1. Check the hot and cold windshield to see if the air conditioner is set to the hot windshield.
2. Check the electronic fan temperature control switch.
3. Check the water temperature thermostat.
Generally speaking, the vehicle heating system is not hot, which can be divided into two reasons: one is caused by the engine cooling system, and the other is caused by poor operation of the heating control mechanism. These problems are more difficult than ordinary car owners, and some of them are more complicated to maintain, so please ask professionals.