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The low-side pressure The high-side pressure 11. Compare the low and high side pressures and the panel output Does all the data recorded fall within the Go to Step 8 Go to Step 3 3 If the pressures and temperatures 1. Continue to operate the A/C system for an additional 5 minutes. 2. RESET the J 43600 and record the pressures and temperatures again. 3. Compare the low and high side pressures and the panel output - Go to Step 8 Go to Step 4 4 Do the high and low side pressures fall - Go to Air Go to Step 5 5 Is the low side pressure greater than the - Go to Air Go to Step 6 Are the low and high side pressures both Go to Air
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
A/C System Pressure Zone Classification - Gas Engine With Electric Cooling Fan or RPO HP2 6 - (A/C) Go to Step 7 7 Is the high side pressure greater than the - Go to Air Go to Step 8 8 Operate the system in order to verify the - System OK Go to
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 2: A/C System Pressure Zone Classification - Gas Engine With Engine Driven A/C Performance Table - Gas Engine With Electric Cooling Fan or RPO HP2 Ambient Air Temperature Relative Humidity Service Port Pressure Maximum Discharge Air Temperature Low Side High Side 13-18°C (55- 65°F) 0-100% 165-257 kPa (24-37 psi) 830-1180 kPa (120- 171 psi) 10°C (50°F) 19-24°C (66- 75°F) Below 40% 185-290 kPa (27-42 psi) 1010-1340 kPa (147- 194 psi) 11°C (52°F) Above 40% 202-313 kPa (29-45 psi) 990-1370 kPa (144- 199 psi) 13°C (55°F) Below 35% 225-319 kPa (33-46 1180-1470 kPa (171- 14°C (57°F)
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
AIR CONDITIONING (A/C) SYSTEM PERFORMANCE TEST (GAS ENGINE W/ENGINE DRIVE This test measures the operating efficiency of the A/C system under the following conditions: The current ambient air temperature The current relative humidity The high side pressure of the A/C system The low side pressure of the A/C system The temperature of the air being discharged into the passenger compartment Test Description The numbers below refer to the step numbers on the diagnostic table. 25-29°C (76- 85°F) psi) 213 psi) 35-50% 238-330 kPa (35-48 psi) 1180-1490 kPa (171- 216 psi) 14°C (57°F) Above 50% 248-352 kPa (36-51 psi) 1190-1520 kPa (173- 221 psi) 16°C (61°F) 30-35°C (86- 95°F) Below 30% 257-359 kPa (37-52 psi) 1320-1610 kPa (192- 234 psi) 17°C (63°F) 30-50% 267-375 kPa (39-54 psi) 1340-1650 kPa (194- 239 psi) 18°C (64°F) Above 50% 281-399 kPa (41-58 psi) 1360-1710 kPa (197- 248 psi) 20°C (68°F) 36-41°C (96- 105°F) Below 20% 290-393 kPa (42-57 psi) 1480-1760 kPa (215- 255 psi) 19°C (66°F) 20-40% 298-411 kPa (43-60 psi) 1500-1820 kPa (218- 264 psi) 21°C (70°F) Above 40% 313-429 kPa (45-62 psi) 1540-1880 kPa (224- 273 psi) 22°C (72°F) 42-46°C (106- 115°F) Below 20% 327-428 kPa (47-62 psi) 1650-1910 kPa (239- 277 psi) 21°C (70°F) Above 20% 336-448 kPa (49-65 psi) 1680-1980 kPa (244- 287 psi) 23°C (73°F) 47-49°C (116- 120°F) Below 30% 367-474 kPa (53-69 psi) 1830-2100 kPa (266- 305 psi) 25°C (77°F)
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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