Q: Q: Losing coolant

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Hi there..i know it's a 30 year old car...i just can't confirm what's wrong...i've just filled my coolant reservoir to the right level, drove the car (with the temp gauge needle a bit above middle) then parked it. Next day, coolant is a bit lower than its right level..If it's a leak, is there a test to find it easily?....Ambient temperatures reached 37 degrees c in my town and moisture up to 90% ...could it be that water in the coolant mix evaporated due to abnormal temps outside..Nowadays, i'm always refilling the coolant before driving the car...Last thing i thought of: Thermostat....maybe not fully opening,,thank you

My car has 154000 miles.
My car has an automatic transmission.

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