This procedure covers the removal and replacement of the AC accumulator (receiver-drier) on a 2016-2024 Hyundai Tucson with the 2.5L I4 engine and AWD, including refrigerant recovery, component replacement, and system recharge.

Warnings

Tools required

Parts

• AC Accumulator (Receiver-Drier) × 1 — Use OEM specification for refrigerant type compatibility
• AC line O-ring kit × 1 — Includes multiple sizes for refrigerant lines
• PAG oil (PAG46 for R134a or POE oil for R1234yf) × 1 — Verify refrigerant type first
• R134a or R1234yf refrigerant × 1 — Check underhood label for type and capacity

Preparation

1. Verify the refrigerant type from the underhood AC specification label
2. Ensure engine is cold and vehicle is parked on level ground
3. Disconnect negative battery terminal and wait 3 minutes for airbag system discharge
4. Note the total refrigerant capacity from underhood label for recharge
5. Have replacement accumulator and O-rings ready to minimize moisture exposure time

Procedure

1. 1

   Recover refrigerant from AC system
   Connect AC recovery machine to service ports (low side on accumulator, high side near compressor). Follow recovery machine instructions to fully evacuate refrigerant from system. Verify recovery is complete when gauges show vacuum. Document the amount of refrigerant and oil recovered for recharge reference.
2. 2

   Remove engine cover and air intake
   Remove plastic engine cover by pulling upward on the clips. Loosen clamp on air intake tube at throttle body and remove intake tube to improve access to accumulator area. Set components aside.
3. 3

   Locate and access accumulator
   The accumulator is mounted on the passenger side firewall near the evaporator line connection. Remove any wire harness clips or brackets that may obstruct access. On some models, you may need to move the fuse box aside by removing its mounting bolts.
4. 4

   Disconnect refrigerant lines from accumulator
   Using appropriate flare nut wrenches (typically 14mm and 16mm), carefully disconnect the inlet line from evaporator and outlet line to compressor from the accumulator. Cap all open fittings immediately with plastic caps or tape to prevent moisture and contamination entry. Inspect O-rings on lines and note their condition.
   ⚠Work quickly to minimize moisture exposure once lines are disconnected. Have caps ready before opening lines.
5. 5

   Remove accumulator mounting bracket
   Remove the accumulator mounting bracket bolt(s) using a 10mm or 12mm socket. The accumulator may be held by a single bolt clamp or multiple bracket bolts depending on production year. Support the accumulator while removing the last fastener.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)
6. 6

   Remove old accumulator
   Carefully pull the accumulator away from the mounting location. Keep it upright and drain any residual oil into a graduated container to measure the amount. Note this quantity for replacement oil calculation. Inspect the old accumulator for signs of contamination or metal particles.
7. 7

   Prepare new accumulator
   Remove new accumulator from packaging only when ready to install. Add the appropriate type and amount of refrigerant oil to the new accumulator: add the same amount drained from old accumulator plus 20ml for replacement. Use PAG46 oil for R134a systems or POE oil for R1234yf systems. Do not overfill.
   ⚠Using incorrect oil type can damage the compressor and contaminate the system. Verify refrigerant type before adding oil.
8. 8

   Install new accumulator
   Position new accumulator in mounting bracket location, ensuring orientation matches original installation (inlet/outlet positions). Install mounting bracket and torque mounting bolts to specification. Verify accumulator is secure and properly positioned for line connection.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)
9. 9

   Install new O-rings and connect refrigerant lines
   Remove old O-rings from line fittings and discard. Install new O-rings from kit, ensuring correct size for each fitting. Lightly coat new O-rings with fresh refrigerant oil. Hand-thread line fittings onto accumulator ports to avoid cross-threading, then tighten to specification using flare nut wrenches.
   ⚠Do not reuse old O-rings. Cross-threading aluminum AC fittings will require expensive line replacement.
   Torque spec

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

    Reinstall air intake and engine cover
    Reinstall any brackets, fuse box mounting, or wire harness clips that were removed. Reinstall air intake tube to throttle body and secure clamp. Reinstall engine cover by pressing clips into place. Reconnect negative battery terminal.
11. 11

    Evacuate AC system
    Connect vacuum pump to AC system via manifold gauges. Evacuate system to achieve 29+ inches of mercury vacuum. Maintain vacuum for minimum 45 minutes to remove all moisture and air. Monitor for vacuum decay which would indicate a leak. If vacuum holds steady, system is ready for recharge.
    ⚠Inadequate evacuation time will leave moisture in system, reducing accumulator desiccant life and causing poor AC performance.
12. 12

    Recharge AC system
    Using refrigerant scale and manifold gauges, recharge system with the exact amount of refrigerant specified on underhood label (typically 450-650 grams depending on year). Charge through low-side port only with engine running and AC on maximum cold. Monitor gauge pressures and add refrigerant slowly. Do not overcharge.
    ⚠Overcharging the AC system can damage the compressor and reduce cooling efficiency. Use a scale for accurate measurement.

Reassembly

1. Verify all refrigerant line fittings are torqued to specification and show no signs of refrigerant oil seepage
2. Ensure all electrical connectors, brackets, and wire harness clips are reinstalled in original positions
3. Double-check that air intake system is properly secured and engine cover is fully seated

Verification

• Start engine and set AC to maximum cold, maximum fan speed, and recirculation mode
• Allow system to run for 5 minutes and verify cold air output at center vents (should be 40-50°F at vents)
• Check low-side pressure (should be 25-35 PSI at 75°F ambient) and high-side pressure (should be 200-250 PSI at 75°F ambient)
• Inspect all AC line connections for signs of oil leakage which would indicate refrigerant escape
• Use electronic leak detector around all fittings to verify no refrigerant leaks
• Verify compressor clutch engages and disengages properly during operation
• Test AC operation through full temperature range and verify consistent cooling performance

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