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Autopapyrus · Toyota Crown 2.5 Hybrid (2018)
https://autopapyrus.com/guides/toyota/crown/coolant-replacement/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Toyota Crown 2.5 Hybrid (2018): Coolant Replacement

The 2018 Crown, S220 generation, with the 2.5-liter hybrid has the A25A-FXS hybrid powertrain. This is the hybrid version of the same 2.5 L engine that is called A25A-FKS in the non-hybrid version. This car has two cooling circuits: the engine and the power electronics (inverter and power management control unit). Fill only with an organic hybrid-type coolant such as Toyota SLLC, and do not mix it with red or green antifreezes of other types. The approximate capacity of the engine circuit is about 6 L (6.3 qt), and the power electronics circuit is separate, about 1.8 L (1.9 qt). Check the exact capacities and the replacement interval against the manufacturer's maintenance schedule.

DifficultyMedium Time2-3 hours Steps12

Parts

4
№Part
01 Toyota Super Long Life Coolant (SLLC), pink, premixed 50/50, protection down to about -35 °C (-31 °F)
02 Toyota Super Long Life Coolant (SLLC) concentrate, pinkalternative to premixed; dilute with deionized water
03 Deionized waterfor diluting the concentrate
04 Drain plug sealing washersif the design uses them

Tools

8
  • jack and jack stands or a lift
  • wrench or socket for the radiator drain plug
  • flat-head screwdriver
  • drain pan of at least 10 L (10.6 qt)
  • funnel
  • gloves
  • rags
  • diagnostic scan tool with active test function (recommended for bleeding the hybrid system)

Step by step

12 steps
  1. Shut off the engine, put the vehicle in OFF mode, and let the system cool for at least one hour. Open the hood. The system is under pressure, so do not open the cap when the engine is hot.
  2. Park the vehicle on a level surface or a lift. If you are raising it with a jack, use jack stands. Remove the lower plastic cover that protects the radiator and the oil pan.
  3. Place the drain pan under the radiator. Open the reservoir cap and the radiator cap, if your vehicle has one, so the coolant can drain freely.
  4. Remove the drain plug at the bottom of the radiator, or disconnect the lower hose if there is no plug. Drain the coolant completely. If there is a drain plug on the engine block, drain through it as well.
  5. Drain the power electronics circuit separately if it has a drain fitting. If it does not, only the engine circuit coolant will be replaced, and a complete replacement will require shop equipment.
  6. Drain the coolant from the reservoir, remove it if necessary, and rinse out any sediment with clean water.
  7. Close all the drain points. Tighten the plugs carefully, without overtightening them in the aluminum threads. Check the exact tightening torque against the manufacturer's maintenance schedule.
  8. If you need to flush the system, fill it with deionized water, warm the system up, and drain it. Repeat until clean water comes out of the system. Do not use ordinary tap water, because it leaves scale.
  9. Prepare the coolant. If you have concentrate, dilute it with deionized water in the ratio specified on the container. Fill slowly through the radiator filler neck or through the reservoir to the FULL level.
  10. Turn the ignition to READY mode. On a hybrid, the engine does not start right away, so you need to make it run in order to bleed the system. To do this, you can use the active test function on the scan tool, or leave the vehicle in READY mode with the heater on maximum. Monitor the level in the reservoir and top it up.
  11. Once the engine has started and warmed up and the fan has shut off, let the vehicle cool down and check the level again. If the coolant has settled, top it up to the FULL mark. Turn the heater to maximum to make sure the heater blows hot air. If the air is cold, an air pocket remains in the system, and the bleeding must be repeated.
  12. Reinstall the cover. After a few days of driving, check the coolant level with the engine cold and inspect the connections for leaks.

Common mistakes and warnings

  • On a hybrid, the high-voltage components are located near the power electronics cooling circuit
  • Do not touch the orange high-voltage cables and connectors
  • If you are not confident in your abilities, take the vehicle to a repair shop
  • Coolant is toxic, so do not leave it in open containers, and dispose of it at a collection facility
  • Tightening torques are not given in this guide, so check the exact values for your vehicle against the manufacturer's maintenance schedule
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