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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2062 (HEATING, VENTILATION, AND AIR CONDITIONING)DIAGNOSTIC INFORMATION AND PROCEDURESAIR CONDITIONING (A/C) SYSTEM PERFORMANCE TEST (DIESEL ENGINE)A/C SYSTEM PRESSURE ZONE CLASSIFICATION DIESEL ENGINE
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
A/C System Pressure Zone Classification Diesel Engine
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION A/C System Pressure Zone Classification Diesel Engine
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
A/C Performance Table - Diesel Engine
| Ambient Air Temperature | Relative Humidity | Service Port Pressure | Maximum Discharge Air Temperature | |
|---|---|---|---|---|
| Low Side | High Side | |||
| 13-18°C (55-65°F) | 0-100% | 150-279 kPa (22-41 psi) | 420-1140 kPa (61-165 psi) | 9°C (48°F) |
| 19-24°C (66-75°F) | Below 40% | 150-298 kPa (22-43 psi) | 531-1240 kPa (77-180 psi) | 11°C (52°F) |
| Above 40% | 176-366 kPa (26-53 psi) | 760-1510 kPa (110-219 psi) | 14°C (57°F) | |
| 25-29°C (76-85°F) | Below 35% | 216-359 kPa (31-52 psi) | 990-1550 kPa (143-225 psi) | 15°C (59°F) |
| 35-50% | 250-382 kPa (36-55 psi) | 1130-1640 kPa (164-238 psi) | 16°C (61°F) | |
| Above 50% | 275-430 kPa (40-62 psi) | 1230-1820 kPa (178-264 psi) | 18°C (64°F) | |
| 30-35°C (86-95°F) | Below 30% | 287-434 kPa (42-63 psi) | 1350-1930 kPa (195-280 psi) | 19°C (66°F) |
| 30-50% | 311-463 kPa (45-67 psi) | 1440-2040 kPa (209-296 psi) | 21°C (70°F) | |
| Above 50% | 342-506 kPa (50-73 psi) | 1560-2190 kPa (226-318 psi) | 23°C (73°F) | |
| 36-41°C (96-105°F) | Below 20% | 366-506 kPa (53-73 psi) | 1750-2300 kPa (254-334 psi) | 23°C (73°F) |
| 20-40% | 382-531 kPa (55-77 psi) | 1800-2390 kPa (261-347 psi) | 25°C (77°F) | |
| Above 40% | 409-557 kPa (59-81 psi) | 1900-2480 kPa (276-360 psi) | 27°C (81°F) | |
| 42-46°C (106-115°F) | Below 20% | 452-575 kPa (66-84 psi) | 2180-2660 kPa (316-386 psi) | 27°C (81°F) |
| Above 20% | 465-599 kPa (68-87 psi) | 2220-2730 kPa (322-396 psi) | 29°C (84°F) | |
| 47-49°C (116-120°F) | Below 30% | 535-629 kPa (78-91 psi) | 2580-2900 kPa (375-421 psi) | 30°C (86°F) |
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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.