For 1990-2009 cars

# Service Manual Update Regarding a Change in the Defrost Operation for the Automatic Climate Control

Subject: | Service Manual Update Regarding a Change in the Defrost Operation for the Automatic Climate Control

Models: | 2002-2003 Saturn L-Series Vehicles with Automatic Climate Control (RPO C68)

Attention: | Technician

### Purpose

The purpose of this bulletin is to provide information on the defrost operation change with the latest automatic HVAC calibration installed. When installing the 7.2 version of the automatic HVAC calibration into a vehicle that previously had the 6.0 or 7.0 version of the calibration installed, the operation of the front defrost button will change. The following table describes the operation of the front defrost button with each calibration version.

Calibration Version | Release Date | Defrost Operation Description
--- | --- | ---
6.0 - 7.0 | July 2001 - February 2003 | Press defrost button on the control head to turn front defrost on and press button again to turn front defrost off and return to the previous mode.
7.2 | February 2003 | Press defrost button on the control head to turn front defrost on and press mode button to turn front defrost off and change modes.

All new service automatic HVAC control units since March 2003 (P/Ns 22694049 and 22696058) have the 7.2 version of the automatic HVAC calibration pre-installed from service.

Please update your 2002-2003 Saturn L-Series HVAC Service Manual with the information in this bulletin.

The eSI website will be updated immediately and future Service Stall System SI CD releases will include this and other Service Manual updates.