What is the reason why the warm air in Tiguan is not hot?

The reasons why the warm air in Tiguan is not hot are: 1, and the warm air tank is blocked; 2. There is something wrong with the air supply device. The way to turn on the warm air is: 1, click the one-button start button of the vehicle to start the engine of the vehicle; 2. Find the vehicle air conditioning system in the vehicle cockpit and click the close button on the vehicle air conditioning system; 3. Click the AC switch on the air conditioner and turn the temperature adjustment knob. The length, width and height of Tiguan are 4506mm, 1809mm and 1685mm respectively, with a wheelbase of 2684 mm, and it is equipped with a 6-speed automatic manual transmission. The car has a top speed of 190km, and is equipped with tire pressure monitoring, front seat belt unfastened prompt, body stability control and rear radar.