For the 3rd time this year I've had radiator (broken seal, top replacement, and core change). There seems to be problems to be bubbles in the radiator. I'm figuring this is all pointing to a head gasket replacement except, I don't have any overheating, she's running fine, no coolant is in the oil, and I don't smell any from the exhaust. A head gasket replacement is either gonna be a lot of time or money wasted if that isn't going to solve the problem. Any suggestions out there before I jump into this.

BTW...She's a right hand drive, and the radiator is 2 parts (don't know if that's normal or not)

Thanks