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 SYSTEMTESTINGHEATER PERFORMANCE
1999 Dodge and Ram Caravan Base, 2.4 B
Heater Performance
1999 Dodge and Ram Caravan Base, 2.4 BSECTION Heater Performance
- With transmission in Park or Neutral, start engine. Allow engine to reach normal operating temperature. With engine at idle, set controls to maximum heat, floor and high blower positions. Using a thermometer, check air temperature coming from floor vents. See HEATER OUTPUT TEMPERATURE table.
- If floor outlet air temperature is lower than specified, check cooling system and electric cooling fan. See ELECTRIC COOLING FANS - ALL OTHER MODELS article.
- Check that both return and supply heater hoses are hot. If coolant return hose is much cooler than supply hose, repair coolant obstruction in heater system. Check for air flow obstruction in heater system. Check blend air door for proper operation.
HEATER OUTPUT TEMPERATURE
| Ambient Temp. °F (°C) | Outlet Vent Temp. °F (°C) |
|---|---|
| 60 (15.6) | 144 (62.2) |
| 70 (21.1) | 147 (63.8) |
| 80 (26.6) | 150 (65.5) |
| 90 (32.2) | 153 (67.2) |
RENDER: 1.0x
NO RELATED
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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.