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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 467 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESENGINE FAILS TO REACH NORMAL OPERATING TEMPERATUREDIAGNOSTIC AIDS
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Diagnostic Aids

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Diagnostic Aids
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

The engine may fail to reach normal operating temperature due to an intermittent operation of one of the following components:

  • The thermostat
  • The electric fan system
  • The mechanical fan system

For electrical inspection of the electrical fan system, refer to Testing for Intermittent Conditions and Poor Connections .

Step Action Yes No
DEFINITION: Normal coolant temperature readings will be expected to vary from 88-104°C (190-220°F).
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Verify that the engine fails to reach normal operating temperature.
Is the engine failing to reach normal operating temperature?		 Go to Step 3  Go to Diagnostic Aids
3 Inspect the surge tank for low coolant.
Is there a loss of coolant?		 Go to Loss of Coolant (LC3)  or Loss of Coolant (LH2, LY7, LLT)  Go to Step 4 
4 Inspect the thermostat for proper operation. Refer to Thermostat Diagnosis .
Does the thermostat operate properly?		 Go to Step 6  Go to Step 5 
5 Replace the thermostat. Refer to Engine Coolant Thermostat Replacement (LY7)  or Engine Coolant Thermostat Replacement (V6)  or Engine Coolant Thermostat Replacement (LC3)  or Engine Coolant Thermostat Replacement (LH2) .
Did you complete the repair?		 Go to Step 6  -
6 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 2 
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.