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.

2005 Cadillac CTS VFACTORY OEM SERVICE PROCEDURE

Removal Procedure

Fig 1: View of ECT Sensor Electrical Connector

Courtesy of GENERAL MOTORS CORP.

Turn OFF the ignition.

CAUTION: Refer to Vehicle Lifting Caution in Cautions and Notices.

Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Drain the engine coolant below the level of the engine coolant temperature (ECT) sensor. Refer to Draining and Filling Cooling System (LP1, LY7) or Draining and Filling Cooling System (LS6) in Engine Cooling.
Lower the vehicle.
Disconnect the harness connector from the ECT sensor.

Fig 2: Locating ECT Sensor

Courtesy of GENERAL MOTORS CORP.

Factory Service Tools

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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.