I have a City 2006 with automatic transmission. I am facing a problem with my car, and I can't understand its solution. The water level in my car's radiator is decreasing, but there is water in the bottle. Only the radiator is losing water; it's not sucking water from the bottle. Because of this, the car heats up after driving 30 kilometers. I showed it to a mechanic, and he said the radiator is blocked and serviced it, but the problem persists. Now the mechanic is suggesting replacing the engine and gearbox to fix it. Can you suggest what the solution might be?