This procedure covers the removal and replacement of the AC compressor on a 2011-2014 Ford F-150 with the 3.5L EcoBoost V6 engine, including refrigerant recovery, compressor replacement, and system recharge.

Warnings

Tools required

Parts

• AC Compressor with clutch assembly × 1 — Use OEM specification for 3.5L EcoBoost
• AC line O-ring kit × 1 — R-134a compatible HNBR O-rings
• PAG 46 compressor oil × 1 — 8 oz bottle recommended
• R-134a refrigerant × 1 — Typically 1.75-2.0 lbs for system
• Serpentine belt × 1 — Replace if worn or contaminated with oil

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery cable and wait 2 minutes for system capacitor discharge
3. Verify AC system pressure is stable (no active leaks) before recovery
4. Connect AC recovery machine following manufacturer instructions
5. Recover all refrigerant from system and record amount removed for recharge reference
6. Measure and record PAG oil recovered (if machine has this capability)
7. Allow vehicle to cool completely if recently operated

Procedure

1. 1

   Remove serpentine belt
   Locate the belt tensioner on the passenger side of the engine. Using a serpentine belt tool or 1/2 inch breaker bar, rotate the tensioner clockwise to release tension. Slide the belt off the AC compressor pulley first, then release tensioner and remove belt from remaining pulleys. Inspect belt for oil contamination or damage and replace if necessary.
2. 2

   Disconnect compressor electrical connector
   Locate the AC compressor clutch electrical connector on the front of the compressor. Press the red locking tab and pull connector straight out from compressor clutch coil. Move wiring harness aside to prevent damage during compressor removal.
3. 3

   Remove AC line fittings from compressor
   Identify the suction (larger) and discharge (smaller) line connections on the rear of the compressor. Using appropriate wrenches, loosen and remove both AC line fittings from the compressor. Immediately cap all open ports with plastic shipping caps or tape to prevent moisture and contamination entry. Remove and discard old O-rings from the lines.
   ⚠Some residual oil may drain from lines. Position drain pan underneath to catch fluid.
4. 4

   Remove compressor mounting bolts
   The compressor is secured with three mounting bolts accessible from the front of the engine. Remove the upper bolt, then the lower two bolts. Support the compressor weight while removing the final bolt to prevent it from falling.
5. 5

   Remove AC compressor from vehicle
   Carefully maneuver the compressor forward and out of the engine bay. The compressor must be tilted and rotated to clear surrounding components. Once removed, hold compressor level over drain pan and remove the drain plug (if equipped) or tilt to drain residual oil from suction port. Measure and record the amount of oil drained.
6. 6

   Prepare new compressor
   New compressors typically come pre-filled with shipping oil. Check manufacturer instructions - most require draining this oil before installation. Rotate the compressor clutch hub by hand several times to distribute internal oil. Calculate correct PAG oil amount: if old compressor drained less than 3 oz, add 3 oz to new compressor. If old compressor drained 3-5 oz, match that amount. If system had a major leak or no oil was recovered, add 6 oz total.
   ℹ️Ford specifies PAG 46 oil for EcoBoost AC systems. Do not use other PAG viscosities or PAO oils.
7. 7

   Add PAG oil to new compressor
   Pour the measured amount of fresh PAG 46 oil into the suction port (larger port) of the new compressor. Rotate the clutch hub 10 complete revolutions by hand to distribute oil internally. Keep all ports capped when not actively working with them.
8. 8

   Install new compressor
   Remove shipping caps from new compressor immediately before installation. Maneuver compressor into position, reversing removal path. Align mounting holes and start all three mounting bolts by hand before tightening any of them. Tighten the compressor mounting bolts to specification in a crossing pattern to ensure even seating.
9. 9

   Install new O-rings and connect AC lines
   Coat new O-rings lightly with fresh PAG oil and install them in the grooves on both AC line fittings. Visually verify O-rings are seated properly with no twists or damage. Remove caps from compressor ports immediately before connection. Hand-thread each fitting onto the compressor to prevent cross-threading, then tighten to specification using two wrenches (one to hold compressor port, one to turn fitting).
   ⚠Do not over-tighten fittings. Excessive torque can damage compressor port threads or crush O-rings causing leaks.
   Torque spec

   AC Line Fittings20 Nm (15 lb-ft)
10. 10

    Reconnect electrical connector
    Push the compressor clutch electrical connector firmly onto the clutch coil until it clicks into place. Verify the red locking tab is fully engaged. Gently tug on connector to confirm secure connection.
11. 11

    Install serpentine belt
    Route new or existing belt around all pulleys except the AC compressor pulley, following the belt routing diagram on the radiator shroud. Rotate the tensioner clockwise using belt tool or breaker bar, then slide belt onto AC compressor pulley. Slowly release tensioner to apply proper tension. Verify belt is centered on all pulleys and seated correctly in all grooves.
12. 12

    Reconnect battery and perform vacuum test
    Reconnect negative battery cable. Connect AC service machine and evacuate system to 29+ inches of mercury vacuum for minimum 30 minutes (45 minutes recommended for new compressor). After vacuum period, close valves and monitor for 10 minutes - vacuum should not drop more than 1 inch, indicating system is leak-free and moisture has been removed.
    ⚠If vacuum drops significantly during hold test, system has a leak. Do not proceed with charging - find and repair leak first.
13. 13

    Recharge AC system
    With vacuum still held, recharge system with R-134a refrigerant. Use the amount recovered initially as a baseline, typically 1.75-2.0 lbs for this system (verify exact specification on underhood AC label). Add refrigerant through low-side service port only. Once charged, disconnect service machine and install service port caps.

Reassembly

1. Verify all AC line connections are tight and not leaking
2. Confirm serpentine belt is properly routed and tensioned
3. Ensure no tools or parts were left in engine bay
4. Double-check that compressor electrical connector is fully engaged

Verification

• Start engine and turn AC to maximum cold with blower on high
• Verify compressor clutch engages (listen for click and observe clutch plate rotation)
• Check for abnormal noises from compressor during operation
• Use digital thermometer to measure vent temperature - should reach 38-42°F within 5 minutes in ambient temperatures above 70°F
• Inspect all AC line connections for oil residue indicating leaks
• Verify cooling performance remains consistent after 15 minutes of operation
• Check system pressures with gauge set: low side should be 25-45 PSI, high side 200-250 PSI at idle in 75-80°F ambient temperature

More procedures for this vehicle