Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSDODGE AND RAM1999CARAVAN BASE, 2.4 BREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHEATER SYSTEMADJUSTMENTSIN-VEHICLE CALIBRATIONNOTES
1999 Dodge and Ram Caravan Base, 2.4 B
In-Vehicle Calibration: Notes
1999 Dodge and Ram Caravan Base, 2.4 BSECTION Notes
NOTE:
Whenever heater control panel, doors or door actuators are replaced, actuator calibration/diagnostics and cool-down test must be performed.
- Mode and blend door calibration compensates for mechanical differences in actuators, heater unit and its linkages. Calibration/diagnostics tests is entered using switches and buttons on heater control front panel. Diagnostics are automatically performed, whenever calibration/diagnostics test is activated.
- Turn ignition on. If LEDs on heater control panel are not flashing, system has passed calibration/diagnostics test. No calibration is required. If rear wiper and intermittent rear wiper button LEDs are flashing simultaneously, actuators have not been calibrated, a previous calibration failure occurred, or calibration/diagnostics have failed. Perform calibration/diagnostics test.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.