A/C System Performance
WARNING: This page is about a different car, the 1999 Dodge Pickup, 1999 Dodge Durango, 1999 Dodge Dakota, and 1999 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- Park vehicle out of direct sunlight. Ensure ambient temperature is at least 70°F (21°C). Connect tachometer and manifold gauge set to vehicle. Turn A/C on. Turn mode control to panel and recirculated air positions, temperature control lever to maximum cooling, and blower to high.
- Start engine and allow it to run at 1000 RPM, with A/C compressor clutch engaged. Engine should be at operating temperature with doors, windows, and hood closed. Insert thermometer into left center air outlet.
- Run engine and operate system for 5 minutes. The A/C compressor clutch may cycle, depending on temperature. If A/C compressor clutch cycles, stop engine and disconnect negative battery cable. Remove clutch cycling pressure switch connector. Place a jumper wire across terminals of clutch cycling pressure switch harness connector.
- Connect negative battery cable. Turn A/C on. Start and operate engine at idle speed. With A/C compressor clutch engaged, note air outlet temperature, compressor discharge pressure, and evaporator inlet pressure. See appropriate A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS and A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS tables.
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS (DAKOTA)
| Ambient Temp. °F (°C) | Outlet Vent Temp. °F (°C) |
|---|---|
| 70 (21) | 38 (3) |
| 80 (27) | 44 (7) |
| 90 (32) | 48 (9) |
| 100 (38) | 55 (13) |
| 110 (43) | 64 (18) |
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS (DURANGO)
| Ambient Temp. °F (°C) | Outlet Vent Temp. °F (°C) |
|---|---|
| 70 (21) | 48 (9) |
| 80 (27) | 48 (9) |
| 90 (32) | 54 (12) |
| 100 (38) | 59 (15) |
| 110 (43) | 65 (18) |
A/C SYSTEM PERFORMANCE TEMPERATURE SPECIFICATIONS (RAM PICKUP)
| Ambient Temp. °F (°C) | Outlet Vent Temp. °F (°C) |
|---|---|
| 70 (21) | 40-45 (5-7) |
| 80 (27) | 55-60 (13-16) |
| 90 (32) | 60-70 (16-21) |
| 100 (38) | 70-75 (21-24) |
| 110 (43) | 80-85 (27-29) |
| 120 (49) | 85-90 (29-32) |
A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS (DAKOTA)
| Ambient Temp. °F (°C) | High Side psi (kg/cm2 ) | Low Side psi (kg/cm2 ) |
|---|---|---|
| 70 (21) | 160-200 (11.2-14.1) | 25-35 (1.8-2.5) |
| 80 (27) | 190-220 (13.4-15.5) | 32-40 (2.2-2.8) |
| 90 (32) | 200-240 (14.1-16.9) | 37-45 (2.6-3.2) |
| 100 (38) | 220-260 (15.5-18.3) | 39-50 (2.7-3.5) |
| 110 (43) | 250-300 (17.6-21.1) | 45-55 (3.2-3.9) |
A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS (DURANGO)
| Ambient Temp. °F (°C) | High Side psi (kg/cm2 ) | Low Side psi (kg/cm2 ) |
|---|---|---|
| 70 (21) | 100-150 (7.0-10.5) | 20-30 (1.4-2.1) |
| 80 (27) | 135-185 (9.5-13.0) | 20-30 (1.4-2.1) |
| 90 (32) | 170-220 (12.0-15.5) | 25-35 (1.8-2.5) |
| 100 (38) | 210-255 (14.8-17.9) | 31-41 (2.2-2.9) |
| 110 (43) | 245-295 (17.2-20.7) | 37-47 (2.6-3.3) |
A/C SYSTEM PERFORMANCE PRESSURE SPECIFICATIONS (RAM PICKUP)
| Ambient Temp. °F (°C) | High Side psi (kg/cm2 ) | Low Side psi (kg/cm2 ) |
|---|---|---|
| 70 (21) | 135-145 (9.5-10.2) | 35-40 (2.5-2.8) |
| 80 (27) | 175-215 (12.3-15.1) | 40-50 (2.8-3.5) |
| 90 (32) | 215-270 (15.1-19.0) | 50-60 (3.5-4.2) |
| 100 (38) | 270-330 (19.0-23.2) | 60-70 (4.2-4.9) |
| 110 (43) | 340-370 (23.9-26.0) | 70-80 (4.9-5.6) |
| 120 (49) | 400-430 (28.1-30.2) | 85-90 (6.0-6.3) |