
This bulletin involves adding a resistor 470 ohm resistor in the evaporator temperature
sensor signal circuit.
2004 - 2009 (HB) Durango
2007 - 2009 (HG) Aspen
NOTE: This bulletin applies to all HB/HG vehicles with A/C (sales code HAA or HAB
or HAF). This bulletin does not cover the 2009 HG HEV vehicle.
The customers may experience poor A/C, little to no A/C operation or reduced airflow from
the instrument panel vents. This condition often occurs after a extended drive cycle
(greater that 2 hours) with the A/C on and the blower speed is set to the low position. Once
the vehicle is shut off or the A/C is turned off for approximately 2 hours the A/C will operate
Adding the resistor to the evaporator temperature sensor signal wire allows the A/C
Compressor to cycle at a higher temperature more frequently to avoid this condition.
Using a Scan Tool (wiTECH™ or StarSCAN®) with the appropriate Diagnostic Procedures
available in TechCONNECT, verify all A/C systems are functioning as designed. If DTC's
are present record them on the repair order and repair as necessary before proceeding
further with this bulletin.
If the above condition is present, perform the Repair Procedure.
GROUP: Heating & Air
DATE: April 7, 2010
Qty. Part No. Description
1 68081530AA Kit, Resistor
Kit includes; 1 470 ohm resistor, 2 wire shrink wraps and
2 splice crimps.
1. Remove and disconnect the ATC or MTC control head. Follow the detailed service
procedures available in DealerCONNECT/TechCONNECT, Refer To Group 24 -
Heating & Air Conditioning > Controls, Front> Controls, A/C & Heater Removal
2. Using the wiring diagrams available in DealerCONNECT/TechCONNECT locate the
evaporator temperature sensor signal wire. Cavity 10 of the C2 black 12 - way
connector for ATC systems. Cavity 2 of 20 - way black C1 connector for MTC systems.
3. Measure 76mm (3 inches) down from end of ATC/MTC connector and cut the
evaporator temperature sensor signal wire.
4. Using the 2 splice crimps and 2 wire shrink wraps from resistor kit p/n 68064996AA,
splice in the 470 ohm resistor. Follow the detailed wiring procedures available in
DealerCONNECT/TechCONNECT, Refer To the Wiring Tab > 8W-01 - Wiring
Diagram Information > Wire > Standard Procedure.
NOTE: Be sure to use the splice crimps and shrink wrap on wires and resistor.
5. Install the ATC or MTC control head. Follow the detailed service procedures available
in DealerCONNECT/TechCONNECT, Refer To Group 24 - Heating & Air Conditioning
> Controls, Front> Controls, A/C & Heater Installation Procedures.
6. Using the wiTECH™ or StarSCAN® erase all DTC.