GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 Catera 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Air Conditioning Evaporator Thermal Expansion Valve Replacement

Removal Procedure
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .

    2. Object Number: 153145 Size: SH
  2. Remove the evaporator tube extension bolt.

    3. Object Number: 153147 Size: SH
  3. Remove the LF floor air outlet duct.

    4. Object Number: 153150 Size: SH
  4. Remove the vacuum solenoid/cutoff valve actuator screws.
  5. Disconnect the actuator connectors.
  6. Position the actuators out of the way.

    7. Object Number: 153151 Size: SH
  7. Remove the evaporator access panel screws.
  8. Remove the evaporator access panel.

    9. Object Number: 153164 Size: SH
  9. Remove the evaporator tube screw.
  10. Remove the evaporator tube.

    11. Object Number: 153180 Size: SH
  11. Remove the Thermal Expansion Valve (TXV) screws.
  12. Remove the TXV.

Installation Procedure

    Object Number: 153169 Size: SH
  1. Install the TXV.
    2. • Use new O-rings.
    • Lubricate the new O-rings with mineral oil, 525 viscosity.

    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.

  2. Install the TXV screws.

    3. Tighten
    Tighten the TXV screws to 8 N·m (71 lb in).


    Object Number: 153164 Size: SH
  3. Install the evaporator tube:
    4. • Use new O-rings.
    • Lubricate the new O-rings with mineral oil, 525 viscosity.
  4. Install the evaporator tube screw.

    5. Tighten
    Tighten the screw to 5 N·m (44 lb in).


    Object Number: 153151 Size: SH
  5. Install the evaporator access panel.
  6. Install the evaporator access panel screws.

    7. Tighten
    Tighten the screws until fully seated and not stripped.


    Object Number: 153150 Size: SH
  7. Position the vacuum solenoid/cutoff valve actuators.
  8. Install the vacuum solenoid/cutoff valve actuator screws.

    9. Tighten
    Tighten the screws until fully seated and not stripped.

  9. Connect the actuator connectors.

    10. Object Number: 153147 Size: SH
  10. Install the LF floor air outlet.

    11. Object Number: 153145 Size: SH
  11. Install the evaporator tube extension bolt.

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

  12. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  13. Leak test the A/C system.