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HOMESERVICE MANUALSDODGE AND RAM1999CARAVAN BASE, 2.4 BREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHEATER SYSTEMTROUBLE SHOOTINGTEMPERATURE & MODE CONTROL LEVER
1999 Dodge and Ram Caravan Base, 2.4 B

Temperature & Mode Control Lever

1999 Dodge and Ram Caravan Base, 2.4 BSECTION Temperature & Mode Control Lever
  1. Perform calibration/diagnostics procedure. See IN-VEHICLE CALIBRATION  under ADJUSTMENTS. Press wash button to cycle code level to level 2 (mode potentiometer test). See READING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTICS.
  2. Rotate mode control lever from panel to defrost position. Observe intermittent rear wiper button LED. Intermittent rear wiper button LED flash rate should slow as lever moves from panel to defrost position, and speed up as lever moves from defrost to panel position.
  3. Press WASH button to cycle code level to level 3 (blend/pass. potentiometer test). Slide temperature control lever from hot to cold position. Observe intermittent rear wiper button LED. Intermittent rear wiper button LED flash rate should slow as lever moves from hot to cold position, and speed up as lever moves from cold to hot position.
RENDER: 1.0x

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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.