Vision V6-201 3.3L (1993)
Expansion Valve: Technical Service Bulletins
A/C - Erratic Operation/Poor Peformance
NO.: 24-16-92
GROUP: Air Conditioning
DATE: Dec. 14, 1992
SUBJECT:
A/C Refrigerant System Contamination
MODELS:
1993 (LH) Concorde/Intrepid/Vision
SYMPTOM/CONDITION:
Some vehicle A/C systems may work well for a few days, then suddenly stop producing cool air. If the A/C compressor runs continuously and the
condition exists in the fresh-air and recirculation mode, the thermostatic expansion valve (TXV) may be blocked by contamination from loose filter drier
desiccant. This condition affects vehicles built before August 20, 1992, (MDH 08-20-XX).
DIAGNOSIS:
1.
Recalibrate HVAC unit via the A/C control panel per service manual procedure.
2.
Re-evaluate A/C system for proper vehicle air cooling.
-
If system is functioning properly, discontinue diagnosis.
-
Otherwise, continue with next step.
3.
Run A/C system in full cold, fresh air mode (panel setting recommended) with gages set up to read compressor suction and discharge pressure, and
a DRB II (Scan Tool) set up to read the evaporator temperature.
-
If the suction pressure gage reads 10 psi or less and the discharge pressure is between 100 and 150 psi, then the expansion valve is probably
blocked with contaminant.
-
This is confirmed if the evaporator temperature is remaining near the ambient temperature.
-
If both conditions are met, perform the repair procedure.
4.
If the system pressures and evaporator temperature do not match the conditions of the previous step, test the A/C system for other problems that
could lead to the malfunction, i.e., low refrigerant charge level, condenser fan malfunctions, etc.
PARTS REQUIRED:
1
Filter Drier Bottle and Bracket Assembly
4592056
1
Liquid Line Assembly
4596031
1
Expansion Valve Assembly
4596077
REPAIR PROCEDURE:
1.
Replace the thermostatic expansion valve, A/C liquid line, and filter drier bottle as outlined in the 1993 Concorde/Intrepid/Vision Service Manual,
Publication No. 81-270-3140.
2.
Verify A/C operation.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No. 24-35-30-90
1.4 Hrs.
FAILURE CODE: 41 - Foreign Material
