I drive a 94 camry and I am loosing all the coolant in the radiator and I cant find where it is leaking at. I had my granddad fix the car and it worked for about one and half months then it started doing the same thing like it did before. I had a new head gasket, head checked three valves fixed, new wires, new distrubitor, spark plugs, valve cover gasket, you name it I had it checked out or replaced. I need to know what it is asap so I can fix it and drive it or sell it.

Make sure your cooling system is full. Then preform a pressure test on the system. When pressure starts to drop inspect for leaks. Also remove the spark plugs and check there for coolant to. Some auto parts stores will loan you the test kit.

Yes. It's a good idea to wash the engine bay out first. Nothin like pokin around under the car at the rad/heater hoses and getting a face full of road grime.

Also try to check the core plugs on the engine block it could be that one or two are leaking