Replacement/service of the heat pump assembly on a 2024 Tesla Model X Plaid. This is a PROFESSIONAL-ONLY procedure that requires Tesla Toolbox software to safely depressurize and bleed the integrated battery/motor/cabin thermal loop; DIY attempts risk catastrophic HV battery damage.

Warnings

Tools required

Parts

• Heat pump assembly (manufacturer-specified for 2024 Model X) × 1 — Tesla OEM heat pump module — verify by VIN
• Refrigerant line O-rings / seal kit × 1 — OEM heat pump seal kit
• Coolant line quick-connect retainers (as needed) × 1 — OEM-spec retainers
• Hose clamps (replace any disturbed single-use clamps) × 4 — OEM-spec

Fluids

• Tesla Battery/Motor Coolant (G-48 spec) — 10 qt
• R-1234yf refrigerant (charge per under-hood label)
• Refrigerant oil (PAG/POE per Tesla spec for electric A/C compressor)

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 (lift frunk liner, remove cover, disconnect negative terminal first).
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. Connect Tesla Toolbox and place the vehicle in Service Mode. Use Toolbox to command the thermal system into 'Service / Coolant Drain' state to depressurize the integrated loop and isolate the HV battery cooling circuit.
7. Place Falcon doors in Service Mode via the touchscreen to prevent unintended movement.
8. Recover R-1234yf refrigerant from the A/C system using approved recovery equipment. Record charge weight removed.
9. Raise the vehicle on a lift using Tesla-approved lift pad locations; the air suspension must be in Jack Mode (set via touchscreen) before lifting.
10. Remove front underbody shield(s) and any front fascia/aero panels needed to access the heat pump bay per the manufacturer service manual.

Procedure

1. 1

   Verify thermal system depressurized via Toolbox
   Confirm in Toolbox that battery loop pressure has been bled and the system is in Service state. Do not proceed until pressure readings on the diagnostic screen match service spec. Cap or isolate the HV battery coolant ports per the service manual to prevent ingress.
   ⚠️If Toolbox cannot confirm depressurization, STOP. Opening a pressurized battery loop can drive coolant into the HV pack and cause a $15,000+ failure or thermal event.
2. 2

   Drain coolant from the heat pump circuit
   Position catch pans below the lowest coolant line on the heat pump. Open the manufacturer-specified drain/bleed point and allow coolant to drain into a clean, labeled container. Capacity for the full system is approximately 10.0 qt of Tesla G-48 coolant; expect a partial drain when only the heat pump is opened.
   ⚠️Coolant from the HV battery loop may have been in contact with battery cooling plates. Treat as potentially conductive — keep away from any orange HV cabling, HV connectors, or the underside of the pack.
3. 3

   Disconnect low-voltage harnesses at the heat pump
   Identify and unclip the low-voltage (black) connectors on the heat pump assembly: control valves, temperature/pressure sensors, and motor leads for the integrated pump(s). Photograph routing before disconnecting. Do not pull on wires — release locking tabs only.
   ⚠Any orange cable encountered is HV. Stop and consult a Tesla-certified technician — heat pump LV harnesses are black/grey only.
4. 4

   Disconnect refrigerant lines
   With refrigerant fully recovered, remove the manufacturer-specified bolt(s) securing each refrigerant line block to the heat pump. Separate the line carefully and immediately cap both sides to prevent moisture ingress. Discard old O-rings — replace with new from the seal kit.
   ⚠Residual refrigerant and oil may spray. Wear eye protection.
   Torque spec

   Bracket Bolts20 Nm (15 lb-ft)
5. 5

   Disconnect coolant lines from the heat pump
   Release each coolant quick-connect or hose clamp at the heat pump ports. Label each line (battery loop, powertrain loop, cabin loop) before removal — they must not be cross-connected on reassembly. Cap all open ports immediately.
   ⚠️The battery-loop port connects directly to the HV pack cooling plates. Coolant entering the pack body or HV connectors can damage the HV battery (~$15,000+) and create a shock/fire hazard.
   Torque spec

   Hose Clamps3 Nm (2 lb-ft)
6. 6

   Remove heat pump mounting hardware
   Support the heat pump assembly from below. Remove the manufacturer-specified mounting bolts securing the heat pump to its bracket/subframe. Note the location of any ground straps and isolation bushings.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)
7. 7

   Remove the heat pump assembly
   Carefully lower or lift out the heat pump, keeping it level to prevent residual coolant or refrigerant oil from spilling onto adjacent components. Transfer any reusable brackets or sensors to the replacement unit per the service manual.
   ⚠️Do not allow drained coolant to drip onto the HV battery enclosure, HV connectors, or any orange cabling during removal.
   Torque spec

   Bracket Bolts20 Nm (15 lb-ft)

   Sensor Bolts11 Nm (8 lb-ft)
8. 8

   Prepare the replacement heat pump
   Inspect the replacement assembly for shipping caps and damage. Lubricate new refrigerant O-rings with the manufacturer-specified refrigerant oil. Transfer any required sensors or brackets and torque to OEM specification — refer to Tesla Service Manual for any value not in the verified list.
   Torque spec

   Sensor Bolts11 Nm (8 lb-ft)
9. 9

   Install replacement heat pump
   Position the new heat pump and start mounting bolts by hand to avoid cross-threading the aluminum structure. Torque mounting hardware to spec. Reinstall any ground straps to original locations.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)

   Bracket Bolts20 Nm (15 lb-ft)
10. 10

    Reconnect coolant lines
    Reconnect each coolant line to its labeled port. Use new clamps/retainers where required. Verify quick-connects fully seat (audible click and pull-test). Torque threaded coolant fittings and clamps to spec.
    ⚠️A mis-routed or under-torqued battery-loop fitting can leak coolant onto the HV pack in service. Verify each connection visually and via Toolbox pressure test before returning the vehicle.
    Torque spec

    Coolant Line Fittings15 Nm (11 lb-ft)

    Hose Clamps3 Nm (2 lb-ft)
11. 11

    Reconnect refrigerant lines
    Install line blocks with new O-rings. Torque retaining bolts to OEM specification — refer to Tesla Service Manual (refrigerant block bolts are not in the verified torque list above; do not guess).
12. 12

    Reconnect low-voltage harnesses and reinstall covers
    Reconnect all LV connectors in their original locations, ensuring locking tabs latch fully. Reinstall any covers/shields removed for access and torque cover fasteners to spec.
    Torque spec

    Cover Screws11 Nm (8 lb-ft)

Reassembly

1. Reinstall front underbody shield(s) and aero panels, torquing fasteners to OEM specification.
2. Lower the vehicle off jack stands or lift; exit air-suspension Jack Mode.
3. Reconnect the 12V battery in the frunk (positive first, then negative); reinstall the cover and frunk liner.
4. Using Toolbox, perform a vacuum-fill of the coolant system with Tesla Battery/Motor Coolant (G-48 spec). Do NOT gravity-fill — air pockets in the battery loop will cause hot spots and damage.
5. Run the Toolbox coolant fill / bleed routine until target fill volume and pressures are achieved with no air detected.
6. Evacuate the refrigerant system to deep vacuum (≥30 minutes), verify vacuum hold, then charge with R-1234yf to the weight specified on the under-hood label, plus any compressor oil top-up per service manual.
7. Take the vehicle out of Service Mode in Toolbox and clear any thermal-system DTCs.

Verification

• With Toolbox connected, run the thermal system self-test: verify coolant pump speeds, valve positions (octovalve/equivalent), and refrigerant high/low side pressures fall within spec at idle and under load.
• Confirm cabin A/C output: vent temperature should drop below ambient within 1–2 minutes; heat-pump heating should produce warm air within a comparable time when commanded.
• Monitor battery and powertrain coolant temperatures during a 10–15 minute test drive — temperatures should stabilize without oscillation or warnings on the touchscreen.
• Inspect every disturbed coolant fitting and refrigerant block for leaks (visual + UV dye if available, or electronic refrigerant leak detector).
• Verify Falcon doors operate normally and obstruction sensors are calibrated after exiting Service Mode.
• Document service: per Tesla's current guidance, battery coolant should be inspected at 4 years / 50,000 mi — record this service date for the next inspection interval.

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