Quote:
Originally Posted by CruiseZen
I'm sure you lose a little, especially if you are in an arid environment. However, the amount should be negligible. I'd be surprised if evaporation through that hole exceeded a gallon per year.
If you are losing fluid, you may have a slow leak somewhere. Just keep an eye on fluid levels and top off when necessary.
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Yeah but you also have to take into consideration that the coolant is at higher temperatures while the car is running. The higher temperature the higher the rate of evaporation.