The void the vacuum is creating is filled by coolant being drawn from a tube attached at the lowest point of the recovery reservoir and the level goes back to “cold full”. As the engine is cooling back down, a vacuum is created in the cooling system as the coolant returns to its ambient temperature. The tank is not under pressure and vents to outside air. When the system goes above normal pressure, with expanding coolant volume, like when the engine is at full operating temperature and is shut off, excess coolant by-passes the radiator cap and flows through a tube and empties into the top of the plastic recovery reservoir which can go to “full hot” level. The cooling system has a radiator, radiator cap, and all other coventional components. This system allows a small amount of coolant to be lost to evaporation. It Isn’t Designed To Lose Coolant, It Is Designed With A Pressure-Less Recovery Reservoir. Even some human body parts shrink a little around here in January. My first reaction is usually one of concern, but I have grown accustomed to it by now and realize what’s going on and sometimes I give them a little sip. This is just normal when our temperatures hit -20F to -30F (-30C to -35C} in the season. These vehicles have never had cooling system problems in hundreds of thousands of miles. It states, "If you have to add coolant more than four times a year, have your dealer check your cooling system."Īnother observation: Over the years I have noticed that the “closed” system cars do have their coolant level drop a little in the reservoir with the onset of winter temperatures every year just about the time I have to “plump up” the tyres. Of course all my cars have pressurized cooling systems, it’s just the recovery reservoirs I’m talking about.Īdditional FYI: I just checked one of my “open” system car’s Owner’s Manual. However, I expect my “open” system cars to lose some to evaporation. I expect my “closed” system cars to lose no coolant. My cars with an “open” recovery system just have plastic reservoir caps and the caps or the reservoirs (I have both styles) have large vents to the ambient air. The reservoirs on the “closed” recovery system cars have a raditor type cap on them. FYI: Some Cars Have A Closed Coolant Recovery System And Some Don’t.
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