GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2003 🢒 DeVille 🢒 Engine 🢒 Engine Cooling 🢒 Coolant Heater Cord Replacement

Removal Procedure
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    2. Object Number: 727216 Size: SH
  2. Disconnect the coolant heater cord (1) from the right coolant heater (3).
  3. Lower the vehicle.
  4. Cut the coolant heater cord strap (2) from the engine wiring harness.

    5. Object Number: 727213 Size: SH
  5. Disconnect the coolant heater cord (1) from the left coolant heater (3).
  6. Cut the coolant heater cord straps (2) from the engine wiring harness.
  7. Remove the coolant heater cord (1) from the loom at the fuel rail support bracket.
  8. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical-4.6L.

    9. Object Number: 727211 Size: SH
  9. Remove the coolant heater cord clips (3) from the fuel injector sight shield studs.
  10. Remove the coolant heater cord (2) from the vehicle.

Installation Procedure

    Object Number: 727211 Size: SH
  1. Install the coolant heater cord (2) to the vehicle.
  2. Place the coolant heater cord clips (3) over the fuel injector sight shield studs.
  3. Tie a new coolant heater cord strap (1) to the engine wiring harness at the front of the engine.

    4. Object Number: 727213 Size: SH
  4. Connect the coolant heater cord (1) to the left coolant heater (3).
  5. Tie new coolant heater cord straps (2) to the engine wiring harness at the rear of the engine.
  6. Secure the excess coolant heater cord (1) to the loom at the fuel rail support bracket.
  7. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    8. Object Number: 727216 Size: SH
  8. Connect the coolant heater cord (1) to the right coolant heater (3).
  9. Lower the vehicle.
  10. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical-4.6L.