| Subject: | Automatic Dual Zone HVAC Battery Draw |
| Models: | 2004-2007 Buick Rainier |
| 2003-2008 Cadillac Escalade Models |
| 2002-2008 Chevrolet TrailBlazer |
| 2003-2008 Chevrolet Avalanche, Silverado, Suburban, Tahoe |
| 2002-2008 GMC Envoy Models |
| 2003-2008 GMC Sierra, Yukon Models |
| 2002-2004 Oldsmobile Bravada |
This bulletin is being revised to add models and model years. Please discard Corporate Bulletin Number 02-01-39-007A (Section 01 - HVAC).
When diagnosing battery draws on trucks equipped with the automatic dual zone HVAC controls (RPO CJ2), technicians should keep in mind that the control head does not completely "go to sleep" until after 150-250 minutes, or
up to 4-¼ hours, from when the ignition key is turned OFF. This is a normal condition. In these cases, DO NOT replace the control head.
