hvac

AC Pressure Sensor

for 2015 Ford F-150 3.5L V6 EcoBoost · RWD

Difficulty

Easy

Time

36 min

Tools

Steps

This procedure covers the replacement of the AC pressure sensor on the 2015-2020 Ford F-150 with 3.5L EcoBoost engine, which monitors refrigerant pressure for proper AC system operation.

Warnings

⚠️AC refrigerant must be recovered by certified technician using proper equipment. Venting refrigerant to atmosphere is illegal and environmentally harmful.

⚠AC system operates under high pressure. Never loosen fittings without first recovering refrigerant.

⚠Contact with refrigerant can cause frostbite. Wear gloves and safety glasses.

Tools required

10mm socket and ratchetEssential

Torque wrenchEssential

AC manifold gauge set

AC recovery/recharge machineEssential

Safety glassesEssential

Work glovesEssential

Shop towelsEssential

Parts

AC pressure sensor × 1 — Use OEM specification
AC line O-rings × 2 — Use OEM specification

Fluids

R-134a refrigerant
PAG 46 oil

Preparation

Park vehicle on level surface and engage parking brake
Allow engine to cool completely if recently operated
Have AC system professionally evacuated and refrigerant recovered
Verify replacement sensor matches original part number
Open hood and secure in upright position

Procedure

1
Locate AC pressure sensor
The AC pressure sensor is located on the high-pressure AC line near the condenser on the passenger side of the engine bay. It is a small cylindrical sensor with an electrical connector and threaded into the AC line.
2
Disconnect electrical connector
Press the tab on the electrical connector and carefully pull it away from the AC pressure sensor. Do not pull on the wiring harness itself, only the connector body.
3
Remove AC pressure sensor
Using a 10mm socket, carefully unthread the AC pressure sensor from the high-pressure line. Turn counterclockwise to remove. Be prepared for a small amount of residual oil to leak out. Have a shop towel ready to catch any drips.
4
Inspect and clean sensor port
Inspect the sensor port threads for damage or debris. Clean the port opening with a clean shop towel. Check the condition of the O-ring sealing surface and remove the old O-ring if still in place.
5
Install new O-rings
Install new O-rings onto the replacement AC pressure sensor. Lightly coat the O-rings with fresh PAG oil to ensure proper sealing and ease of installation. Do not use excessive oil.
6
Install new AC pressure sensor
Thread the new AC pressure sensor into the high-pressure line by hand, turning clockwise until finger-tight. Ensure the sensor threads in smoothly without cross-threading. Then use a 10mm socket and torque wrench to tighten to specification.
Torque spec
AC Line Fittings20 Nm (15 lb-ft)
7
Reconnect electrical connector
Push the electrical connector onto the new AC pressure sensor until you hear and feel a positive click. Gently tug on the connector to verify it is fully seated and locked in place.
8
Recharge AC system
Have the AC system professionally evacuated to remove air and moisture, then recharged to the proper refrigerant capacity specification using AC recovery/recharge equipment. The system should be evacuated for at least 30 minutes before recharging.

Reassembly

Verify all electrical connections are secure and properly seated
Ensure no tools or materials are left in engine bay
Close hood securely

Verification

Start engine and turn AC system to maximum cooling
Verify AC compressor engages and system operates normally
Check for any refrigerant leaks around the new sensor using leak detector or soap solution
Monitor AC system pressure readings using scan tool to confirm sensor is reporting accurate values
Verify cold air is blowing from vents and system pressure is within normal range (typically 200-250 PSI on high side at idle)
Test AC operation for at least 10 minutes to ensure stable performance