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Go to Step 2 Cooling 2 Repair any present DTCs. Refer to Diagnostic Go to Step 3 - 3 Inspect the coolant level. Go to Step 5 Go to Step 4 4 Fill the cooling system to the proper level. Refer Go to Step 5 - 5 Engine overheating can cause a loss of coolant. Go to Step 19 Go to Step 6 6 1. Idle the engine at normal operating temperature. 2. Inspect for heavy white smoke coming out of the exhaust pipe. Is a heavy white smoke present from the exhaust Go to Step 7 Go to Step 8 7 1. Coolant in the exhaust system creates a distinctive, burning coolant odor in the 2. Condensation in the exhaust system can cause an odorless white smoke during Does the white smoke have a burning coolant Go to Step 20 Go to Step 8 8 Visually inspect the hoses, pipes and hose Go to Step 21 Go to Step 9 Visually inspect the following components: Block heater Coolant pressure cap Core plugs
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
9 Throttle body Engine block Intake manifold Radiator Thermostat housing Water pump Go to Step 21 Go to Step 10 10 1. Pressure test the cooling system. Refer to Cooling System Leak Testing. 2. With the cooling system pressurized, visually inspect the components listed in Are any leaks present? Go to Step 21 Go to Step 11 11 Pressure test the coolant pressure cap. Refer to Go to Step 12 Go to Step 16 12 Inspect for the following conditions: A coolant smell inside of the vehicle Coolant in the HVAC module drain tube Coolant on the vehicle floor covering near Go to Step 21 Go to Step 13 13 Inspect the underside of the engine oil fill cap Go to Step 14 Go to Step 15 14 Inspect the engine oil fluid level indicator for a Go to Step 17 Go to Step 15 Inspect the automatic transmission oil fluid level
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
THERMOSTAT DIAGNOSIS Tools Required J 24731 Tempil Stick 15 substance. Go to Step 18 Go to Step 22 16 Replace the coolant pressure cap. Go to Step 22 - 17 1. Replace the radiator. Refer to Radiator Replacement (4.3, 4.8, 5.3, and 6.0L) or 2. Replace the oil and filter. Refer to Engine Oil and Oil Filter Replacement Is the repair complete? Go to Step 22 - 18 1. Replace the radiator. Refer to Radiator Replacement (4.3, 4.8, 5.3, and 6.0L) or 2. Service the automatic transmission. Refer to the following: Engine Coolant/Water Is the repair complete? Go to Step 22 - 19 Repair the engine overheating condition. Refer Go to Step 22 - 20 Repair the engine internal coolant leak. Refer to Go to Step 22 - 21 Repair or replace the leaking component. Refer Go to Step 22 - 22 Operate the system in order to verify the repair. System OK Go to Step 2
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Use one of the following procedures in testing for a malfunctioning thermostat. Thermostat Test Procedure Using Tempil Sticks The coolant thermostat can be tested using a temperature (tempil) stick. The temperature stick is a 1. Use a tempil stick in order to find the opening and the closing temperatures of the coolant thermostat. J 24731 -188 tempil stick melts at 87°C (188°F). The thermostat should begin to open. J 24731 -206 tempil stick melts at 97°C (206°F). The thermostat should be fully open. 2. Replace the coolant thermostat if it does not operate properly between this temperature range. Thermostat Test Procedure Using Glycol Inspect the operation of the thermostat by hanging the thermostat on a hook in a 50/50 percent In order to inspect if the thermostat valve is opening properly, perform the following test:
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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