Battery cooling system service on the 2024 Cybertruck — drain, flush, and refill the low-voltage/auxiliary cooling loop with Tesla-spec G-48 coolant. This procedure covers ONLY the accessible coolant reservoir, hoses, and bleed routine; it does NOT cover the HV battery thermal loop, octovalve, heat pump, or any orange-cabled HV components.

Warnings

Tools required

Parts

• Coolant reservoir cap (inspect; replace if seal degraded) × 1 — OEM Cybertruck coolant reservoir cap
• Hose clamps (replace any single-use crimp clamps disturbed during service) × 2 — OEM-equivalent constant-tension clamp
• O-rings / quick-connect seals for any disturbed coolant fittings × 1 — OEM coolant line seal kit

Fluids

• Tesla Battery/Motor Coolant (G-48 specification) — 10 qt

Preparation

1. Park on level ground, place in P, engage the 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 Cybertruck service procedure (NOT a standard 12V — connector and disconnect sequence differ from S/3/X/Y).
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. Allow the vehicle to cool for a minimum of 2 hours after driving — the coolant loop is pressurized and hot coolant will scald.
7. Place the vehicle in Transport/Service mode via the touchscreen if accessible, to minimize 48V wake events during the procedure.
8. Raise the vehicle on a lift rated for Cybertruck curb weight using the manufacturer-specified lift points only.
9. Remove the front underbody/aero shield using the appropriate fasteners to access the coolant reservoir and lines.

Procedure

1. 1

   Inspect cooling system condition
   Visually inspect the coolant reservoir level and color. Healthy G-48 is pink/red and translucent. Brown, cloudy, or sediment-laden coolant indicates contamination. Check all accessible hoses and quick-connects for seepage, swelling, or chafing. Photograph hose routing before disturbing anything — Cybertruck coolant routing differs from other Tesla platforms.
   ⚠Do not open the reservoir cap while the system is warm — pressurized coolant release hazard.
2. 2

   Relieve system pressure
   With the system fully cool, slowly rotate the coolant reservoir cap to the first detent to vent pressure, then remove fully. Inspect the cap seal — replace if cracked or compressed.
3. 3

   Position drain pan and identify low-point drain
   Place a clean drain pan (12 qt minimum) under the manufacturer-specified low-point of the accessible coolant loop. The Cybertruck does not use a traditional radiator petcock — drainage is performed by disconnecting the lowest accessible coolant hose at the manufacturer-specified location. Confirm the line you are disconnecting is part of the auxiliary/low-voltage cooling loop, NOT the HV battery thermal loop.
   ⚠️If the line traces to the HV battery pack, octovalve, or any orange-cable component — STOP. That loop requires Tesla Toolbox and is out of scope.
4. 4

   Drain the accessible coolant loop
   Disconnect the manufacturer-specified hose using hose clamp pliers (or release the quick-connect per OEM procedure) and allow the loop to drain fully into the pan. Note the volume captured — compare to the 10 qt system capacity to gauge whether full evacuation was achieved. Residual coolant in HV-adjacent sections will only release during the powered bleed routine.
5. 5

   Inspect and replace hoses/clamps as needed
   With the loop drained, inspect each accessible hose for internal collapse, external cracking, or oil contamination. Replace any single-use crimp clamps that were disturbed. Do not reuse compromised quick-connect seals.
6. 6

   Reconnect coolant lines
   Reconnect all disturbed coolant fittings, ensuring quick-connects fully click into the locked position and any threaded fittings are seated squarely before torquing.
   Torque spec

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

   Vacuum-fill the cooling system
   Attach an Airlift-style vacuum fill tool to the coolant reservoir. Pull a vacuum to the tool manufacturer's specification and verify it holds for at least 30 seconds — any decay indicates a leak that must be corrected before refilling. With vacuum held, draw fresh Tesla-spec G-48 coolant into the system. Vacuum filling is strongly preferred on Cybertruck due to complex routing and air-trap geometry.
   ⚠Use only Tesla Battery/Motor Coolant (G-48). Do not substitute generic HOAT or universal coolants.
8. 8

   Top off reservoir to cold-fill mark
   After vacuum fill, top the reservoir to the manufacturer-specified COLD level mark. Do not overfill — expansion volume is required.
9. 9

   Run the OEM coolant bleed/service routine
   Reconnect the 48V low-voltage battery. Using an OEM-approved scan tool, initiate the coolant pump bleed/service routine specific to the Cybertruck. This cycles the electric coolant pump(s) to purge trapped air. Monitor the reservoir and add coolant as the level drops. Do NOT skip this step — passive bleeding is unreliable on this platform.
   ⚠If the scan tool reports thermal-loop diagnostic codes referencing the HV battery or heat pump, STOP and refer the vehicle to a Tesla-certified technician.
10. 10

    Final level check and cap installation
    After the bleed routine completes and the level stabilizes, top off to the COLD mark a final time. Inspect the cap seal, then install and rotate to the locked position.
11. 11

    Leak check
    Visually inspect every disturbed fitting and hose for weeping. Check the floor under the vehicle after a 10-minute soak. Any visible leak must be corrected before release.

Reassembly

1. Reinstall the front underbody/aero shield, torquing fasteners to OEM specification — refer to Tesla Service Manual.
2. Verify the 48V low-voltage battery is reconnected and secured.
3. Lower the vehicle to the ground.
4. Clear any informational diagnostic codes generated during service using the OEM scan tool.
5. Dispose of used coolant per local hazardous-waste regulations — G-48 is toxic to animals.

Verification

• Power the vehicle on and confirm no thermal-system warnings appear on the touchscreen.
• Allow the vehicle to reach normal operating temperature, then recheck reservoir level — top off cold the next morning if needed.
• Drive a short heat-soak loop (15–20 minutes), park, and re-inspect for leaks at all disturbed joints.
• Confirm cabin HVAC and battery preconditioning behave normally — abnormal pump noise or slow warm-up may indicate residual air in the loop.
• Record service date and mileage. Tesla's current guidance recommends battery coolant inspection at 4 years / 50,000 mi — log next inspection accordingly.
• If any HV thermal codes, octovalve codes, or heat-pump codes are present after service, the vehicle requires Tesla Toolbox diagnosis — do NOT release to customer.

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