Replace the AC pressure sensor on the high-side AC line to restore proper AC system monitoring and compressor clutch engagement.

Warnings

Tools required

Parts

• AC pressure sensor × 1 — Use OEM specification
• O-ring for pressure sensor port × 1 — Use OEM specification

Fluids

• PAG oil for AC system — 0.1 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn off engine and remove key from ignition
3. Allow engine bay to cool if vehicle was recently operated
4. Have AC system refrigerant professionally recovered at a certified facility
5. Open hood and secure with prop rod

Procedure

1. 1

   Locate AC pressure sensor
   The AC pressure sensor is located on the high-side AC line near the firewall on the passenger side of the engine bay. It is a small cylindrical sensor with a 2-pin electrical connector and threaded mounting into the AC line. Identify the sensor and trace the wiring harness to confirm location.
2. 2

   Disconnect electrical connector
   Press the locking tab on the electrical connector and carefully pull the connector away from the AC pressure sensor. Use an electrical connector removal tool if needed to release stubborn tabs. Do not pull on the wires themselves.
3. 3

   Remove old pressure sensor
   Using a 10mm socket, carefully unthread the AC pressure sensor from the high-side AC line port. Turn counterclockwise to remove. Have a shop towel ready to catch any residual refrigerant oil that may drip from the port. Once removed, inspect the old O-ring for damage.
4. 4

   Prepare new sensor and port
   Clean the AC line port threads with a clean shop towel. Install the new O-ring onto the new AC pressure sensor. Apply a small amount of PAG oil to the O-ring to ensure proper sealing. Verify the sensor threads are clean and undamaged.
5. 5

   Install new pressure sensor
   Thread the new AC pressure sensor into the high-side AC line port by hand, turning clockwise. Ensure the sensor threads smoothly without cross-threading. Hand-tighten until the sensor is snug and the O-ring contacts the sealing surface.
   Torque spec

   AC Line Fittings20 Nm (15 lb-ft)
6. 6

   Torque pressure sensor to specification
   Using a torque wrench with 10mm socket, tighten the AC pressure sensor to 20.0 Nm (15.0 lb-ft). Do not over-torque as this can damage the AC line threads or crack the sensor body. Verify the sensor is fully seated.
7. 7

   Reconnect electrical connector
   Push the electrical connector onto the new AC pressure sensor until you hear or feel a positive click, indicating the locking tab has engaged. Gently tug on the connector to verify it is securely locked in place.

Reassembly

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

Verification

• Have the AC system professionally recharged to proper refrigerant capacity
• Start engine and turn AC system to maximum cooling
• Verify AC compressor engages and disengages normally
• Check for refrigerant leaks at the pressure sensor using a leak detector
• Confirm cold air is blowing from vents and system pressure readings are within normal range
• Verify no warning lights or AC-related fault codes are present using a scan tool

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