Q: Heater core or head gasket 2001 Ford Mustang

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Cars vents emit white smoke and smoke from rear of engine bay in front of the firewall. When I shined a flashlight in the tailpipes after it was cut off bc white smoke was coming out the exhaust it was thick and white. Oil is normal color and engine overheats when heat is on obviously bc there's a coolant leak somewhere. I just don't know the exact diagnosis I don't want to pull my supercharger off and replace the head gasket if that's not the problem

My car has 90000 miles.
My car has a manual transmission.

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