Caravan FWD V6-3.8L VIN L (1999)
Air Door Actuator / Motor: Testing and Inspection
Actuator Calibration/Diagnostics and Cool Down Test
GENERAL INFORMATION
If the HVAC control module is replaced, the Calibration Diagnostic and Cooldown tests will need to be performed. Once this group of tests have
successfully passed, they can be performed individually. The engine must be running during the test to provide hot coolant for the heater, A/C
compressor operation and to assure that the actuators are calibrated correctly. The HVAC control module is capable of troubleshooting the system in
approximately 120 seconds. If a condition is detected, an error code is displayed. The error code cannot be erased until the condition is repaired and
the diagnostic test is performed.
CAUTION: Do not remove the actuators from the Heater-A/C unit assembly with power applied. Removal should only be done with the Ignition
OFF. The actuators have no mechanical stops to limit the travel. If the actuator rotates and is not connected to the unit assembly, it will become out of
calibration.
Actuator Calibration
Radio Bezel And HVAC Control
Radio Bezel And HVAC Control, Rear Blower Motor Switch And Zone Control
Mode, Blend and Zone (if equipped) door calibration compensates for mechanical variations in the actuators, HVAC control module and its linkages.
In vehicle calibration can be entered from the control's front panel. If the REAR WIPE and INTERMITTENT LED's flash simultaneously when
Ignition is cycled ON, the actuators have not been calibrated or during the previous calibration a failure occurred. Diagnostics will always occur
during Calibration Diagnostic and Cooldown test.
Diagnostics
During the Actuator calibration, diagnostics are performed on the actuators and evaporator temperature Fin Sensor. Once diagnostics are completed
the REAR WIPER and INTERMITTENT LED's will flash to indicate either a successful calibration or the appropriate fail code(s). At this time
manual testing of the Blend, Mode and Driver (if equipped) potentiometers can be performed. If a failure is detected during Diagnostics a fault will be
set in the control. When Ignition is cycled OFF and then ON or Diagnostics is aborted, the REAR WIPER and INTERMITTENT LED's will flash
simultaneously showing that a failure has occurred. The control will not indicate the fail code, but only that a failure had occurred during the last
diagnostics test. The only way to clear the failure codes is repeat the Calibration Diagnostic and Cooldown test, after all repairs are completed.
