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 as follows: 1. The warm air tank is blocked; 2. There is a problem with the air supply mechanism. The method for turning on the warm air is as follows: 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 cockpit of the vehicle and click the off 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 456mm, 189mm and 1685mm respectively, and the wheelbase is 2684 mm. It is equipped with a 6-speed automatic manual transmission. The maximum speed of the car is 19 kilometers per hour, and it is equipped with tire pressure monitoring, front seat belt unfastened prompt, body stability control and rear radar.