The heater switch valve of freight car leaks water.

the reasons may be inferior antifreeze, strong permeability, defects in the parts themselves, high pressure or overheating in the cooling system.

1. The metal tube is leaking due to corrosion, welding cracking, vibration cracking and other reasons, so we have to replace it; 2. The rubber tube is damaged and leaked due to poor temperature difference resistance and pulse pressure resistance, so we have to replace it; 3. The joint between the metal tube and the rubber tube is leaking, so we need to replace the clamp or reinstall it; 4. Check whether the warm air water tank is damaged.