L200 L4-2.2L VIN F (2002)
Control Module HVAC: All Technical Service Bulletins
A/C - Automatic Temperature Control Overcompensation
Bulletin No.: 04-01-39-001
Date: February 25, 2004
TECHNICAL
Subject:
Automatic Climate Control Over compensation (Verify Automatic Climate Control Functions and Review Customer Information)
Models:
2002-2004 Saturn L-Series Vehicles with Automatic Climate Control (RPO C68)
Attention:
Fixed Operations Manager and Technician
Condition:
Some customers may comment on one or more of the following conditions:
1.
Automatic climate control system may not maintain desired temperature setting or may over compensate (overshoot) desired temperature.
2.
Blower may move high volume of air shortly after vehicle start-up when automatic climate control system is in the "Auto" mode.
3.
Temperature of air from vents may be hotter or colder than selected temperature.
Cause:
The conditions listed above may be caused by the software calibration in the automatic climate control module.
Customers may also be unfamiliar with operating characteristics of the automatic climate control system.
Correction:
1.
Verify that there is air flow through the inside temperature sensor in the control module.
1.1.
Turn the ignition ON, with the engine OFF.
1.2.
Set the MODE to panel vent mode.
1.3.
Turn blower motor (fan speed) to maximum speed position.
1.4.
Place a small piece of paper (25 mmx 25 mm [1 in x 1 in]) in front of the aspirator tube opening.
-
If paper stays in place, the aspirator tube and inside air temperature sensor has proper air flow.
-
If paper does not stay in place, the aspirator tube may be leaking or blocked. Inspect the aspirator tube for an air leak, poor connection,
or obstruction, and repair if necessary. Refer to "Aspirator Hose - Automatic Climate Control Removal and Installation" procedure in
the 2002-2003 Saturn L-Series HVAC Service Manual, Vol. 1. or "Aspirator Replacement" procedure in the HVAC section of the 2004
Saturn L-Series Service Manual, Vol. 1.
2.
Inspect passenger compartment air filter. If filter is dirty or obstructed, replace filter. Refer to "Passenger Compartment Air Filter Removal and
Installation" procedure in the 2002-2003 Saturn L-Series HVAC Service Manual, Vol. 1. The procedures for passenger compartment air filter
replacement in SI and the printed Service Manuals also apply to 2004 model year vehicles.
3.
Verify that automatic climate control module calibration version is 7.2 or greater (P/N 22718824 or greater). Refer to "Checking Calibration Part
Number" in the Service Procedure section of this bulletin for instructions for checking calibration version.
^
If calibration is not P/N 22718824 or greater, install latest available calibration. Refer to "Installing New Calibration" in the Service Procedure
section of this bulletin.
^
If calibration is current, P/N 22718824 or greater, review and emphasize automatic climate control system operating characteristics with
customer. Many customer concerns relate to normal operating characteristics of the automatic climate control system. Refer to the Customer
Information section of this bulletin.
