Cooling Problem [Archive] - Toyota MR2 Message Board

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I have a 91 Turbo. The car has 114K miles. At 89K I had the head done, timing belt, water pump, and thermostat replaced. About a month ago the car started to boil over in the overflow tank. This would happen only if I was going about 70+mph. I took the car to ToyoTechs, they replaced the thermostat, radiator, and fan; this did not solve the problem. They now tell me that the Head or Head Gasket is probably bad. Does anyone have any ideas on what is going on with my car. If I drive the car very