I use toyota camry 1996 model.I was on highway when I noticed my car temprature was rising,I pulled over to see that the collant cup was filled with hot/boiling water,while d radiator was empty.
The car moves well,but short water or transfer water from radiator to coolant cup especially when I accellerate well/down.
I have changed my radiator to double cell,yet no change.I also discorvered that when I start the engine in the morning,I hear noice from the water pump/timing belt area,but disappear after after some minutes.this was weeks before the over heating started.what could be the problem?I really don't want the mechanics to tamper which the car without knowing what the actual cause could be.
I will be waiting for your answer.
Rgds,
Sabasatine (Nigeria)

The overheated aluminum head may have warped and blown the head gasket. If so, the head may need to be machined, valves repaired, and a new head gasket installed.