GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Engine 🢒 Engine Controls and Fuel - 7.8L (LF8) 🢒 Engine Coolant Temperature Sensor Replacement

Removal Procedure
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .

    2. Object Number: 736635 Size: SH
  2. Disconnect the electrical connector to the engine coolant temperature (ECT) sensor (1).
  3. Loosen the ECT sensor retaining bolt.
  4. Remove the ECT sensor.

Installation Procedure

    Object Number: 736635 Size: SH
  1. Install the ECT sensor.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Install the ECT sensor (1) retaining bolt.

    3. Tighten
    Tighten the retaining bolt to 20 N·m (15 lb ft).

  3. Connect the electrical connector to the engine coolant temperature sensor.
  4. Connect the negative battery able. Refer to Battery Negative Cable Disconnection and Connection .