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HOMESERVICE MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 51 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 2.4L - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSENGINE COOLANT TEMPERATURE SENSOR REPLACEMENTREMOVAL PROCEDURE
2008 Chevrolet HHR LT, 2.4 P, Automatic

Removal Procedure

2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Removal Procedure
WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
    Fig 1: Identifying Engine Harness Electrical Connectors - Top Of Engine
    GM1647986Courtesy of GENERAL MOTORS CORP.
  1. Drain the cooling system. Refer to Cooling System Draining and Filling (GE 47716 Fill) or Cooling System Draining and Filling (Static Fill LE5, L61) .
  2. If equipped with regular production option (RPO) MN5, disconnect the engine harness electrical connector (3) from the engine coolant temperature (ECT) sensor.
    3. Fig 2: Identifying Engine Harness Electrical Connectors
    GM1648166Courtesy of GENERAL MOTORS CORP.
  3. If equipped with RPO M86, disconnect the engine harness electrical connector (3) from the ECT sensor.
    4. Fig 3: View Of ECT Sensor
    GM773501Courtesy of GENERAL MOTORS CORP.
  4. Carefully remove the ECT sensor.
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.