This should help you.
SERVICE MANAGEMENT APPROVALS AND AUTHORIZATIONS
Service management approval in the form of a signature, date and explanation, is the method of documenting the involvement and consent of dealership service management prior to the work being performed.
Each Dealer must designate one person for each technician's shift within service management who is responsible and held accountable for all approvals and claim authorizations. Typically, this would be the service manager or director. Service technicians, claims administrators, other support or hourly personnel are not to be empowered for these types of management approvals.
The following conditions require service management approval before work is performed on the vehicle:
Your dealership's approval / authorization profile may vary dependent upon the level of empowerment provided. Questions regarding empowerment level should be direct to your Area Service Manager.
Reference: GM Policies & Procedures Article 1.6.2.o, WINS Claims Processing Manual Section II.C.2.F & G , IV.C.2.O & P, and Section V.
PIT4427: Repeat HVAC Actuator Replacements - keywords door cool heat mode temperature - (Jun 15, 2007)
This PI Being Updated To Add Additional Model Years. Please Discard PI02080.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
A replacement HVAC actuators is inoperative or that has worked one time and quit. The HVAC control head learns the stopping points based on how far the HVAC DOOR travels. If the actuator reachs the mechanical stops on the back of the actuator it will be outside of the range that the HVAC control head can learn. If the actuator was not mounted to the HVAC case prior to plugging in its connector, the actuator will go out of range and be inoperative.
Always attach the HVAC actuator to the case before installing the electrical connector.
If an actuator is out of range it may be possible to bring it back into range by following the procedure below:
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
05-01-38-001A: Info - Essential Tool for HVAC Mode Door Actuator Replacement - (Apr 8, 2005)
This bulletin is being revised to update the references to the service procedures in SI and add warranty and parts information. Please discard Corporate Bulletin Number 05-01-38-001 (Section 01 -- HVAC).
The purpose of this service bulletin is to announce the release of a new essential tool to service the Heating, Ventilation and Air Conditioning (HVAC) Mode Door Actuator. The new tool is an HVAC Puller, special tool number GE-47676, which was shipped in the Fall of 2004 to all Chevrolet and GMC dealers. It will no longer be necessary to replace the entire Mode Door Cam Assembly when only the Mode Door Actuator requires replacement. Previous to the release of this tool, it was necessary to remove the entire Instrument Panel Carrier to replace the Mode Door Cam Assembly. Now the Mode Door Actuator can be serviced from underneath the left side of the Instrument Panel Carrier using this new special tool.
The service procedures in SI have been updated to include the use of this new special tool. To replace the entire Mode Door Cam Assembly refer to the Mode Cam Replacement procedure in SI for more information (Document ID #1618104). To replace just the Mode Door Actuator, refer to the Mode Actuator Replacement procedure in SI for more information (Document ID #1609154). The labor time associated with labor operation D1808 has been changed to reflect the time savings when this new special tool is used. Labor operation D1829 has been added to the labor time guide to be used if the entire Mode Door Cam Assembly is replaced.
Use This Part Number
Do Not Use This Part Number
Actuator ASM, Mode Valve
Cam ASM, Mode Valve
Parts are currently available from GMSPO.