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wouldn't I be losing fluid if it was a blown head gasket?


Depends, if it is a high pressure leak from the cylinder into the cooling system, then usually no fluid loss unless the system is overpressurized to the point the rad. cap blows and overflows the recovery bottle. I've had that happen a number of times on various vehicles and never had coolant loss (in the beginning) or coolant/oil mixing or any external leaks.

Pressure test will give you the answer or a ~$20 chemical test kit will do that as well.