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Follow the instructions supplied with the J 39400-A . See Special Tools. AIR CONDITIONING (A/C) SYSTEM PERFORMANCE TEST (DIESEL ENGINE) 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. 1: This step determines if the A/C system has at least the minimum refrigerant charge 2: This step measures the performance of the A/C system. 3: This step is to allow for vehicle variations as well as high ambient air temperatures. any possible leaks. Test all areas of the system for leaks. Step Action Values Yes No IMPORTANT: The ambient air temperature must be at least 16°C ( 60°F). Do not induce additional air flow across the front of the vehicle during the test. If you were sent here from a DTC diagnostic table, clear the DTC upon completion of this test. 1. Park the vehicle inside or in the shade. 2. Open the windows in order to ventilate the interior of the vehicle. 3. If the A/C system was operating, allow the A/C system to equalize for 4. Turn OFF the ignition. 5. Install the J 43600 ACR 2000 Above Above
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1 Refrigerant Station. See Special 6. Record the ambient air temperature displayed on the J 43600 . See 7. Record the low and high side STATIC pressure readings. Are both the low and high side pressures 483 Above Go to Step 2 Go to Leak 2 1. Close the vehicle doors and windows. 2. Open the drivers door window 127- 152 mm (5-6 inches). 3. Select the following HVAC control settings: The A/C ON The coldest temperature The maximum blower speed The IP panel outlet mode All IP panel outlets are OPEN Recirculation mode 4. Install the temperature probes to the J 43600 in the left and right center 5. Apply the parking brake. 6. Place the transaxle/transmission in one of the following positions: PARK for Automatic NEUTRAL for Manual IMPORTANT: Record the relative humidity and the -
2008 Chevrolet Silverado 1500 2008 HVAC Heating, Ventilation, and Air Conditioning - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
7. Start the engine. 8. Operate the A/C system for 5 minutes. 9. Inspect A/C components for the following conditions: Abnormal frost areas Unusual noises 10. Print the following information: The panel outlet air 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 IMPORTANT: Press the RESET button, before using 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
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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 Diesel Engine Does all the data recorded fall within the 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 6 Are the low and high side pressures both - Go to Air 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
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