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HOMESERVICE MANUALSISUZU2006ASCENDER S, 5.3 M, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 475 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESENGINE FAILS TO REACH NORMAL OPERATING TEMPERATURE
2006 Isuzu Ascender S, 5.3 M, 4WD

Engine Fails To Reach Normal Operating Temperature

2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Engine Fails To Reach Normal Operating Temperature
WARNING: This page is about a different car, the 2008 Pontiac Torrent and 2008 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Step Action Yes No
1
  1. Ensure that the cooling system is full.
  2. Allow the engine/radiator cap to cool.
  3. Start the engine.
  4. Turn the air conditioning system off.
  5. Inspect the engine cooling fans.
Is either engine cooling fan on?		 Go to Step 2  Go to Step 3 
2
  1. Diagnose and repair the cooling fan system. Refer to Cooling Fan Always On .
  2. Verify the customer complaint.
Does the engine still fail to reach normal operating temperature?		 Go to Step 3  System OK
3 Install the Scan Tool to the DLC. Compare the Scan Tool coolant temperature reading to the I/P cluster coolant temperature.
Is the I/P cluster coolant temperature close to the Scan Tool coolant temperature?		 Go to Step 5  Go to Step 4 
4
  1. Diagnose and repair the coolant temperature gage system. Refer to Instrument Cluster Gages Inoperative .
  2. Verify the customer complaint.
Does the engine still fail to reach normal operating temperature?		 Go to Step 5  System OK
5
CAUTION: As long as there is pressure in the cooling system, the temperature can be considerably higher than the boiling temperature of the solution in the radiator without causing the solution to boil. Removal of the pressure cap while the engine is hot and pressure is high will cause the solution to boil instantaneously - possibly with explosive force - spewing the solution over the engine, fenders and the person removing the cap.
Inspect the thermostat for proper operation.Is the thermostat operating properly?		 Go to Step 1  Go to Step 6 
6
  1. Replace the thermostat. Refer to Engine Coolant Thermostat Replacement (RPO LNJ)  or Engine Coolant Thermostat Replacement (RPO LY7) .
  2. Verify the customer complaint.
Does the engine still fail to reach normal operating temperature?		 Go to Step 1  System OK
RENDER: 1.0x

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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.