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 CALIBRATIONCALIBRATION/DIAGNOSTICS
1999 Dodge and Ram Caravan Base, 2.4 B
In-Vehicle Calibration: Calibration/Diagnostics
1999 Dodge and Ram Caravan Base, 2.4 BSECTION Calibration/Diagnostics
- To enter calibration/diagnostics test, set parking brake. Start and warm engine to normal operating temperature. With engine idling, turn blower switch to high. Turn mode switch to panel. Open all outlets. Move temperature lever to full cold.
- Press and hold rear wash and rear wiper buttons simultaneously for 5 seconds (until all LEDs illuminate). All LEDs should illuminate for 5 seconds. Rear wiper and intermittent rear wiper button LEDs will flash alternately during calibration/diagnostics test.
- After approximately 60 seconds, if only rear wiper button LED is flashing, calibration is successful and system is okay. If rear wiper and intermittent rear wiper button LEDs are flashing, Diagnostic Trouble Codes (DTC) are present, see READING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTICS.
- To exit calibration/diagnostics test at any time, press rear window defogger button, rear wiper button, or cycle ignition off and then on. Test will automatically end 15 minutes after calibration/diagnostics is entered.
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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.