can i tumpang thread? i also drive 4g13 1.3 injection satria manual. i also plan to top overhaul my car. the mileage already 210++km. i can see leaks at the head, going to manifold. car jalan as usual, but the leak is quite bad. no white smoke, but a little revving shows some. im afraid if the car jammed and cant start anymore. is top overhaul recommended for my case?

my aircond compressor rosak already. also when i on aircond when the car is idle, the temperature rising slowly, but i off the engine quickly.