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Fig. 4: Pressure Testing Radiator Cap 3. Use the J 24460-01 (1) with J 42401 (2) in order to test the pressure cap. 4. Test the pressure cap for the following conditions: Pressure release when the J 24460-01 exceeds the pressure rating of the pressure cap. Maintain the rated pressure for at least 10 seconds. Note the rate of pressure loss. 5. Replace the pressure cap under the following conditions: The pressure cap does not release pressure which exceeds the rated pressure of the cap. The pressure cap does not hold the rated pressure. COOLING SYSTEM LEAK TESTING Tools Required J 24460-01 Cooling System Pressure Tester J 42401 Radiator Cap/ Surge Tank Test Adapter Testing IMPORTANT: Lubricate J-42401 and pressure cap o-rings with coolant and press cap to seat o-ring on J-42401 before turning to engage CAUTION: Under pressure, the temperature of the solution in the radiator can be considerably higher, without boiling. CAUTION: In order to help avoid being burned, do not remove the
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1. Remove the pressure cap. 2. Test the operation of the pressure cap. Refer to Pressure Cap Testing. 3. Wash the pressure cap mating surface with water. Fig. 5: Applying Pressure To Cooling System Using J 42401 radiator cap while the engine and the radiator are hot.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
4. Use the J 24460-01 with theJ 42401 in order to apply pressure to the cooling system. Do not exceed the pressure cap rating. 5. The cooling system should hold the rated pressure for at least 2 minutes. Observe the gage for any pressure loss. 6. Repair any leaks as required. FAN CLUTCH DIAGNOSIS Step Action Yes No 1 Were you sent here from Symptoms or another Go to Step 2 Go to Symptoms - Engine Cooling 2 Is there excessive fan air noise? Go to Step 3 Go to Step 4 3 Fan air noise is normal during cold engine start Go to Step 13 Go to Step 4 4 Rotate the fan clutch.Does the fan clutch rotate? IMPORTANT: The engine must be turned OFF and the engine Go to Step 5 Go to Step 14 5 Visually inspect the fan blades for cracks, Go to Step 6 Go to Step 15 6 Visually inspect the fan clutch for signs of Slight silicone leakage may not effect the Excess leakage will prevent the fan clutch Go to Step 14 Go to Step 7
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
7 Inspect the fan clutch for proper installation. 1. Move the fan blade back and forth in a lateral motion. 2. Inspect for fan blade to fan clutch movement. Go to Step 10 Go to Step 8 8 Inspect the fan clutch for wear. 1. Move the fan blade back and forth in a lateral motion. 2. Inspect for fan clutch lateral movement. IMPORTANT: Approximately 6.5 mm (1/4 in) movement at Go to Step 14 Go to Step 9 9 The fan clutch should have more turning Go to Step 11 Go to Step 14 10 Tighten the fan. Refer to Fastener Tightening Go to Step 16 - Perform a fan clutch engagement test. 1. Ensure the engine coolant level is full. 2. Ensure the cooling fan drive belt tension is correct and not slipping. 3. Position and secure a thermometer between the fan clutch and the radiator. 4. Ensure the cooling fan is disengaged before starting this test.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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