GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Controls - 6.5L (L65) 🢒 Engine Coolant Temperature Sensor Replacement

Removal Procedure
  1. Drain the cooling system below the level of the sensor.

    2. Object Number: 26963 Size: SH
  2. Remove the harness connector from the ECT sensor by releasing the locking tab.

    3. Object Number: 26943 Size: SH
  3. Remove the ECT sensor.

Installation Procedure

    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.


    Object Number: 26943 Size: SH
  1. Install the ECT sensor into the engine.

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


    Object Number: 26963 Size: SH
  2. Install the harness connector.
  3. Refill the coolant system.