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 SYSTEMSHVAC SYSTEMSSYSTEM TESTSA/C SYSTEM PERFORMANCE
1999 Dodge and Ram Caravan Base, 2.4 B
A/C System Performance
1999 Dodge and Ram Caravan Base, 2.4 BSECTION A/C System Performance
- Ensure ambient temperature is at least 70°F (21°C). Connect manifold gauge set to A/C system. Connect tachometer to engine. Set controls to recirculation, panel, A/C, full cool and high speed settings. Start and warm engine to operating temperature. Close all doors and windows. Allow engine to idle at 1000 RPM with A/C clutch engaged.
- Operate system for 5 minutes to allow system to stabilize. Insert thermometer in left center panel outlet. Compressor clutch may cycle depending on ambient temperature. Record compressor discharge pressure, air temperature at left center panel outlet, and ambient temperature when compressor clutch is engaged.
- Compare measurements with A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS and A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS tables. If measurements are not within specification, correct refrigerant charge or replace components as necessary.
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS
| Ambient Temp. °F (°C) | Outlet Vent Temp. °F (°C) |
|---|---|
| 70 (21) | 45 (7) |
| 80 (27) | 49 (9) |
| 90 (32) | 54 (12) |
| 100 (38) | 56 (13) |
| 110 (43) | 59 (15) |
A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS
| Ambient Temp. °F (°C) | High Side psi (kg/cm2 ) | Low Side psi (kg/cm2 ) |
|---|---|---|
| 70 (21) | 112-210 (7.9-14.8) | 10-37 (0.7-2.6) |
| 80 (27) | 131-214 (9.2-15.0) | 17-38 (1.2-2.7) |
| 90 (32) | 180-215 (12.7-15.1) | 21-47 (1.5-3.3) |
| 100 (38) | 203-288 (14.3-20.2) | 28-51 (2.0-3.6) |
| 110 (43) | 232-331 (16.3-23.3) | 30-53 (2.1-3.7) |
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.