Quote:
Originally Posted by Jfheisenberg
I want to sleep better at night, so im buying some blue subaru coolant =D
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Time for my normal statement on this subject!
That tank is a coolant expansion reservoir and is not directly related to the cooling system of the car. It's only purpose in the system is to deal with excess coolant when it expands in the rest of the system. When hot it will force coolant into the tank and when cool it will suck it back into the system. Back in the day the overflow was blown out a tube onto the road but the tree huggers tend to frown on this now.
Because that tank is low does not mean your system is low. As long as there is a drop left in the bottom that means the system it's self is full. In reality it is possible that the system has never needed to add or take back a drop of what was in that tank and it has simply evaporated without even going into the rad.
As said several times there is no need to put actual coolant on there. The components of the coolant do not evaporate but just the water does. Just fill it with distilled water and it will keep your coolant at the right mix. If you keep pouring coolant in and evaporating the water off then it will eventually thicken up (
very eventually but it will).
If it makes you feel better then you can alternate fill ups between pure water and coolant but there is no real need to.