Unless the engine is severely and continuously overheated coolant simply won't "evaporate". Rather there's a very small leak somewhere in the system. And likely it's leaking only when the engine is at operating temperature so the cooling system is under pressure.
My wife's '03 Chevy Impala would lose about 12 oz of coolant a month. But I couldn't find a visible leak. Finally after a couple years of adding coolant every couple months it began leaking enough to leave a few drops on the floor of the garage when parked. Turned out a plastic elbow for the heater supply hose connection at the water pump was slowly failing. But it only leaked when the engine was hot - the escaping coolant got blown away rather than dripping onto the floor. Replacing the elbow finally corrected the problem - no leaks since.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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