Grand Caravan V6-3.3L VIN R (2005)
Heater Core: Testing and Inspection
Successful completion of the rear heater performance check will confirm that the rear heater core is properly filled with engine coolant. If the check is
not successful, either there is still air trapped in the rear heater core or the rear heater plumbing is restricted. This check should be performed with the
vehicle in a shop where the ambient temperature is about 21° C (70° F).
1. Start the engine and allow it to idle until it warms up to normal operating temperature.
2. Adjust the A/C-heater controls so that the front heater is turned Off and the rear heater is set for full Heat with the rear blower motor at its highest
speed setting.
3. Use an accurate test thermometer to measure the temperature of the air being discharged from the rear heater outlet located at the base of the right
C-pillar.
4. Proper discharge air temperature readings should be from 57° to 63° C (135° to 145° F).
