Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 277 (ENGINE CONTROLS AND FUEL - 2.2L - REPAIR INSTRUCTIONS)REPAIR INSTRUCTIONSENGINE COOLANT TEMPERATURE SENSOR REPLACEMENTINSTALLATION PROCEDURE

2008 Chevrolet HHR LT, 2.4 P, Automatic

Installation Procedure

2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Installation Procedure

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.

Fig 1: View Of ECT Sensor

Courtesy of GENERAL MOTORS CORP.

If you are reinstalling the original sensor, or if you are installing a NEW sensor without a sealer, coat the threads with sealant. Refer to Adhesives, Fluids, Lubricants, and Sealers .

CAUTION: Refer to Component Fastener Tightening Caution .

Install the ECT sensor and tighten to 20 N.m (15 lb ft).

Fig 2: Identifying Engine Harness Electrical Connectors

Courtesy of GENERAL MOTORS CORP.

If equipped with RPO M86, connect the engine harness electrical connector (3) to the ECT sensor.

Fig 3: Identifying Engine Harness Electrical Connectors - Top Of Engine

Courtesy of GENERAL MOTORS CORP.

If equipped with RPO MN5, connect the engine harness electrical connector (3) to the ECT sensor.
Fill the cooling system. Refer to Cooling System Draining and Filling (Static Fill LE5, L61) or Cooling System Draining and Filling (GE 47716 Fill) .

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.