{"glb":"/models/components/cooling.glb","parts":[
  {"id":"eng-cool-001","node":"radiatorsLeftRight","label":"Radiators — front left and right (x2)","assembly":"Radiators","system":"Cooling","tier":"primary","partNumber":"991.106.131.03","function":"Side-mounted aluminum radiators in the front fascia dissipate engine heat by transferring it from coolant to ambient airflow.","componentId":"cooling"},
  {"id":"eng-cool-002","node":"radiatorFanModules","label":"Radiator fan modules (x2)","assembly":"Radiators","system":"Cooling","tier":"primary","partNumber":"991.624.939.02","function":"Electric fan modules draw air through each side radiator to maintain coolant temperature at low vehicle speeds or when stationary."},
  {"id":"eng-cool-003","node":"coolantThermostat","label":"Coolant thermostat (map-controlled)","assembly":"Water Pump & Thermostat","system":"Cooling","tier":"primary","partNumber":"9A1.106.226.03","function":"Electronically map-controlled thermostat regulates coolant flow to the radiators based on engine load and temperature targets rather than a fixed wax element."},
  {"id":"eng-cool-004","node":"waterPumpElectric","label":"Water pump (electric)","assembly":"Water Pump & Thermostat","system":"Cooling","tier":"primary","partNumber":"9A1.106.048.01","function":"Electric auxiliary water pump supplements the mechanical pump to ensure coolant circulation during hot-soak and after engine-off cool-down cycles."},
  {"id":"eng-cool-005","node":"mainWaterPump","label":"Main water pump (belt-driven or chain)","assembly":"Water Pump & Thermostat","system":"Cooling","tier":"primary","partNumber":"9A1.106.048.01","function":"Engine-driven primary water pump circulates coolant through the block, heads, and radiators to maintain operating temperature under all drive conditions."},
  {"id":"eng-cool-006","node":"coolantExpansionTank","label":"Coolant expansion tank","assembly":"Reservoir & Hoses","system":"Cooling","tier":"primary","partNumber":"981.106.147.04","function":"Translucent reservoir in the engine bay accommodates coolant volume changes with temperature and provides the system fill and bleed point."},
  {"id":"eng-cool-007","node":"coolantHoses","label":"Coolant hoses (upper and lower, x2 circuits)","assembly":"Reservoir & Hoses","system":"Cooling","tier":"primary","partNumber":"981.106.501.01","function":"Upper and lower coolant hoses route hot coolant from the engine to the radiators and return cooled coolant back to the water pump inlet."},
  {"id":"eng-cool-008","node":"engineOilCooler","label":"Engine oil cooler / heat exchanger","assembly":"Oil Cooling","system":"Cooling","tier":"primary","partNumber":"9A1.107.450.10","function":"Water-to-oil heat exchanger bolted to the block transfers excess heat from engine oil into the coolant circuit to maintain safe oil operating temperatures."},
  {"id":"eng-cool-009","node":"oilTemperatureSensor","label":"Oil temperature sensor","assembly":"Oil Cooling","system":"Cooling","tier":"primary","partNumber":"948.606.420.01","function":"NTC oil temperature sensor reports real-time oil temperature to the DME for fuel and ignition mapping adjustments and driver instrument display."},
  {"id":"cooling-system-new-001","node":"coolantPumpHousing","label":"Coolant pump housing","assembly":"Water Pump & Thermostat","system":"Cooling","tier":"sub","partNumber":"9A1.106.039.01","function":"Cast housing that encloses the coolant pump impeller and routes pressurized coolant flow into the engine block passages."},
  {"id":"cooling-system-new-002","node":"waterGuideHousing","label":"Water guide housing","assembly":"Water Pump & Thermostat","system":"Cooling","tier":"sub","partNumber":"9A1.106.022.01","function":"Internal engine casting that directs coolant flow from the pump outlet through defined passages in the block to ensure even cylinder cooling."},
  {"id":"cooling-system-new-003","node":"coolantTemperatureSensor","label":"Coolant temperature sensor (engine)","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"948.606.420.00","function":"NTC sensor mounted in the engine coolant circuit reports coolant temperature to the DME for closed-loop cooling control and dashboard gauge display."},
  {"id":"cooling-system-new-004","node":"waterLevelSender","label":"Water level sender (coolant reservoir)","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"970.606.503.00","function":"Float-type sender in the expansion tank triggers a low-coolant warning on the instrument cluster when the coolant level drops below the minimum mark."},
  {"id":"cooling-system-new-005","node":"radiatorAirGuideLeft","label":"Radiator air guide (left and right)","assembly":"Radiators","system":"Cooling","tier":"sub","partNumber":"991.106.341.00","function":"Plastic air-guide panels channel airflow through the front radiator cores and prevent recirculation of hot air around the radiator sides."},
  {"id":"cooling-system-new-006","node":"coolantPipes","label":"Coolant pipes (crossover tubes)","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"981.106.651.02","function":"Rigid aluminium crossover pipes connect the left and right coolant circuits between the engine and front radiators, spanning the engine bay."},
  {"id":"cooling-system-new-007","node":"coolantPumpPulley","label":"Coolant pump pulley","assembly":"Water Pump & Thermostat","system":"Cooling","tier":"sub","partNumber":"9A1.106.248.00","function":"Belt-driven pulley pressed onto the coolant pump shaft that transfers rotational drive from the accessory belt to spin the pump impeller."},
  {"id":"cooling-system-new-008","node":"thermostatSeal","label":"Thermostat housing seal / O-ring","assembly":"Water Pump & Thermostat","system":"Cooling","tier":"sub","partNumber":"9A1.106.217.00","function":"Elastomeric seal between the thermostat and its housing prevents coolant leaks at the junction under operating pressure and temperature cycling."},
  {"id":"cooling-system-new-009","node":"coolantReservoirCap","label":"Coolant reservoir pressure cap","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"996.106.447.04","function":"Pressure-relief cap on the expansion tank maintains system pressure at the specified bar rating and releases excess pressure to prevent hose damage."},
  {"id":"cooling-system-new-010","node":"radiatorFanSecondary","label":"Radiator fan (secondary / centre radiator)","assembly":"Radiators","system":"Cooling","tier":"sub","partNumber":"991.106.137.02","function":"Centre auxiliary radiator mounted between the two main side radiators provides supplemental cooling capacity at high ambient temperatures or track use."},
  {"id":"eng-cool-010","node":"upperRadiatorHose","label":"Upper radiator hose","assembly":"Reservoir & Hoses","system":"Cooling","tier":"primary","partNumber":"991.106.621.02","function":"Carries hot coolant from the engine outlet to the top of the radiator; the primary high-pressure leg of the main cooling circuit."},
  {"id":"eng-cool-011","node":"lowerRadiatorHose","label":"Lower radiator hose","assembly":"Reservoir & Hoses","system":"Cooling","tier":"primary","partNumber":"991.106.622.02","function":"Returns cooled coolant from the radiator bottom tank back to the water pump inlet; the low-pressure return leg of the main cooling circuit."},
  {"id":"eng-cool-012","node":"heaterHoseSupply","label":"Heater hose — supply (engine to heater core)","assembly":"Reservoir & Hoses","system":"Cooling","tier":"primary","partNumber":"981.106.813.00","function":"Flexible hose that routes hot coolant from the engine to the cabin heater core to provide interior heating."},
  {"id":"eng-cool-013","node":"heaterHoseReturn","label":"Heater hose — return (heater core to engine)","assembly":"Reservoir & Hoses","system":"Cooling","tier":"primary","partNumber":"981.106.814.01","function":"Returns cooled coolant from the heater core back to the engine inlet completing the cabin heating sub-circuit."},
  {"id":"eng-cool-014","node":"heaterPipeline","label":"Heater pipeline (HVAC coolant line)","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"981.572.181.01","function":"Rigid coolant pipeline routed through the cabin/front structure connecting the HVAC heater circuit to the main engine cooling loop.","parent":"eng-cool-012"},
  {"id":"eng-cool-015","node":"crossoverPipeLeft","label":"Crossover pipe — left circuit","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"991.106.711.02","function":"Cross tube bridging the left-side coolant circuit between the engine and front radiator; maintains balanced flow in the split cooling layout."},
  {"id":"eng-cool-016","node":"crossoverPipeRight","label":"Crossover pipe — right circuit","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"991.106.720.02","function":"Cross tube bridging the right-side coolant circuit between the engine and front radiator; mirrors the left crossover for symmetrical flow distribution."},
  {"id":"eng-cool-017","node":"expansionTankFeedHose","label":"Expansion tank feed hose","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"981.106.267.02","function":"Connects the pressurized cooling circuit to the expansion tank, allowing coolant to flow into the reservoir as temperature and pressure rise.","parent":"eng-cool-006"},
  {"id":"eng-cool-018","node":"coolantOverflowHose","label":"Coolant overflow hose","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"981.106.288.01","function":"Routes excess coolant vented from the reservoir pressure cap back into the system or to a safe drain path, preventing spillage on hot components.","parent":"eng-cool-006"},
  {"id":"eng-cool-019","node":"distributerTubeLeft","label":"Coolant distributor tube — left","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"991.106.751.03","function":"Internal distribution tube directing coolant to multiple outlets on the left cylinder bank for balanced jacket cooling."},
  {"id":"eng-cool-020","node":"distributerTubeRight","label":"Coolant distributor tube — right","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"991.106.752.03","function":"Internal distribution tube directing coolant to multiple outlets on the right cylinder bank for balanced jacket cooling."},
  {"id":"eng-cool-021","node":"coolantBleederScrew","label":"Coolant bleeder screw","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"999.926.030.01","function":"Bleed screw at the high points of the cooling circuit allows trapped air to be purged during fill and top-up procedures to prevent air-lock."},
  {"id":"eng-cool-022","node":"coolantTempSensorRadiatorOutlet","label":"Coolant temperature sensor — radiator outlet","assembly":"Radiators","system":"Cooling","tier":"sub","partNumber":"948.606.420.01","function":"Second NTC temperature sensor positioned at the radiator outlet monitors coolant temperature returning from the radiators; used by the DME and electric fan control logic."},
  {"id":"eng-cool-023","node":"coolantDrainPlug","label":"Coolant drain plug / sealing plug","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"900.219.018.30","function":"Block-mounted sealing plug opened during coolant service to gravity-drain the engine block passages; re-sealed with a new washer to prevent weeping."},
  {"id":"eng-cool-024","node":"radiatorFanLeft","label":"Radiator fan — left (electric)","assembly":"Radiators","system":"Cooling","tier":"primary","partNumber":"991.624.939.01","function":"Left-side electric pusher/puller fan mounts behind the left front radiator and activates based on coolant temperature or AC compressor demand."},
  {"id":"eng-cool-025","node":"fanControlModule","label":"Fan control module (radiator fan relay/controller)","assembly":"Radiators","system":"Cooling","tier":"sub","partNumber":"991.624.935.01","function":"Electronic module receives DME and AC signals to regulate electric radiator fan speed via PWM or relay switching, enabling variable-speed cooling management.","parent":"eng-cool-002"},
  {"id":"eng-cool-026","node":"breatherLine","label":"Coolant breather / vent line","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"981.106.682.02","function":"Small-bore flexible line that vents air from high points in the cooling circuit to the expansion tank, maintaining a full liquid-filled system."},
  {"id":"eng-cool-027","node":"waterPipeInternal","label":"Internal coolant water pipe (block)","assembly":"Water Pump & Thermostat","system":"Cooling","tier":"sub","partNumber":"9A1.106.026.30","function":"Cast or pressed water pipe inside the engine block routing coolant from the pump outlet into the internal galleries for cylinder and head cooling.","parent":"eng-cool-005"},
  {"id":"eng-cool-028","node":"acCondenserAirGuide","label":"AC condenser air guide / cooling interaction","assembly":"Radiators","system":"Cooling","tier":"sub","partNumber":"981.575.321.00","function":"Air-guide duct ahead of the AC condenser ensures ram air flows through the condenser before reaching the engine radiator; condenser heat rejected here is additive to the total frontal heat-rejection load shared with the engine cooling fan circuit."},
  {"id":"eng-cool-029","node":"pDKFluidCooler","label":"PDK fluid cooler (transmission oil cooler)","assembly":"Oil Cooling","system":"Cooling","tier":"primary","partNumber":"981.307.023.00","function":"Heat exchanger for PDK dual-clutch transmission fluid, mounted in the cooling circuit on PDK-equipped 981 variants; uses engine coolant as the heat-sink medium to warm transmission fluid from cold and cap peak temperatures."},
  {"id":"eng-cool-030","node":"coolantWaterHoseReservoir","label":"Water hose — reservoir circuit","assembly":"Reservoir & Hoses","system":"Cooling","tier":"sub","partNumber":"981.106.270.00","function":"Short connecting hose between the expansion tank and the main coolant circuit neck, completing the pressurized reservoir loop.","parent":"eng-cool-006"}
]}