AC system recharge on a 2024 Tesla Model X Plaid. This vehicle uses an electric A/C compressor that is shared with the battery thermal management loop via the heat pump/octovalve system — recovery and recharge must be performed only at the low/high-side service ports, never by opening any refrigerant line.

Warnings

Tools required

Parts

• Service port valve core caps (replacement, if missing/damaged) × 2 — OEM-spec R-1234yf service port caps

Fluids

• R-1234yf refrigerant (verify exact charge weight on underhood A/C label)
• PAG oil compatible with electric A/C compressor (only if system was opened or oil loss is documented — refer to Tesla Service Manual for type and amount)

Preparation

1. Park on level ground, place in P, engage parking brake.
2. Exit ALL doors with key fob away from the vehicle. Wait at least 2 minutes for HV systems to fully de-energize, even on this non-HV job.
3. Disconnect the 12V low-voltage battery in the frunk (similar position to Model S). Remove frunk trim as needed to access the negative terminal.
4. DO NOT touch, cut, or pierce ANY orange cable — these are high-voltage and lethal.
5. If at any point you encounter an orange cable, an HV component, or are unsure if a system is de-energized: STOP and consult a Tesla-certified technician.
6. Lower the falcon doors and keep them closed throughout service. Block the door travel area to prevent injury if accidentally actuated.
7. Locate the underhood A/C service label and record the OEM refrigerant type (R-1234yf) and exact charge weight in grams.
8. Locate the high-side and low-side service ports under the frunk. Verify they are R-1234yf-spec couplers (not R-134a).

Procedure

1. 1

   Inspect A/C system for leaks and damage
   Visually inspect accessible A/C lines, condenser, and service port caps for oil residue, impact damage, or corrosion. If significant oil staining or refrigerant odor is present, perform a leak test before recharging — recharging a leaking system is wasteful and may damage the electric compressor.
2. 2

   Connect recovery/recharge machine
   Attach the high-side and low-side couplers of the R-1234yf recovery/recharge machine to the corresponding service ports. Ensure couplers are fully seated and locked. Do NOT mix up high and low side.
   ⚠Forcing an R-134a coupler onto an R-1234yf port can damage the valve core and cause refrigerant loss.
3. 3

   Recover existing refrigerant
   Run the recovery cycle on the machine until system pressure stabilizes at or below the machine's recovery target. Record the recovered refrigerant weight — this confirms whether the system was undercharged, fully charged, or overcharged.
4. 4

   Evacuate the system
   Pull a deep vacuum (typically 500 microns or lower, or per the Tesla Service Manual specification) and hold for at least 30 minutes to verify no leaks and to remove moisture. If vacuum decays, STOP and diagnose the leak before charging.
   ⚠Moisture inside the system will react with PAG oil and damage the electric compressor windings.
5. 5

   Add PAG oil only if required
   If the system was opened, lost a significant amount of refrigerant, or the recovered oil volume indicates loss, add the manufacturer-specified PAG oil in the manufacturer-specified quantity. For a routine top-up where the system was not opened, do NOT add oil. Refer to Tesla Service Manual for exact oil type and amount.
   ⚠️Using the wrong PAG oil can cause electrical short inside the high-voltage A/C compressor — refer to the Tesla Service Manual for the approved oil specification.
6. 6

   Charge to specified weight
   Program the recharge machine to the exact refrigerant weight printed on the underhood A/C label and run the charge cycle. Do not estimate by pressure alone — Tesla systems are weight-charged. Allow the machine to confirm completion.
7. 7

   Disconnect couplers and cap service ports
   Once charging is complete and the machine has cleared the lines, disconnect the high- and low-side couplers. Reinstall the service port valve caps — these are the secondary seal and must be present.
8. 8

   Reconnect 12V battery
   Reconnect the 12V negative terminal in the frunk. Reinstall any frunk trim removed for access. Close the frunk.
9. 9

   Functional test
   With the vehicle awake, set climate control to LO / max A/C with fan on high. Allow the system to run for several minutes. Verify cold air at center vents and that the compressor runs without abnormal noise. Check for any A/C or thermal-system fault messages on the touchscreen.
10. 10

    Final leak check
    With the system pressurized and running, use an electronic R-1234yf leak detector around accessible fittings, the condenser, and service ports. Pay attention to areas that showed prior oil residue.

Reassembly

1. Confirm both service port caps are installed and hand-tight.
2. Confirm frunk trim and 12V battery cover (if removed) are reinstalled.
3. Close frunk and verify latch.
4. Wipe down service ports and surrounding area to remove any oil residue that could attract dirt or trigger false leak readings later.

Verification

• Center vent temperature should drop substantially below ambient within a few minutes on max A/C (typical target is well below 10°C / 50°F at the vent in moderate ambient conditions — refer to Tesla Service Manual for exact spec).
• No A/C, climate, or thermal management alerts on the touchscreen after a full drive cycle.
• Compressor cycles smoothly with no buzzing, knocking, or surging audible from the frunk area.
• No refrigerant leak detected at fittings or service ports after operation.
• Note: A/C performance on Model X is tightly integrated with the heat pump and battery thermal loop. If cabin cooling is weak despite a correct charge weight, the issue is likely in the thermal management system (octovalve / heat pump) and requires Tesla Toolbox diagnostics — do NOT attempt further refrigerant-side service.

More procedures for this vehicle