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Fig. 3: View Of Thermostat Test Procedure Using Glycol 1. Completely submerge the thermostat in the glycol solution. The solution should be 11°C (22°F) above the temperature indicated on the thermostat valve. 2. Thoroughly agitate the solution. Under these conditions, the thermostat valve should open. In order to inspect if the thermostat valve is closing properly, perform the following test:
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1. Completely submerge the thermostat in a glycol solution. The solution should be 6°C (10°F) below the temperature indicated on the thermostat valve. 2. Thoroughly agitate the solution. Under these conditions, the thermostat valve should close completely. COOLANT HEATER INOPERATIVE (GASOLINE) Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. Circuit/System Description The optional coolant heater operates using 110 volt AC external power and is designed to warm Reference Information Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Circuit/System Testing 1. Test the engine coolant heater for an open or short to ground. If open or shorted, replace the heater. 2. If the heater tests normal, replace the coolant heater power cord. IMPORTANT: The power supply cord will read open due to an internal thermal switch if the ambient temperature is above -18°C (0 °F).
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Coolant Heater Replacement (LH6, LY2, LMG, LY5, and LY6) or Coolant Heater Coolant Heater Cord Replacement (L76 and L92) or Coolant Heater Cord ENGINE FAILS TO REACH NORMAL OPERATING TEMPERATURE PRESSURE CAP TESTING Step Action Yes No 1 Did you review the Symptoms - Engine Cooling Go to Step 2 Go to Symptoms 2 Verify that the engine does not reach normal System OK Go to Step 3 3 Inspect the coolant level. Go to Step 4 Go to Step 5 4 1. Add coolant as necessary. 2. Perform a cooling system pressure test. Does the cooling system hold pressure? System OK Go to Step 5 5 Inspect for a stuck open, missing, or incorrect System OK Go to Step 6 6 Install the correct replacement thermostat. Refer Go to Step 7 - 7 Run the engine in order to verify the repair. - System OK
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Tools required J 24460-01 Cooling System Pressure Tester J 42401 Radiator Cap / Surge Tank Test Adapter Pressure Cap Testing 1. Remove the pressure cap. 2. Wash the pressure cap sealing surface with water. CAUTION: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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