A/C - Insufficient Cooling Performance

Category 16
Applicable Model/s 1986-1987 626
Subject

EVAPORATOR FREEZE-UP
Bulletin No.. 015/86
Issued 10/3/86
Revised 10/22/86

Evaporator:

DESCRIPTION

Some reports have been received regarding the A/C evaporator on 626 vehicles which "freezes-up" and causes insufficient cooling performance. In most cases, this condition is caused by a defective thermistor and/or a thermistor that is incorrectly installed in the evaporator. If a customer complains about insufficient cooling performance, follow the procedures below in order to diagnose and repair evaporator freeze-up vehicles.

REPAIR PROCEDURES

1. Diagnosis

If the following conditions occur on the vehicle, which may be caused by the evaporator freeze-up, proceed to Step 2.

^ Insufficient cooling from center louver.*
^ Compressor does not cycle properly. (Magnet clutch is engaged all the time.)
^ Air volume from vents is reduced noticeably.

The revised section is indicated by an asterisk. Please replace the original Service Bulletin with the revised bulletin.

Thermistor Probe and Evaporator:

2. Check if thermistor probe is properly installed in evaporator.

Thermistor:

NOTE:

If the tip of thermistor (red epoxy) is cracked or brittle, replace thermistor with thermistor explained in Step 3.

3. If the thermistor is properly installed and the conditions in Step 1 continue to occur, replace thermistor with one which contains a white mark or black line on the label as shown.
CAUTION:
When replacing the thermistor, be sure to install the new one to correct position per specifications as shown in Step 2.

NOTE:
White mark or black line indicates thermistor has passed critical testing at manufacturer. Also, thermistor part number (0000 67 0957 85) has NOT been changed.

WARRANTY INFORMATION
Other than MMA-C Area MMA-C Area Only
Customer Comment Code: 6J A1
Damage Code: 63 AB
Part No. of Main Cause: 0000 67 0957 85
Operation No: 155250 R X
Labor Hours: 1.0 hr.