Aston177

Wow that was a fast reply. So the bubbles are normal? From what I've heard, if the coolant level is higher than the "Full" mark, the engine is dumping hot water into the tank, correct? I might be wrong...

RIWWP

iTrader: (2)

If the level is higher than the full mark, either it is overfilled or there is some air somewhere else in the system, and that air's expansion is pushing up on the coolant in the tank.

Turn the heat on to full heat, full blast, stop the car on a slope with the nose up, and rev it up to ~5,000rpm gently a few times. It should move the air around and over to the tank where it's supposed to be.

Aston177

Did you check the picture? It's in the tank. I will try doing what you said. How steep should this slope be? And is this something I should worry about? Do you think I should flush it and put new coolant in? Because I think the previous owner had never changed it

RIWWP

iTrader: (2)

There will always be air in the tank. That's what it's for It's an expansion tank specifically to get all air in the system to the tank, and the air can expand (As it heats up) there without affecting the rest of the system.

Doesn't have to be a steep slope. Just picture the entire coolant system, with it's hoses, the engine, the heater core, the radiator, etc... You are tilting it around to try to get air to go to the highest part of the system. The coolant tank is already at the highest part of the system, but not by all that much. The more you can angle the car back, the easier time air will have of getting pushed back to the tank.

If you haven't changed the coolant in the past 2 years for normal coolant, 5 years for Mazda FL-22 (The factory stuff), then yes, replacing the coolant would be a good thing.

Aston177

Ok wow that makes perfect sense. I'll do that.

So the coolant level above the "Full" mark is not something I should worry about, right?

No I haven't changed the coolant. I've only had the car for 3 weeks. Would any engine coolant work? Or should I get MAZDA FL-22?

And then engine components trying to burn my hands is normal? :P

RIWWP

iTrader: (2)

Yes, stuff gets REALLY hot under the hood, hot enough to leave burns. That's normal. It's a hot little engine.

Mazda's FL-22 is the most recommended coolant for a variety of reasons. One of the cases where the OEM fluid is actually the best for a street driven car.

Aston177

Thank you so much. I'll get the OEM coolant

Aston177

I pulled into a parking lot and started revving my car to see if it'll spit flames. RIWWP you were right. It stopped revving after about a minute. It's clearly a safety feature like you said. Anyways, after like 3 minutes of continuous revving, my car eventually started to spit flames. They were super small. But I guess that's coz my car wasn't warmed up completely thanks for all the help everyone