This procedure covers the replacement of the AC hose assembly on a 2015-2020 Ford F-150 with the 5.0L V8 Coyote engine, including refrigerant recovery, hose removal, installation with new O-rings, and system recharge.

Warnings

Tools required

Parts

• AC hose assembly (specify which hose: suction, discharge, or liquid line) × 1 — Use OEM specification
• AC line O-ring kit × 1 — Use OEM specification
• PAG oil (compatible with R-134a) × 1 — Motorcraft YN-12-C or equivalent

Fluids

• R-134a refrigerant — 0.875 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Allow engine to cool completely if recently operated
3. Disconnect negative battery terminal to prevent fan operation during service
4. Identify which AC hose assembly requires replacement (suction line, discharge line, or liquid line from condenser to evaporator)
5. Photograph hose routing, bracket locations, and connections for reference during installation
6. Verify replacement hose matches original in length, fitting orientation, and routing configuration

Procedure

1. 1

   Recover AC refrigerant
   Connect AC recovery machine to service ports. Follow machine instructions to recover all refrigerant from the system. Record amount recovered for recharge reference. System should contain approximately 28 oz (0.875 qt) of R-134a. Allow system to stabilize and verify complete recovery.
2. 2

   Access AC hose assembly
   For discharge/suction hoses: Remove engine cover by pulling upward on retaining clips. For liquid line replacement: Remove grille or access panel as needed depending on hose location. On 5.0L V8, discharge and suction hoses connect to compressor on passenger side of engine. Remove any wire harness clips or brackets obstructing access to hose connections.
3. 3

   Disconnect hose at compressor (if applicable)
   Using appropriate line wrench or disconnect tool, loosen AC line fitting at compressor connection. For spring-lock couplings, use proper disconnect tool to release the internal garter spring before pulling lines apart. Cap or plug open fittings immediately to prevent moisture and debris entry. Discard old O-rings.
   ⚠Even after recovery, residual refrigerant or oil may be present. Wear safety glasses and gloves.
4. 4

   Remove mounting brackets and clips
   Remove bolts securing AC hose mounting brackets to engine or frame. Typical locations include brackets near firewall, along frame rail, and near condenser. Note bracket positions and hardware for reinstallation. On 5.0L V8 F-150, hoses typically have 2-4 mounting points depending on which line is being replaced.
   Torque spec

   Mounting Bracket Bolts30 Nm (22 lb-ft)
5. 5

   Disconnect hose at evaporator or condenser end
   Locate connection point at firewall (evaporator) for liquid/suction lines or at condenser for discharge line. Use line disconnect tool or wrench to separate fitting. For connections inside engine bay at firewall, access may require moving wiring harnesses or other hoses aside. Cap all open ports immediately. Remove hose assembly from vehicle following documented routing path.
6. 6

   Inspect and clean connection points
   Examine all fitting seats and connection points for damage, corrosion, or debris. Clean fitting surfaces with lint-free cloth. Check compressor, condenser, and evaporator ports for damage or debris. Verify threads on threaded fittings are clean and undamaged. Any damaged components must be addressed before installing new hose.
7. 7

   Prepare new AC hose assembly
   Remove protective caps from new hose assembly only when ready to install. Install new O-rings on all connections. Coat O-rings lightly with clean PAG oil (typically 1-2 drops per O-ring). For spring-lock connections, install new O-rings in garter spring coupling. Verify hose routing will match original path without kinks or contact with hot/sharp components.
   ℹ️Keep all connections capped until immediately before assembly to prevent moisture contamination. Moisture in AC system causes corrosion and poor performance.
8. 8

   Route and position new hose assembly
   Route new AC hose following original path as documented in photos. Ensure hose does not contact exhaust manifolds, sharp edges, or moving components. Position mounting brackets at original locations. Verify hose has adequate clearance from serpentine belt and pulleys. On 5.0L V8, maintain minimum 1 inch clearance from exhaust manifolds.
9. 9

   Connect hose to compressor
   Remove cap from compressor port and hose end. Verify O-ring is properly seated and lubricated. For threaded fittings, hand-tighten completely before using wrench. For spring-lock couplings, push connection together firmly until you hear/feel the garter spring click into place, then pull back to verify engagement. Torque threaded AC line fittings to specification.
   Torque spec

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

    Connect hose to condenser or evaporator
    Remove caps from second connection point. Install with lubricated O-rings as before. Hand-tighten threaded fittings completely, then torque to specification. For spring-lock fittings, ensure positive engagement. Do not over-tighten fittings as this can damage O-rings or aluminum threads.
    Torque spec

    AC Line Fittings20 Nm (15 lb-ft)
11. 11

    Install mounting brackets
    Install all mounting bracket bolts at documented locations. Ensure hose sits properly in bracket clips without stress or tension. Torque mounting bracket bolts to specification. Verify hose has no contact points with vehicle components and maintains proper clearances. Reinstall any wire harness clips or other components moved during access.
    Torque spec

    Mounting Bracket Bolts30 Nm (22 lb-ft)
12. 12

    Vacuum and recharge AC system
    Connect AC machine to service ports. Pull vacuum on system for minimum 30 minutes, preferably 45 minutes. System should hold vacuum without decay for at least 10 minutes after pump stops - this verifies no leaks. Add appropriate amount of PAG oil if system was significantly low or if compressor requires additional oil per service information. Charge system with R-134a to specification (approximately 28 oz). Monitor pressures during charging.
    ⚠If system will not hold vacuum, there is a leak. Do not charge system until leak is found and repaired.
13. 13

    Leak test and system verification
    With system charged, use electronic leak detector or UV light (if UV dye was added) to check all connection points for leaks. Start engine and turn AC to maximum cold. Verify compressor engages and system produces cold air. Check high and low side pressures are within specification (typical: 25-35 psi low side, 200-250 psi high side at idle with 80°F ambient). Monitor for 5-10 minutes of operation.
14. 14

    Final inspection and reinstallation
    With AC operating, verify no unusual noises from compressor or hose vibration. Shut off engine and reconnect negative battery terminal. Reinstall engine cover and any removed panels or grille components. Perform final visual inspection of hose routing and clearances. Clean any spilled PAG oil from engine components.

Reassembly

1. Ensure all mounting brackets are torqued to specification and hose is properly secured
2. Verify AC line fittings are torqued correctly - over-tightening can damage aluminum threads
3. Confirm hose routing matches original path with no contact points or inadequate clearances
4. Reinstall all panels, covers, and components removed for access

Verification

• Start engine and activate AC system. Verify compressor clutch engages and disengages normally
• Check that center dash vents produce cold air within 2-3 minutes of operation
• Verify low side pressure is 25-35 psi and high side is 200-250 psi at idle with 80°F ambient temperature
• Inspect all connections with leak detector - no leaks should be present
• Verify no unusual noises, vibrations, or hose contact with other components
• Test AC performance at various engine speeds and blower settings
• Confirm system maintains pressure after overnight sit - recheck for leaks if pressure drops

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