What should I do if the car air conditioning heater water tank does not have a vent valve or a water drain device?

If the car air conditioning heater water tank does not have a vent valve or water draining device, this may make venting and draining the water more difficult, but it is not without solutions. Here are some ways to handle this situation:

Use other methods of venting and draining water: Even if you don’t have a dedicated vent valve or drain device, there are still other ways to vent and drain the water. For example, the heater tank hose connector can be gently loosened to release air and coolant. Then, help the air and fluid drain out by tilting the vehicle or gently tapping the tank.

Use Special Tools: Some special tools and equipment can help with venting and draining water, even if there is no vent valve or drain. For example, you can use a hand-held pump or a vacuum pump to extract the coolant to drain it.

Get professional help: If dealing with the exhaust and water drain yourself is difficult or impractical, seek help from a professional auto repair technician. They will usually have the appropriate tools and experience to handle these issues more easily and ensure operations are safe and effective.

Install the exhaust valve or drain device: If you find that the exhaust valve or drain device is indeed missing or damaged, you can consider installing a new exhaust valve or drain device. This requires a certain amount of skill and expertise and is best done by an experienced auto repair technician.

Even if the car air conditioning heater water tank does not have a vent valve or a water drain device, there are still some ways to vent and drain the water. However, it is better to repair or install these units as early as possible to make future maintenance and operation easier.