Auto Temp Control Un-Requested Change To Manual (24-06-98)

Publication date: 1998-05-22
Reference number: 24-06-98

AUTO TEMP CONTROL UN-REQUESTED CHANGE TO MANUAL

TECHNICAL SERVICE BULLETIN

Reference Number(s): 24-06-98, Date of Issue: May 22, 1998

AUTOMATIC TEMPERATURE CONTROL, UN-REQUESTED CHANGE TO MANUAL

Model(s): 1998-99 Chrysler (LH) Concorde, LHS, 300M

1998-99 Dodge (LH) Intrepid

Group: Air Conditioning

Bulletin No.: 24-06-98

Date: May 22, 1998

NOTE: This bulletin applies vehicles built before July 20, 1998 (MDH 0720XX). The last six digits of the V.I.N. will be in the one hundred thousand series (1XXXXX).

DISCUSSION

The Automatic Temperature Control (ATC) system, if left in "AUTO" mode when the ignition is turned off, occasionally reverts to "MANUAL" mode when the ignition is turned back on. The following conditions will cause this to happen:

Removal of the ATC head while servicing the A/C or radio, without disconnecting the battery, will set an erroneous Diagnostic Trouble Code (DTC), "IN CAR TEMPERATURE SENSOR FAILURE" in the Body Control Module (BCM). The presence of this DTC will result in the un-requested "AUTO" to "MANUAL" change.
Changing the blower speed while the ignition is turned off will result in the unrequested "AUTO" to "MANUAL" change.

NOTE: Condition #1 can be prevented by DISCONNECTING THE BATTERY DURING ELECTRICAL SYSTEM SERVICE, and corrected by erasing the DTC.

NOTE: Condition #2 is normal operation of the ATC and should be explained to the owner as such.

WARRANTY INFORMATION

POLICY:

Information only.