Heat Pump System

Heat pump replacement on the 2024 Cybertruck Dual Motor. This is a PROFESSIONAL-ONLY procedure that interacts with the integrated 800V battery thermal loop and requires Tesla Toolbox software for safe depressurization, refill, and air purge. Battery coolant inspection is recommended at 4 years / 50,000 mi per Tesla guidance.

Warnings

Tools required

Parts

• Cybertruck heat pump assembly (manufacturer-specified) × 1 — Tesla OEM Cybertruck heat pump — refer to Service Manual for current part number
• Coolant line O-rings / quick-connect seals × 1 — OEM seals matched to heat pump fittings — replace any disturbed
• Refrigerant line sealing washers/O-rings × 1 — OEM R-1234yf line seals
• Heat pump mounting hardware (if not reusable) × 1 — Per Tesla Service Manual

Fluids

• Tesla Battery/Motor Coolant (G-48) — 10 qt
• R-1234yf refrigerant (charge per Tesla service label)
• PAG/POE refrigerant oil (per Tesla specification for this compressor)

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 48V low-voltage battery per Tesla Service Manual procedure (location and disconnect sequence differ from 12V Teslas — refer to Cybertruck-specific instructions).
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. Run the battery coolant loop depressurization routine and confirm system is at safe pressure before opening any line.
7. Recover refrigerant from the A/C system using a recovery machine rated for R-1234yf. Record the recovered weight.
8. Raise vehicle on a lift rated for Cybertruck weight. Use Tesla-specified lift points only — air suspension hardware and the exoskeleton structure require correct point selection.
9. Remove the front underbody/aero shield(s) as required to access the heat pump assembly per the Service Manual.

Procedure

1. 1

   Verify thermal loop is depressurized
   With Toolbox still connected, confirm via the thermal system diagnostic page that the battery cooling loop and cabin loop are depressurized and that the octovalve / refrigerant valves are in service position. Do not proceed if any pressure or temperature reading is out of expected service range.
   ⚠️Opening a pressurized battery cooling loop can spray hot coolant onto HV components. Damage to the HV battery from coolant intrusion can exceed $15,000 to repair.
2. 2

   Drain battery/cabin coolant
   Locate the coolant drain point(s) per the Service Manual. Place a clean catch pan rated for the full 10 qt capacity. Open the drain and allow coolant to fully evacuate. Inspect drained coolant for color, debris, or oil contamination — note findings as part of the 4-year/50,000-mi coolant inspection.
   ⚠️Coolant contacting HV connectors or busbars can short the 800V system. Keep the catch pan positioned to prevent splash onto adjacent HV-orange components. Improper handling can damage the HV battery (~$15,000+).
3. 3

   Disconnect low-voltage harnesses at the heat pump
   Identify and release the low-voltage signal connectors at the heat pump assembly (sensors, valve actuators, compressor control). Note the 48V architecture — connector locking styles may differ from earlier Teslas. Photograph routing before disconnecting to ease reassembly.
   ⚠Do not pry on connector bodies — use the integrated release tabs. Broken connectors are not individually serviced.
   Torque spec

   Connector Bolts7 Nm (5 lb-ft)
4. 4

   Disconnect refrigerant lines
   After confirming refrigerant has been recovered to <0 psi, remove the refrigerant line block fittings at the heat pump. Cap all open ports immediately to prevent moisture ingress. Replace all sealing O-rings — do not reuse.
   ⚠️Residual refrigerant can cause frostbite. Confirm full recovery before opening lines. Moisture ingress into the refrigerant loop will damage the compressor and desiccant.
5. 5

   Disconnect coolant lines from heat pump
   Release the coolant quick-connects / threaded fittings at the heat pump inlets and outlets. Have rags staged to capture residual coolant. Cap all open ports to prevent contamination of the loop.
   ⚠️Coolant lines on this assembly are part of the integrated battery thermal loop. Any contamination or air ingress can compromise battery cooling and damage the HV battery (~$15,000+ replacement). Treat every fitting as HV-adjacent.
   Torque spec

   Coolant Line Fittings15 Nm (11 lb-ft)

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

   Remove heat pump mounting hardware
   Support the heat pump assembly with a transmission jack or assistant. Remove the bracket bolts and primary mounting bolts securing the assembly to the front structure. Lower the assembly carefully — it is heavy and awkward.
   ⚠Do not let the assembly hang by any remaining line or harness. Damaging the octovalve or integrated valve block can require additional thermal loop service.
   Torque spec

   Bracket Bolts20 Nm (15 lb-ft)

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

   Transfer sensors and serviceable components
   If the replacement heat pump does not include sensors, transfer pressure/temperature sensors and any reusable brackets to the new unit. Use new O-rings on any sensor that seats against a fluid passage.
   Torque spec

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

   Install new heat pump assembly
   Lift the new heat pump into position. Start all mounting bolts by hand to avoid cross-threading the aluminum housing. Torque the mounting hardware to specification.
   Torque spec

   Mounting Bolts27 Nm (20 lb-ft)

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

   Reconnect coolant lines
   Install new O-rings, lubricate lightly with clean Tesla-spec coolant, and seat each fitting fully. Torque threaded coolant fittings and any retaining hose clamps to specification. Verify quick-connects audibly click and cannot be pulled apart.
   ⚠️An improperly seated coolant fitting can leak onto the HV battery during operation. Coolant intrusion can destroy the pack (~$15,000+) and may cause an HV fault or fire. Verify every fitting twice.
   Torque spec

   Coolant Line Fittings15 Nm (11 lb-ft)

   Hose Clamps3 Nm (2 lb-ft)
10. 10

    Reconnect refrigerant lines
    Install new refrigerant O-rings lubricated with the correct refrigerant oil. Torque the line block bolts to OEM specification — refer to Tesla Service Manual (refrigerant line torque is not on the verified list).
11. 11

    Reconnect low-voltage harnesses and any covers
    Reseat all signal connectors until they lock. Reinstall any service covers or shields removed for access. Torque connector retaining bolts and cover screws to specification.
    Torque spec

    Connector Bolts7 Nm (5 lb-ft)

    Cover Screws11 Nm (8 lb-ft)

Reassembly

1. Reinstall front underbody / aero shields with original fasteners.
2. Reconnect the 48V low-voltage battery per Tesla Service Manual sequence.
3. Using Tesla Toolbox, perform a vacuum fill of the coolant loop with Tesla Battery/Motor Coolant (G-48), approximately 10 qt total system capacity. Run the Toolbox-guided air purge / coolant bleed routine until the system reports complete.
4. Evacuate the refrigerant system with a vacuum pump for the duration specified by Tesla, then charge with R-1234yf to the weight specified on the under-hood / service label. Add refrigerant oil per Tesla specification if the compressor was replaced as part of the assembly.
5. Exit Service Mode in Toolbox and clear any stored thermal-system DTCs.

Verification

• With Toolbox connected, run the heat pump / thermal system self-test. Confirm no active DTCs and that all valve actuators move through their full range.
• Monitor refrigerant high/low side pressures during a full A/C performance test (cabin cooling) and during a battery preconditioning cycle (battery heating/cooling).
• Visually inspect every disturbed coolant and refrigerant fitting for leaks after a 15-minute run cycle. Recheck coolant level at the reservoir after the system has cycled and cooled.
• Test cabin heat, cabin A/C, and Supercharger preconditioning (drive to nearest Supercharger or trigger via navigation) to confirm the heat pump engages in all modes.
• Document the service date and mileage. Battery coolant should be inspected again per Tesla's 4-year / 50,000-mi recommendation.

More procedures for this vehicle