GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 STS 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 5L40-E/5L50-E 🢒 Transmission Fluid Cooler Thermal Bypass Valve Replacement

Removal Procedure

    Object Number: 1334984 Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Place a suitable drain pan under the transmission.
  3. Remove the bolt and disconnect the transmission oil cooler lines from the bypass valve.

    4. Object Number: 1373637 Size: SH
  4. Remove the bolt from the oil cooler line retainer on the engine block. Position the oil cooler lines aside.

    5. Object Number: 1373627 Size: SH
  5. Remove the oxygen sensor wire bracket from the bypass valve stud and position the harness aside, if equipped.
  6. Remove the bypass valve retaining bolt/stud.
  7. Remove the bypass valve from the transmission.

Installation Procedure

    Object Number: 1373631 Size: SH
  1. Install NEW seals (1) onto the transmission bypass valve.

    2. Object Number: 1373627 Size: SH
  2. Install the bypass valve to the transmission.

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

  3. Install the bypass valve bolt or stud, depending on the application.

    4. Tighten
    Tighten the bolt or stud to 25 N·m (18 lb ft).

  4. Install the oxygen sensor wire harness bracket to the stud, if equipped.

    5. Object Number: 1373637 Size: SH
  5. Install the oil cooler line bracket to the engine block.

    6. Tighten
    Tighten the bolt to 25 N·m (18 lb ft).


    Object Number: 1334984 Size: SH
  6. Install the transmission oil cooler lines to the bypass valve. Install the bolt.

    7. Tighten
    Tighten the bolt to 25 N·m (18 lb ft).

  7. Remove the drain pan and lower the vehicle.
  8. Fill the transmission to the proper level and check for leaks. Refer to Transmission Fluid Check .