A/C - Poor Heating and Cooling Performance
No: LA-412-001Issue: 1
Date: 14 Mar 2006
SECTION: 412-01
Heating and Ventilation System Performance
AFFECTED VEHICLE RANGE:
Land Rover LR3 (LA)
VIN: 5A000360 to 6A380334
CONDITION SUMMARY:
POOR HEATING AND VENTILATION PERFORMANCE
A customer may report a concern that the heating and ventilation system performance is poor, with possibly one or more of the following symptoms:
^ The upper torso area is significantly cooler than the lower body and feet area.
^ The cabin area near the doors is cooler than in the center area of the cabin.
^ The cabin is colder than the set temperature.
Cause:
The control module software may not be providing adequate air distribution under all conditions.
Action:
Should a customer express concern regarding the above, refer to the Repair Procedure detailed in this bulletin to update the control module software.
TOOLS:
LRCD13...................WDS CD Disc 13 or later
WARRANTY:
NOTE:
Repair procedures are under constant review, and therefore times are subject to change; those quoted here must be taken as guidance only. Always refer to DDW to obtain the latest repair time.
DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.
Normal warranty policy and procedures apply.
REPAIR PROCEDURE
CONFIGURE HVAC CONTROL MODULE
CAUTION:
Connect a suitable battery charger to the vehicle during WDS diagnosis and module configuration.
1. Connect the T4/WDS diagnostic equipment to the vehicle and begin a session.
2. Determine the current software levels of the HVAC control module as follows:
^ Enter vehicle details.
^ Select the "Vehicle Configuration" tab.
^ Select "Module Information".
^ Select "Network Integrity Test".
^ Note the software part numbers displayed on the WDS screen.
3. Configure the HVAC control module software as follows:
^ Return to "Vehicle Configuration" screen.
^ Select "Module Configuration".
^ If the software part number displayed on the screen is not the same as noted in Step 2 proceed to configure the HVAC control module as follows:
^ Select "Configure Existing Modules".
^ Select "Heating Ventilation and Air Conditioning Control Module" from the sub-menu.
^ Check tick-box to continue and follow on-screen instructions.
4. Repeat Step 2 to confirm the software level change.
5. Exit the WDS session and disconnect the diagnostic equipment from the vehicle.
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