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Does anyone know how low the coolant needs to be in the overflow tank before the low coolant light comes on? Or do our cars not have one? I am just curious.
 

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I just realized that our degas bottle (coolant reservoir) doesn't have a sensor - crazy!

I flushed the coolant last weekend and I took the degas bottle off and cleaned it as best as I could and didn't even think about how there was no coolant level sensor to disconnect.

There's still a bunch of crud in my degas bottle and hoses from my small air leak that Ford couldn't find (it was a hose connection). I didn't think to buy a replacement reservoir before I started draining the coolant.
 

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From other users' experiences (mine included), the coolant generally runs on the low side of the tank. Typically, when hot, my level is just above the 'low' line, yet I never have any issues. My best suggestion would be to mark on the tank with a sharpie where the coolant sits when hot and when cold. If it drops below those points, you know you've got a leak.
 
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