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.

2001 GMC C3500 HD 6.5 F, AutomaticFACTORY OEM SERVICE PROCEDURE

Removal Procedure

CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.

Remove the negative battery cables.
Drain the cooling system below the level of the sensor.

Fig 1: ECT Electrical Connector

Courtesy of GENERAL MOTORS CORP.

Remove the electrical connector by releasing the locking tab.

Fig 2: Removing ECT Sensor

Courtesy of GENERAL MOTORS CORP.

Remove the sensor.

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.