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About your vehicle.
There has been a service bulletin for that type of concern. Here is what it states.
Bulletin No.: 07-01-39-008A
Date: April 17, 2009
with Manual Control HVAC System (RPO C67) or Manual Control HVAC System (RPO CJ3)
Some customers may comment that the temperature selected on the HVAC control head is not being maintained inside the vehicle.
This condition may be caused by the temperature doors losing their positions.
A new calibration has been released that periodically relearns the temperature door positions and prevents the doors from becoming lost. Technicians are to reprogram the HVAC control module with the updated software calibration using SPS. This new service calibration is available on TIS2WEB.
It is recommended that the HVAC actuators be recalibrated after the HVAC control module software is updated. Refer to Actuator Recalibration in the HVAC Control Module Programing and Setup section of SI for more information. When completed, the command state for the actuators will change from "None" to "On".
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That is if it were under warranty. It seems that most times they will want to get the full hour and call it "diagnose and flash", but if your a good customer they may give you a break.
Attachments are only available to registered users.
# 08266: Customer Satisfaction - Reduced Heating and Cooling-Reprogram Module - (Aug 12, 2008)
With Dual Zone Manual Climate Control (RPO CJ3)
THIS PROGRAM IS IN EFFECT UNTIL AUGUST 31, 2009.
Certain 2008 model year Chevrolet Impala vehicles equipped with dual zone manual climate control (RPO CJ3) may have software that does not allow the heating and air conditioning system to deliver maximum cold or maximum hot output. If this occurs, the vehicle may not warm or cool as intended.
Dealers are to reprogram the HVAC control head module.
Involved are certain 2008 model year Chevrolet Impala vehicles equipped with dual zone manual climate control (RPO CJ3) and built within the VIN breakpoints shown above.
For dealers with involved vehicles, a listing with involved vehicles containing the complete vehicle identification number, customer name, and address information has been prepared and will be provided through the applicable system listed below. Dealers will not have a report available if they have no involved vehicles currently assigned.
The listing may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this program is a violation of law in several states/provinces/countries.
Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this program.
No parts are required for the program.
Do not attempt to order the calibration number from GMSPO. The calibration numbers required for this service procedure are programmed into control modules via a Multiple Diagnostic Interface (MDI) or Tech 2(R) scan tool and TIS2WEB with the calibration update. Use TIS2WEB on or after 07/30/08 to obtain the calibration. If you cannot access the calibration, call the Techline Customer Support Center and it will be provided.
Service Programming System (SPS)
For step-by-step programming instructions, please refer to SI and the Techline Information System (TIS) terminal.
Review the information below to ensure proper programming protocol.
Ensure the following conditions are met before programming a control module:
Vehicle System Voltage
The ignition switch must be in the proper position. SPS prompts you to turn ON the ignition, with the engine OFF. DO NOT change the position of the ignition switch during the programming procedure, unless instructed to do so
Make certain all tool connections are secure, including the following components and circuits:
DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur.
DO NOT turn OFF the ignition if the programming procedure is interrupted or unsuccessful. Ensure that all control module and DLC connections are secure and the TIS terminal operating software is up to date. Attempt to reprogram the control module. If the control module cannot be programmed, replace the control module.
The General Motors Courtesy Transportation program is intended to minimize customer inconvenience when a vehicle requires a repair that is covered by the New Vehicle Limited Warranties. The availability of courtesy transportation to customers whose vehicles are within the warranty coverage period and involved in a product program is very important in maintaining customer satisfaction. Dealers are to ensure that these customers understand that shuttle service or some other form of courtesy transportation is available and will be provided at no charge. Dealers should refer to the General Motors Service Policies and Procedures Manual for Courtesy Transportation guidelines.
Submit a Product Claim with the information shown above.
Refer to the General Motors WINS Claims Processing Manual for details on Product Recall Claim Submission.
General Motors will notify customers of this program on their vehicle (see copy of customer letter shown in this bulletin).
Dealer Program Responsibility
All unsold new vehicles in dealers' possession and subject to this program must be held and inspected/repaired per the service procedure of this program bulletin before customers take possession of these vehicles.
Dealers are to service all vehicles subject to this program at no charge to customers, regardless of mileage, age of vehicle, or ownership, through August 31, 2009.
Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Program follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter.
In summary, whenever a vehicle subject to this program enters your vehicle inventory, or is inventory, or is in your dealership for service through August 31, 2009, you must take the steps necessary to be sure the program correction has been made before selling or releasing the vehicle.