![]() And if there is an external leak, we'll see it on the floor the next morning. Then we'll turn off the engine and let the car sit overnight with the cooling system still pressurized at about 15 psi. Then we'll pressurize the cooling system with the cooling system tester, and run the engine until it's good and hot. What we do is we'll park a car in an area of the garage where we know the floor is dry. I'd make an appointment with the dealer and tell him you want him to pressurize your cooling system, keep the car overnight and check it for leaks. The most likely scenario is that you have one or more loose hose clamps, or something simple like that. But I think it's more likely that you are slowly leaking some coolant somewhere. It's possible that you were right on the edge, and a drop in temperature put the level just below the sensor. But I don't think the coolant would contract enough for you to lose an inch of it all at once in the overflow tank. Well, things do contract when they get cold, Lisa - ask any guy you know who's ever gone swimming in the ocean. Is there really a phenomenon of coolant "contracting" in cold weather that would explain the low level of coolant that I clearly saw? I have never experienced this with any other car, and I am finding it hard to believe. He said to just top it off and not worry about it. He said this is something that's expected and happens in the fall because of the change in temperature, and also because the coolant sensor is really high in the reservoir, so it thinks the coolant is low when it really isn't very low. The car is under warranty, and when I called the dealer, he seemed unconcerned. ![]() But now I am concerned that there is a coolant leak somewhere, even though I haven't noticed any puddles under my car. We filled the coolant, and the warning on the dashboard went away. I opened the hood and checked, and indeed the coolant level was about an inch below the "MIN" line. When going to start the car yesterday, a "low coolant, stop engine" warning came on the dash.
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