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 - Two-Brush Generators - by Chris Pratt. Whether for product liability or because the aftermarket parts and labor business is lucrative, this concept is disturbingly prevalent. Fortunately when you step into your shop and make that jump 50 years back in time to work with your old tractor, this concept goes out the window. Even so, when it comes to the charging system, people quickly revert to this idea and start replacing the major components one at a time until it works. The reason you don't find any decals in your replacement set wit
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