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Damnit. They topped it off but didn't use Subaru Blue coolant. Hopefully it's an equivalent.
From what I could tell, coolant temp is getting to operating temp faster but I'm trying to rationalize this maybe someone else can chime in.
Ideal gas law tells us that PV=nRT (pressure, volume, n=moles, r=constant, temp)
Volume of the vessel holding the coolant stayed constant but the moles of coolant went up so in a closed state pressure increases.
Now I need a car guy to tell me if the coolant "Vessel" is actually closed. Does the car have an overflow hose or anything? Even something to relieve pressure?
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