Replacement of the heat pump assembly on a 2024 Tesla Model X Long Range. This is a PROFESSIONAL-ONLY procedure that interfaces with the integrated battery/motor/cabin thermal loop and requires Tesla Toolbox software to safely depressurize and refill. Coolant inspection interval is 4 years / 50,000 mi per current Tesla guidance.

Warnings

Tools required

Parts

• Heat pump assembly (Model X 2024 spec) × 1 — Tesla OEM heat pump — refer to current parts catalog
• Refrigerant line O-rings / seal kit × 1 — OEM refrigerant seal kit for heat pump replacement
• Coolant hose clamps (single-use) × 4 — OEM spring/constant-tension clamps as fitted
• Coolant line quick-connect retainers × 2 — OEM retainer clips as fitted

Fluids

• Tesla Battery/Motor Coolant (G-48) — 10 qt
• R-1234yf refrigerant (per system charge label)
• PAG/POE refrigerant oil (per heat pump spec)

Preparation

1. Park on level ground, place in P, engage parking brake.
2. Exit ALL doors with the 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 per Tesla procedure (remove frunk liner, 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 the appropriate Service Mode for thermal system work. Use Toolbox to depressurize and isolate the battery cooling loop before any line is opened.
7. Disable the Falcon doors via Toolbox (or physically secure them closed) so they cannot actuate while you are working under the vehicle.
8. Recover refrigerant from the A/C system using an R-1234yf-compatible recovery machine until system pressure reaches the recovery machine's specified endpoint.
9. Raise the vehicle on a lift rated for Model X curb weight, supporting at the manufacturer-specified lift points.
10. Have catch pans positioned — coolant capacity of the loop is approximately 10 quarts and significant volume will drain when lines are opened.

Procedure

1. 1

   Confirm system depressurization via Toolbox
   With Toolbox connected, verify that both the refrigerant circuit has been recovered and the battery/powertrain coolant loop has been commanded to a depressurized state. Confirm pump operation is disabled and valve positions are as required by Toolbox before opening any line.
   ⚠️Do not proceed if Toolbox does not confirm a safe state. Opening a pressurized loop can spray hot coolant onto HV components and cause battery damage or personal injury.
2. 2

   Remove frunk tub and access cover
   Remove the frunk storage liner and any underlying acoustic/access covers needed to expose the heat pump assembly mounted in the front module area. Set fasteners aside and label by location.
   Torque spec

   Cover Screws11 Nm (8 lb-ft)
3. 3

   Document and label connections
   Photograph and label every coolant hose, refrigerant line, and electrical connector at the heat pump. The Model X heat pump has multiple similar-diameter coolant ports that route to different circuits (battery, powertrain, cabin). Mis-routing on reassembly will cause thermal faults or overheating.
4. 4

   Disconnect electrical connectors
   Release locking tabs and disconnect the low-voltage harness connectors from the heat pump assembly. Inspect for any signs of moisture or corrosion that would indicate prior coolant leakage.
   ⚠If any connector shows green/white corrosion or wet residue, suspect a coolant leak — do not energize the system until the source is identified.
5. 5

   Disconnect refrigerant lines
   Using the manufacturer-specified disconnect tool, release the refrigerant line fittings at the heat pump. Cap all openings immediately to prevent moisture ingress. Discard old O-rings; they are single-use.
   ⚠️Verify refrigerant has been fully recovered before loosening fittings. Residual R-1234yf can discharge violently and is mildly flammable.
6. 6

   Disconnect coolant lines
   Place catch pans under the vehicle. Release each coolant hose clamp or quick-connect at the heat pump in the order recommended by the service procedure to control drain direction. Allow the loop to drain into the catch pan. Cap all open ports on the vehicle side.
   ⚠️These coolant lines are part of the integrated thermal loop shared with the HV battery. Improper handling can allow coolant to contact HV components and may damage the HV battery (~$15,000+ to replace). Keep all coolant clear of orange cabling and HV connectors.
   Torque spec

   Hose Clamps3 Nm (2 lb-ft)

   Coolant Line Fittings15 Nm (11 lb-ft)
7. 7

   Remove heat pump mounting hardware
   Support the heat pump assembly. Remove the mounting bolts and any bracket fasteners securing it to the front structure. Lower the unit carefully — it will retain residual coolant and refrigerant oil.
   ⚠Aluminum mounting structure — do not pry against thin-wall castings.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)

   Bracket Bolts20 Nm (15 lb-ft)
8. 8

   Transfer sensors and brackets if required
   If the replacement heat pump is supplied without sensors or brackets, transfer them from the original unit. Use new seals at any sensor port. Inspect sensor wiring for chafing.
   Torque spec

   Sensor Bolts11 Nm (8 lb-ft)

   Bracket Bolts20 Nm (15 lb-ft)
9. 9

   Install new heat pump assembly
   Position the new heat pump assembly into the mounting location and install fasteners finger-tight. Verify alignment with all hose and refrigerant ports before final torque.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)

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

    Reconnect coolant lines with new clamps/seals
    Reconnect each coolant line to its labeled port. Use new clamps or retainer clips as required. Confirm full seating of quick-connects (audible click and pull-test).
    ⚠️A misrouted or improperly seated coolant line can leak coolant onto HV components, damaging the battery pack and creating a shock/fire hazard. Verify routing against your earlier photos.
    Torque spec

    Hose Clamps3 Nm (2 lb-ft)

    Coolant Line Fittings15 Nm (11 lb-ft)
11. 11

    Reconnect refrigerant lines with new O-rings
    Lubricate new O-rings with the refrigerant oil specified for this system. Install and torque refrigerant line fittings to OEM specification — refer to Tesla Service Manual for the specific torque on each refrigerant fitting.
12. 12

    Reconnect electrical connectors
    Reconnect all low-voltage connectors to the heat pump, ensuring locking tabs fully engage. Route harness clear of any hot or moving components.

Reassembly

1. Reinstall any access covers and the frunk tub, torquing cover screws to spec.
2. Reconnect the 12V battery (positive first, then negative).
3. Vacuum-fill the coolant loop using a coolant vacuum fill tool with Tesla Battery/Motor Coolant (G-48). Approximate system capacity is 10 quarts; final fill is dictated by the deaeration procedure in Toolbox.
4. With Toolbox, run the coolant fill/bleed routine for the integrated thermal loop. This sequences the valves and pumps to purge air from the battery, powertrain, and cabin circuits.
5. Evacuate the refrigerant system to deep vacuum (per machine spec) and confirm vacuum hold before charging.
6. Charge the A/C system with R-1234yf to the weight specified on the under-hood label.
7. Re-enable Falcon doors via Toolbox and exit Service Mode.

Verification

• Clear any DTCs in Toolbox and confirm no thermal-system faults return after a key cycle.
• Run the Toolbox thermal self-test: verify battery loop, powertrain loop, and cabin loop all reach commanded temperatures with no pump cavitation or pressure faults.
• Verify A/C performance — center vent outlet temperature within OEM spec at idle with set point at LO and blower on high.
• Verify heat-pump heating mode — cabin reaches set temperature in a reasonable time at ambient < 10 °C.
• Inspect all coolant and refrigerant connections for leaks after a 15-minute run; pressure-test or UV dye check if any wet area is found.
• Confirm coolant reservoir level is at the correct mark after the bleed routine — recheck after the next drive cycle.
• Cycle Falcon doors to confirm normal operation after re-enable.
• Document service: per current Tesla guidance, battery coolant should be inspected again at 4 years / 50,000 mi.

More procedures for this vehicle