This procedure covers the replacement of the AC low pressure switch on a 2018-2024 Toyota Camry with a 2.5L I4 engine, including refrigerant recovery and recharge.

Warnings

Tools required

Parts

• AC low pressure switch × 1 — Use OEM specification
• AC line O-rings × 2 — Use OEM specification

Fluids

• PAG oil for AC system — 0.1 qt
• R-134a refrigerant

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow engine to cool completely if recently operated
3. Ensure AC recovery/recharge machine is properly calibrated and ready
4. Open hood and secure with prop rod

Procedure

1. 1

   Recover AC refrigerant
   Connect AC recovery machine to service ports. Follow machine instructions to completely recover all refrigerant from the system. Record the amount of refrigerant and oil recovered for recharge reference. Wait until system reaches atmospheric pressure before proceeding.
   ⚠️System must be completely evacuated before opening any fittings. Verify zero pressure on gauges.
2. 2

   Locate AC low pressure switch
   The AC low pressure switch is located on the suction line (larger diameter line) near the firewall on the passenger side of the engine bay. It has an electrical connector and threads into the AC line. Identify the switch and trace the wiring harness.
3. 3

   Disconnect electrical connector
   Press the locking tab on the electrical connector and carefully pull the connector away from the AC low pressure switch. Move the wiring harness aside to provide clearance for switch removal.
4. 4

   Remove AC low pressure switch
   Using a wrench, carefully unthread the AC low pressure switch from the AC line fitting in a counterclockwise direction. Remove the switch completely. Inspect the O-ring seal on the line for damage.
5. 5

   Prepare new switch installation
   Remove and discard the old O-ring from the AC line port. Clean the sealing surface on the line fitting with a clean, lint-free cloth. Install a new O-ring onto the port, ensuring it seats properly in the groove. Apply a small amount of PAG oil to the O-ring to aid installation and prevent tearing.
   ⚠Do not use petroleum-based lubricants on AC system O-rings. Use only PAG oil compatible with the AC system.
6. 6

   Install new AC low pressure switch
   Thread the new AC low pressure switch into the AC line fitting by hand, turning clockwise until finger-tight. Use a torque wrench to tighten the switch to the specified torque value. Do not overtighten as this can damage the threads or crack the switch body.
   Torque spec

   AC Line Fittings20 Nm (15 lb-ft)
7. 7

   Reconnect electrical connector
   Push the electrical connector firmly onto the new AC low pressure switch until you hear or feel a positive click, indicating the locking tab has engaged. Gently tug on the connector to verify it is securely attached.
8. 8

   Evacuate AC system
   Connect the AC recovery/recharge machine to the service ports. Run a vacuum on the system for a minimum of 30 minutes to remove all air and moisture. Monitor the vacuum gauge to ensure the system holds vacuum without decay, which would indicate a leak.
9. 9

   Recharge AC system
   Using the AC recovery/recharge machine, add the correct amount of refrigerant and PAG oil as specified by Toyota for the 2018-2024 Camry 2.5L I4 system (refer to underhood label for exact capacity). Allow machine to complete the recharge cycle and verify proper amounts were added.

Reassembly

1. Verify all electrical connections are secure and properly routed
2. Ensure no tools or parts were left in engine bay
3. Close hood securely

Verification

• Start the engine and turn AC system to maximum cold setting
• Verify AC compressor engages and cycles normally
• Check that both high and low pressure readings are within normal range (approximately 25-45 PSI low side at idle)
• Confirm cold air is blowing from vents at proper temperature
• Inspect AC low pressure switch area for any signs of refrigerant leaks using leak detection equipment
• Verify AC low pressure switch connector is secure and no warning lights are illuminated on dash

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