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HOMESERVICE MANUALSCHRYSLER2004CROSSFIRE STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - ELECTRICAL DIAGNOSTICSDIAGNOSIS AND TESTINGDTC P0128: FORCED LIMITED POWER EXCESSIVE HIGH COOLANT TEMPDIAGNOSTIC TEST2. THERMOSTAT OPERATION
2004 Chrysler Crossfire Standard

2. Thermostat Operation

2004 Chrysler Crossfire StandardSECTION 2. Thermostat Operation
NOTE: This test works best if performed on a cold engine (cold soak).

Turn the ignition on.

With the DRB III(R), read the ECT Deg value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature.

NOTE: If engine coolant temperature is above 82°C (180°F), allow the engine to cool until 65°C (150°F) is reached.

Start the Engine.

During engine warm-up, monitor the ECT Deg value. The temp deg value change should be a smooth transition from start up to normal operating temp 82°C (180°F). Also monitor the actual coolant temperature with a thermometer.

NOTE: As the engine warms up to operating temperature, the actual coolant temperature (thermometer reading) and the ECT Deg in the DRB III(R) sensor should stay relatively close to each other.

Using the appropriate service information, determine the proper opening temperature of the thermostat.

Fig 1: Checking Thermostat Operation
G01861688Courtesy of DAIMLERCHRYSLER CORP.

Did the thermostat open at the proper temperature? 

  1. Yes  >> Go To 3
  2. No  >> Replace the thermostat. See COOLING SYSTEM (MECHANICAL) article.

    See POWERTRAIN VERIFICATION TEST - VER 2  .

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.