How to judge the leakage and blockage of heater box in Le Chi? If it's just a jam, is there any good way to dredge it without disassembling the machine?

If there is water leakage, there will be water marks in the cab. The engine is short of water and the water temperature is high. If it is blocked, touch the two water pipes with your hands. Is it hot? One of them is not hot, which proves that it is blocked. It takes a long time to wash it down with a high-pressure water gun. If there is something wrong with the car, ask the car master. 4S shop professional technician, 10 minutes to solve.