It depends on the temperature of the two inlet pipes of the warm air small water tank. If both water pipes are cold, or one is hot and the other is cold, there is something wrong with the cooling system.
Coolant is called antifreeze, which is the hot air source of automobile air conditioning. Insufficient coolant in the cooling system is the most common and easily solved fault phenomenon, which will lead to the phenomenon that hot air is not turned on.
Methods of replacing automobile coolant:
1. Before changing the coolant, you must wait 10 minutes after the vehicle is turned off. After driving, the coolant temperature is very high and it is easy to burn.
2. Conduct an all-round inspection of the vehicle: check the pipeline for signs of leakage and cracks, and check the five-way water pipe. If this part of the coolant leaks, replace the water pipe or re-fix the connection according to the situation.
3. Lift the vehicle with a jack.
4. Tighten the screws of the bottom shell of the water tank with a wrench, and connect the old liquid with the waste basin.
5. Cover the expansion box cover with a thick towel, slowly loosen it until the air pressure is exhausted, and then completely remove the box cover. Use a compressed air spray gun or a thick towel to pressurize the water inlet of the expansion tank and remove it from the engine block as much as possible.
6. Add softened water and idle for 5 minutes, so that the inside of the cooling circulation system can be fully cleaned.
7. Add new antifreeze to the upper limit of water level.
8. Run at idle speed for 5 minutes, then observe the scale line of antifreeze tank and fill it up.