GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Chevy C Cab/Chassis HD (GMT 400) 🢒 Engine 🢒 Engine Cooling 🢒 Engine Coolant Temperature Sensor Replacement

Removal Procedure

    Object Number: 742643 Size: SH
  1. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
  2. If equipped with the 8.1 L engine, remove the sensor connector from the bracket.
  3. If equipped with the 8.1 L engine, remove the ECT sensor.

    4. Object Number: 26943 Size: SH
  4. If equipped with the 6.5 L engine, remove the ECT sensor.

Installation Procedure

    Object Number: 26943 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. If equipped with the 6.5 L engine, install the ECT sensor.

    2. Tighten
    Tighten the ECT sensor to 25 N·m (18 lb ft).


    Object Number: 742643 Size: SH
  2. If equipped with the 8.1 L engine, install the ECT sensor.

    3. Tighten
    Tighten the ECT sensor to 20 N·m (15 lb ft).

  3. If equipped with the 8.1 L engine, install the sensor connector to the bracket.
  4. Connect the ECT sensor electrical connector.
  5. Add coolant if necessary.