This procedure covers the replacement of the AC compressor clutch assembly on a 2016-2021 Honda Civic with the 1.5L turbocharged engine, including refrigerant recovery, clutch replacement, and system recharge.

Warnings

Tools required

Parts

• AC compressor clutch assembly × 1 — Use OEM Honda part or quality aftermarket
• AC line O-rings × 2 — Use OEM specification
• PAG 46 oil for AC system × 1 — Honda or compatible PAG 46
• R-134a refrigerant × 1 — As required by system capacity

Preparation

1. Park vehicle on level ground and engage parking brake
2. Disconnect negative battery terminal and wait 3 minutes for system discharge
3. Raise front of vehicle and secure on jack stands
4. Remove engine under cover/splash shield
5. Allow engine to cool completely if recently operated

Procedure

1. 1

   Recover AC refrigerant
   Connect AC recovery machine to service ports. Recover all refrigerant from the system according to machine instructions. Record the amount of refrigerant and oil recovered for proper recharge later. Wait 5 minutes after recovery completes to ensure system is fully depressurized.
2. 2

   Remove serpentine belt
   Locate the belt tensioner on the front of the engine. Using a 14mm socket, rotate the tensioner clockwise to release tension. Slide the serpentine belt off the AC compressor pulley, then off remaining pulleys. Inspect belt for wear and replace if necessary.
3. 3

   Disconnect AC lines from compressor
   Using flare nut wrenches, carefully loosen and disconnect both AC line fittings from the compressor. Cap or plug all open fittings immediately to prevent moisture and debris entry. Discard old O-rings. Drain and measure any oil that comes out of the lines.
   Torque spec

   AC Line Fittings20 Nm (15 lb-ft)
4. 4

   Disconnect compressor electrical connector
   Locate the electrical connector on the compressor clutch coil. Press the tab and disconnect the connector. Move the wiring harness aside to provide access to the compressor.
5. 5

   Remove compressor from engine
   Support the compressor with one hand. Remove the compressor mounting bolts (typically 3-4 bolts). Carefully remove the compressor from the engine bay and place on a clean work surface. Note the orientation for reinstallation.
   Torque spec

   Compressor Bolts32 Nm (24 lb-ft)
6. 6

   Remove clutch snap ring
   With the compressor secured on a bench, use snap ring pliers to remove the large snap ring that retains the clutch hub on the compressor shaft. Keep the snap ring in a safe place if reusing.
7. 7

   Remove clutch hub and pulley assembly
   Using a clutch hub puller or holding tool, carefully remove the clutch hub from the compressor shaft. Take care not to damage the shaft surface. Remove the clutch plate and shims (note shim thickness and quantity). Remove the pulley bearing assembly by removing the retaining snap ring.
8. 8

   Remove and replace clutch coil
   Remove the bolts securing the clutch coil to the compressor front head (typically 3 small bolts). Carefully pull the coil assembly off the compressor. Install the new clutch coil, ensuring it seats properly against the compressor face. Tighten bolts in a star pattern.
9. 9

   Install new clutch assembly
   Install the new pulley bearing assembly and secure with snap ring. Install the clutch plate with original shims onto the compressor shaft. Install the clutch hub and secure with the snap ring. Ensure all components are fully seated.
10. 10

    Set clutch air gap
    Using a feeler gauge, measure the air gap between the clutch plate and pulley face at 3-4 points around the circumference. The gap should be 0.35-0.50mm (0.014-0.020 inches). Add or remove shims as needed to achieve proper clearance. Recheck gap after adjustment.
    ⚠Incorrect air gap will cause clutch slippage or failure to engage. Verify at multiple points around the clutch.
11. 11

    Reinstall compressor to engine
    Position the compressor back into its mounting location. Hand-start all mounting bolts before tightening. Tighten compressor mounting bolts to specification in a cross pattern.
    Torque spec

    Compressor Bolts32 Nm (24 lb-ft)
12. 12

    Reconnect electrical connector
    Reconnect the electrical connector to the clutch coil. Ensure it clicks into place and the locking tab is fully engaged.
13. 13

    Install new O-rings and reconnect AC lines
    Install new O-rings on both AC line fittings, lightly lubricating them with fresh PAG 46 oil. Add the appropriate amount of fresh PAG oil to the compressor through the suction port (typically 30-50ml total system replacement oil minus what was recovered). Reconnect both AC lines to the compressor and tighten fittings to specification using flare nut wrenches.
    Torque spec

    AC Line Fittings20 Nm (15 lb-ft)
14. 14

    Reinstall serpentine belt
    Route the serpentine belt around all pulleys according to the belt routing diagram (typically on the radiator support). Rotate the tensioner clockwise and slide the belt onto the final pulley. Release tensioner slowly and verify belt is properly seated on all pulleys.
15. 15

    Evacuate and recharge AC system
    Connect AC service machine to both service ports. Evacuate the system for at minimum 30 minutes to remove all moisture and air. Perform leak check if machine has this capability. Recharge system with the correct amount of R-134a refrigerant per factory specifications (verify on underhood label, typically 400-500g). Add UV dye if desired for future leak detection.

Reassembly

1. Reinstall engine under cover/splash shield
2. Lower vehicle from jack stands
3. Reconnect negative battery terminal
4. Start engine and verify no unusual noises from compressor area

Verification

• Start the engine and turn AC to maximum cold with fan on high
• Verify clutch engages audibly and visually when AC is turned on
• Check for proper cooling at dash vents (should reach 40-45°F at full cold)
• Inspect all AC line fittings for signs of oil leakage
• Verify no abnormal noises from compressor or clutch during operation
• Check clutch cycles on/off properly as system reaches temperature
• Monitor system pressures with gauges to confirm proper operation (low side 25-35 PSI, high side 200-250 PSI at idle with ambient 75-80°F)

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