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Today I got the message the coolant level is low, checked when cold, it was below the minimum. I made the mistake of partially opening the coolant cap while engine temp was halfway to its operating temp. I heard a sound of pressurized air (sucked in or pumped out) so I closed it back.
Now I can hear sound of liquid moving (air bubble?) every 3-5 seconds, but only while the ventilation is turned on.
What should I do? Thank you.
Your coolant system may be a bit low, but shouldn't be an issue. Just pop the top when the engine is cold and fill until it gets to the desired height. If it's a bit low, there may be air in the system causing the noise. Your system, having a recovery tank (versus an overflow) circulates coolant through it while running, which means the cooling system is self bleeding. Just fill the coolant up and run it like normal. Double check it the next day to ensure it's still good.
As an aside, there may be a reason your coolant is a bit low. You'll want to keep your eye on the levels and if it gets low again, consider taking it to a mechanic and let them know you are losing coolant. There may be a slow leak, which could exhibit itself on your garage floor or through the smell of antifreeze when running. Pay attention to the levels for the next while to be sure.
