First, the surface of the old warm air water tank is dirty, blocking the cooling hole, resulting in poor heat dissipation.
Solution: After replacing the new warm air tank, the ventilation volume of the exhaust hole increases and the temperature is normal.
Second, the internal circulation air inlet can't be closed normally, which leads to excessive external cold air flow and reduces the heating effect.
Solution: It is recommended to check the heating system one by one to ensure that the heating system works normally.
Remarks: If you are not familiar with car maintenance, it is recommended to go to 4S shop for inspection and maintenance.