AC Compressor Oil Add

This procedure adds the correct amount of compressor oil to the electric AC compressor system on the 2022 Rivian EDV 500, ensuring proper lubrication and system longevity.

Warnings

Tools required

Parts

• PAG oil for electric AC compressor (Rivian approved) × 1 — Use OEM specification
• AC system O-rings (replacement set) × 1 — Use OEM specification
• R1234yf refrigerant × 1 — As needed to recharge

Preparation

1. Park vehicle on level ground and engage parking brake
2. Ensure vehicle is in Service Mode per Rivian diagnostic tool instructions
3. Access the HV disconnect location behind rear seat and disable high voltage system
4. Wait 5 minutes after HV disconnect, then verify zero voltage at HV junction box using insulated multimeter
5. Place HV safety lockout tags on steering wheel and HV disconnect
6. Open all doors and ensure adequate ventilation in work area
7. Verify AC recovery machine is certified for R1234yf and has fresh oil in separator
8. Connect Rivian diagnostic scan tool and document current AC system performance data
9. Check service records to determine if compressor oil was previously added or if system was opened for repairs

Procedure

1. 1

   Connect AC recovery equipment
   Connect the AC recovery/recharge machine to the high and low pressure service ports located in the front compartment near the motor bay area. The low pressure port is on the larger diameter line (suction side) and the high pressure port is on the smaller line (discharge side). Ensure connections are secure and leak-free.
2. 2

   Record baseline system charge
   Using the diagnostic scan tool, record the current refrigerant charge amount and system pressures. Note the compressor runtime hours if available. This baseline data is critical for determining proper oil quantity to add.
3. 3

   Recover refrigerant from system
   Using the AC recovery machine, completely recover all R1234yf refrigerant from the system into approved storage cylinder. Allow recovery process to run until machine indicates complete evacuation (typically 15-20 minutes). Record the exact amount of refrigerant removed for recharging later.
4. 4

   Access electric AC compressor
   Remove the front frunk liner and service panel to access the electric AC compressor mounted in the front motor compartment. The compressor is an integrated electric unit with HV connections. Remove plastic covers and acoustic shields as needed for access. Take photos of wiring routing for reassembly.
5. 5

   Disconnect compressor electrical connections
   With HV system verified disabled, carefully disconnect the electrical connector from the electric compressor. This is a sealed connector with a locking tab - press release tab and pull straight out. Inspect connector for corrosion or damage.
6. 6

   Remove compressor refrigerant lines
   Using appropriate socket, carefully loosen and remove the refrigerant line fittings from the compressor discharge and suction ports. Cap all open ports immediately with protective caps to prevent moisture and contamination entry. Inspect O-rings and replace if damaged or flattened.
7. 7

   Drain existing compressor oil
   Remove the compressor oil drain plug (if equipped) or use the suction port to drain existing oil into a clean graduated container. Measure the exact amount of oil removed. If less than 50ml was removed, system likely has insufficient oil. If more than 200ml, system may be overfilled or contaminated.
8. 8

   Calculate correct oil quantity
   Consult Rivian service data for total system oil capacity (typically 120-150ml for electric compressor systems). Subtract the amount of oil recovered. Add this difference plus any additional oil specified if components were replaced. For routine maintenance with no component replacement, verify system contains proper total amount.
9. 9

   Inject measured compressor oil
   Using the AC oil injector tool, measure the exact calculated amount of Rivian-approved PAG oil. Connect the injector to the compressor suction port and slowly inject the oil into the compressor housing. Rotate the compressor shaft by hand several times to distribute oil internally.
10. 10

    Reinstall refrigerant lines
    Install new O-rings on both refrigerant line fittings, lightly lubricating with PAG oil. Reconnect the suction and discharge lines to the compressor, tightening by hand first, then using torque wrench to proper specification per Rivian service manual (typically 18-25 ft-lbs, but verify).
11. 11

    Reconnect compressor electrical
    Reconnect the electrical connector to the compressor, ensuring it clicks fully into locked position. Verify proper seating by gently pulling on connector - it should not separate.
12. 12

    Evacuate AC system
    Connect vacuum pump to AC service ports through manifold gauges. Evacuate the system to at least 500 microns vacuum. Hold vacuum for minimum 30 minutes to verify system has no leaks and all moisture is removed. If vacuum does not hold, locate and repair leak before proceeding.
13. 13

    Recharge refrigerant system
    Using the AC recharge machine and digital scale, slowly recharge the system with the exact amount of R1234yf refrigerant that was recovered, or the amount specified on the vehicle underhood label (typically 1.8-2.2 lbs for EDV 500). Monitor pressures throughout charging process.
14. 14

    Restore HV power and test system
    Reinstall any removed covers and panels. Reconnect the HV system and remove lockout tags. Exit Service Mode using diagnostic tool. Start the vehicle and activate AC system at maximum cooling. Monitor compressor operation, current draw, and system pressures using scan tool. Allow system to run for 10 minutes, checking for proper cooling, unusual noises, and leaks at all connections.

Reassembly

1. Reinstall all acoustic shields and plastic covers in reverse order of removal
2. Verify all electrical connections are secure and properly routed
3. Reinstall front frunk liner and ensure proper fitment
4. Clear any service mode flags or fault codes using diagnostic scan tool

Verification

• Using scan tool, verify AC system pressures are within specification (typically 25-35 psi low side, 180-250 psi high side at ambient temperature)
• Confirm compressor current draw is normal (typically 5-12 amps depending on load)
• Verify vent temperatures reach proper cooling levels (typically 38-42°F at max cooling)
• Check for any refrigerant leaks at all connection points using electronic leak detector
• Perform test drive and verify AC system operates normally under various conditions
• Document final refrigerant charge amount and compressor oil quantity in service records

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