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Fig. 3: A/C System Pressure Zone Classification - Gas Engine With Engine Driven A/C Performance Table - Gas Engine With Engine Driven Cooling Fan Ambient Air Temperature Relative Humidity Service Port Pressure Maximum Left Center Discharge Air Temperature Low Side High Side 13-16°C (55- 65°F) 0-100% 150-246 kPa (25-36 psi) 730-1190 kPa (106- 173 psi) 12°C (54°F) 19-24°C (66- 75°F) Below 40% 150-280 kPa (22-41 psi) 900-1390 kPa (131- 202 psi) 14°C (57°F) Greater than 40% 179-137 kPa (26-46 psi) 990-1500 kPa (144- 218 psi) 16°C (61°F)
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
AIR CONDITIONING (A/C) DIAGNOSTICS - PRESSURE ZONE A 25-29°C (76- 85°F) Below 35% 218-328 kPa (32-48 psi) 1240-1640 kPa (180- 238 psi) 17°C (63°F) 35-60% 236-342 kPa (34-50 psi) 1290-1680 kPa (187- 244 psi) 18°C (64°F) Above 60% 250-365 kPa (36-53 psi) 1340-1760 kPa (194- 255 psi) 20°C (68°F) 30-35°C (86- 95°F) Below 30% 266-386 kPa (39-56 psi) 1500-1940 kPa (218- 282 psi) 21°C (70°F) 30-50% 280-397 kPa (41-58 psi) 1540-1990 kPa (224- 289 psi) 22°C (72°F) Above 50% 330-430 kPa (44-62 psi) 1600-2070 kPa (232- 300 psi) 24°C (75°F) 36-41°C (96- 105°F) Below 20% 328-439 kPa (48-64 psi) 1810-2240 kPa (263- 325 psi) 25°C (77°F) 20-40% 337-457 kPa (49-66 psi) 1840-2290 kPa (267- 332 psi) 26°C (79°F) Above 40% 355-474 kPa (52-69 psi) 1890-2340 kPa (274- 340 psi) 27°C (81°F) 42-46°C (106- 115°F) Below 20% 391-491 kPa (57-71 psi) 2130-2500 kPa (309- 363 psi) 29°C (84°F) Above 20% 397-508 kPa (58-74 psi) 2160-2550 kPa (313- 370 psi) 30°C (86°F) 47-49°C (116- 120°F) Below 30% 451-552 kPa (65-80 psi) 2420-2790 kPa (351- 405 psi) 33°C (92°F) Step Action Value Yes No DEFINITION: The high and low side pressures may be normal or slightly less than normal. Air Delivery Concern Slight Refrigerant Under Charge Refrigerant Contamination Were you sent here from the A/C System Go to Air
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1 - Go to Step 2 Engine) or 2 Refer to the panel air outlet temperatures - Go to Step 7 Go to Step 3 3 Did the customer mention that the A/C - Go to Step 4 Go to Step 5 4 Increase engine speed to 2000 RPM. - Go to Air Go to Step 5 1. Refer to the pressures recorded during the A/C system performance 2. Inspect for the following conditions: CAUTION:
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
5 The high side pressure is The discharge line is hot. The suction line is cool. Do the listed conditions exist? Refer to Moving Parts and Hot - Go to Step 7 Go to Step 6 6 1. Refer to the pressures recorded during the A/C system performance 2. Inspect for the following conditions: The low side pressure is -
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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