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New here. I use to be a 240sx owner and I'm interesest in the BRZ/FR-S. Just curious about reliability.
After reading about the coolant issues I might have some insight. If the overfill is always showing low coolant. I don't believe adding coolant to the overfill fixes the problem. Someone mentioned bad bleeding from the factory. If that's the case I'm pretty sure the closed system is burning off coolant because it has air in it. I assume sometimes they stabilize themselves but in my case they just keep taking coolant from the overfill.
I have NEVER worked on a BRZ so I'm not saying this is apple to apples. But I had a similar issue with a 240 when I had to drain coolant to put on a new timing chain. You need to fill it at the radiator. When the car is cold you open the cap. If it's low you add fluid to the radiator. With the cap removed I would start the car and let it start to warm up. You should start to get bubbles and the fluid rises as it warms up. I used a funnel fitted perfectly to the radiator so the rising fluid would just push into the funnel and not all over the the car and floor. When the car warms up the thermostat would pop and the fluid would drain back into the motor. I would top off the radiator and sometimes it took a lot of fluid to get it back up. I would let a few more bubbles rise out for a minute or so and cap it. No more air in the system.
Once again not sure how the BRZ coolant system works but for most cars the principles are all the same. Just hoping this might help.
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