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HVAC System - Automatic: Removal & Installation Cadillac STS I facelift

Automatic HVAC System 5 illustrations ~924 words

Removal Procedure

  1. Remove the ashtray. Refer to «Ashtray Replacement»(ref-338119-S07446242862009081700000) .
  2. Remove the radio. Refer to «Radio Replacement»(ref-338122-S12051301772009081700000) .
  3. Remove the HVAC control module retaining screws.
  4. Disconnect the HVAC control module electrical connectors.
  5. Remove the HVAC control module.

Installation Procedure

  1. Install the HVAC control module.
  2. Connect the HVAC control module electrical connectors.
  3. Install the HVAC control module retaining screws and tighten to 2 N.m (18 lb in).
  4. Install the radio. Refer to «Radio Replacement»(ref-338122-S12051301772009081700000) .
  5. Install the ashtray. Refer to «Ashtray Replacement»(ref-338119-S07446242862009081700000) .
  6. Refer to «Control Module References»(ref-338152-S12253781062009081700000) for programming and setup information.

Scheme 17

Scheme 17: Auxiliary Heater and Air Conditioning Control Replacement
Scheme 17: Auxiliary Heater and Air Conditioning Control Replacement
CalloutComponent Name
CAUTION: Refer to Fastener Caution . Fastener Tightening Specifications: Refer to Fastener Tightening Specifications .
1Panel, Center Console End Tip: Release the retaining clips using a blunt trim tool. Refer to Center Console End Panel Replacement .
2Connector, Auxiliary HVAC Control Module
3Retaining Screws (Qty: 4) Tighten: 2 N.m (18 lb in)
4Module, Auxiliary HVAC Control
CAUTION
Refer to Fastener Caution .

Scheme 18

Scheme 18: Blower Motor Control Processor Replacement
Scheme 18: Blower Motor Control Processor Replacement
CalloutComponent Name
Preliminary Procedure Remove right sound insulator. Refer to Instrument Panel Insulator Panel Replacement - Right Side . Remove the electrical connectors from the blower motor control processor.
1Blower Motor Control Processor Screws CAUTION: Refer to Fastener Caution . Tighten: 9 N.m (80 lb in)
2Blower Motor Control Processor
CAUTION
Refer to Fastener Caution .
  1. Remove the air inlet assembly. Refer to «Air Inlet Assembly Replacement»(ref-338121-S02052121522009081700000) .
  2. Disconnect the electrical connector from the recirculation actuator.
  3. Remove the recirculation actuator screws (1).
  4. Remove the recirculation actuator.
  1. Install the recirculation actuator.
  2. Install the recirculation actuator screws (1) and tighten to 1 N.m (9 lb in).
  3. Connect the electrical connector to the recirculation actuator.
  4. Install the air inlet assembly. Refer to «Air Inlet Assembly Replacement»(ref-338121-S02052121522009081700000) .
  1. Remove the instrument panel (I/P) carrier. Refer to «Instrument Panel Carrier Replacement»(ref-338119-S38666748422009081700000) .
  2. Disconnect the mode actuator electrical connector.
  3. Remove the mode actuator screws (3).
  4. Remove the mode actuator.
  1. Install the mode actuator.
  2. Install the mode actuator screws (2) and tighten to 1 N.m (9 lb in ).
  3. Connect the electrical connector to the actuator.
  4. Install the I/P carrier. Refer to «Instrument Panel Carrier Replacement»(ref-338119-S38666748422009081700000) .
  1. Remove the air inlet assembly. Refer to «Air Inlet Assembly Replacement»(ref-338121-S02052121522009081700000) .
  2. Remove the right air temperature actuator screws (1).
  3. Remove the right air temperature actuator.
  4. Disconnect the right air temperature actuator electrical connector.
  1. Connect the right air temperature actuator electrical connector.
  2. Install the right air temperature actuator.
  3. Install the right air temperature actuator screws (1) and tighten to 1 N.m (9 lb in).
  4. Install the air inlet assembly. Refer to «Air Inlet Assembly Replacement»(ref-338121-S02052121522009081700000) .
  1. Remove the left closeout panel. Refer to «Instrument Panel Insulator Panel Replacement - Left Side»(ref-338119-S20980418342009081700000) .
  2. Disconnect the left air temperature actuator electrical connector from the actuator.
  3. Remove the left air temperature actuator screws.
  4. Remove the left air temperature actuator.
  1. Install the left air temperature actuator.
  2. Install the left air temperature actuator screws and tighten to 1 N.m (9 lb in).
  3. Connect the left air temperature actuator electrical connector to the actuator.
  4. Install the left closeout panel. Refer to «Instrument Panel Insulator Panel Replacement - Left Side»(ref-338119-S20980418342009081700000) .

Scheme 19

Scheme 19: Auxiliary Temperature Valve Actuator Replacement
Scheme 19: Auxiliary Temperature Valve Actuator Replacement
CalloutComponent Name
Fastener Tightening Specifications: Refer to Fastener Tightening Specifications .
Preliminary Procedures Remove the instrument panel (I/P) retainer. Refer to Instrument Panel Retainer Replacement . Remove the I/P carrier. Refer to Instrument Panel Carrier Replacement .
1Connector, Air Temperature Actuator
2Retaining Screws, Air Temperature Actuator (Qty: 3) Tighten: 1 N.m (9 lb in)
3Actuator, Air Temperature

Scheme 20

Scheme 20: Mode Actuator Replacement - Console
Scheme 20: Mode Actuator Replacement - Console
CalloutComponent Name
1Front Floor Console Refer to Front Floor Console Replacement .
2Center Console End Panel Tip: Using blunt trim tool release the retaining clips. Refer to Center Console End Panel Replacement . Removing the end panel allows the removal of the air distribution duct.
3Side Impact Brace Screw (Qty: 5) CAUTION: Refer to Fastener Caution . Tighten: 2 N.m (18 lb in)
4Side Impact Brace
5Air Distribution Duct Screw (Qty: 3) Tighten: 2 N.m (18 lb in)
6Air Distribution Duct
7Retainer Actuator Screw (Qty: 2) Tighten: 1 N.m (9 lb in)
8Mode Actuator Connector
9Mode Actuator
CAUTION
Refer to Fastener Caution .
  1. Remove the I/P cluster trim panel. Refer to «Instrument Cluster Trim Panel Replacement»(ref-338119-S06648334112009081700000) .
  2. Remove the knee bolster reinforcement. Refer to «Driver Knee Bolster Reinforcement Replacement»(ref-338119-S15203470762009081700000) .
  3. Disconnect the aspirator hose from the HVAC module.
  4. Disconnect the aspirator hose from the inside air temperature sensor.
  5. Remove the aspirator hose.
  1. Install the aspirator hose.
  2. Connect the aspirator hose to the inside air temperature sensor.
  3. Connect the aspirator hose to the HVAC module.
  4. Install the knee bolster reinforcement. Refer to «Driver Knee Bolster Reinforcement Replacement»(ref-338119-S15203470762009081700000) .
  5. Install the I/P cluster trim panel. Refer to «Instrument Cluster Trim Panel Replacement»(ref-338119-S06648334112009081700000) .
  1. Remove the HVAC module. Refer to «HVAC Module Assembly Replacement»(ref-338121-S21941602662009081700000) .
  2. Disconnect all associated wiring connections attached to the HVAC module.
  3. Remove heater core. Refer to «Heater Core Replacement»(ref-338121-S39097033552009081700000) .
  4. Remove the right side air temperature actuator and linkage. Refer to «Temperature Valve Actuator Replacement - Right Side»(ref-338123-S04035793792009081700000) .
  5. Remove the HVAC module case screws.
  6. Remove the HVAC module retainer clips.
  7. Separate the HVAC module case.
  8. Reposition the evaporator core to access the evaporator sensor.
  9. Remove the evaporator sensor and harness from the evaporator core.
  1. Add refrigerant oil to the evaporator core. Refer to «Refrigerant System Capacities»(ref-338121-S30552112422009081700000) .
  2. Install the new evaporator core seals to evaporator.
  3. Install the evaporator sensor and harness to the evaporator.
  4. Install the evaporator core.
  5. Connect the HVAC module case halves together.
  6. Reposition and connect the HVAC Module wiring harness (1).
  7. Install the HVAC module retainer clips.
  8. Install the HVAC module case screws and tighten to 1 N.m (9 lb in).
  9. Install the right side air temperature actuator and linkage. Refer to «Temperature Valve Actuator Replacement - Right Side»(ref-338123-S04035793792009081700000) .
  10. Install the heater core. Refer to «Heater Core Replacement»(ref-338121-S39097033552009081700000) .
  11. Reconnect all associated wiring connections attached to the HVAC module.
  12. Install the HVAC module. Refer to «HVAC Module Assembly Replacement»(ref-338121-S21941602662009081700000) .

Scheme 21

Scheme 21: Outside Air Quality Sensor Replacement
Scheme 21: Outside Air Quality Sensor Replacement
CalloutComponent Name
1Radiator Support Sight Shield Retainer (Qty: 6)
2Front Compartment Front Sight Shield Assembly
3Radiator Grille Retainer (Qty: 4) Tip: By removing these 4 retainers allows the front fascia grille flexibility to be moved forward to access the air quality sensor.
4Air Quality Sensor Connector
5Air Quality Sensor Bolt CAUTION: Refer to Fastener Caution . Tighten: 9 N.m (80 lb in)
6Air Quality Sensor
CAUTION
Refer to Fastener Caution .
  1. Disconnect the ambient air temperature sensor electrical connector (1).
  2. Release the ambient air temperature sensor from the clip.
  3. Remove the ambient air temperature sensor from the vehicle.
  1. Place the ambient air temperature sensor in position.
  2. Engage the ambient air temperature sensor into the clip.
  3. Connect the ambient air temperature electrical connector (1).
  1. Remove the I/P cluster trim panel. Refer to «Instrument Cluster Trim Panel Replacement»(ref-338119-S06648334112009081700000) .
  2. Disconnect the aspirator hose (3) from the inside air temperature sensor (2).
  3. Disconnect the electrical connector (1) from the inside air temperature sensor (2).
  4. Disconnect the retaining clips and remove the inside air temperature sensor (2).
  1. Install the inside air temperature sensor (2).
  2. Connect the electrical connector (1) to the inside air temperature sensor (2).
  3. Connect the aspirator hose (3) to the inside air temperature sensor (2).
  4. Install the I/P cluster trim panel. Refer to «Instrument Cluster Trim Panel Replacement»(ref-338119-S06648334112009081700000) .
  1. Remove the defroster grille. Refer to «Defroster Grille Replacement»(ref-338121-S02552696252009081700000) .
  2. Remove the sunload sensor from the defroster grill by twisting the sensor 1/4 turn counter clockwise.
  3. Disconnect the sunload sensor electrical connector.
  4. Remove the sunload sensor.
  1. Connect the sunload sensor electrical connector.
  2. Install the sunload sensor to the defroster grille by twisting the sensor 1/4 turn clockwise.
  3. Install the defroster grille. Refer to «Defroster Grille Replacement»(ref-338121-S02552696252009081700000) .

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