Why is the old Poussin warm wind not hot?

The editor provides you with the following related content on "Why is the old Poussin heater not hot?":

The reason why the old Poussin heater is not hot is: 1. The thermostat is always open or the thermostat is opened too early, causing the cooling system to perform a large cycle prematurely, while the external temperature is very low; 2. The water pump impeller is damaged or lost, resulting in insufficient flow through the small warm air water tank. , the heat cannot come up; 3. The engine cooling system has air blockage, which leads to poor circulation of the cooling system; 4. The filter is dirty and blocked, resulting in insufficient air volume or poor hot and cold air distribution, which reduces the heat of the small warm air water tank. Can't spread out. Poussin is the Santana model of the Volkswagen series. It is a brand car produced by the German Volkswagen Company in California, USA. Its models include: Santana 87, Santana 2000, Santana 3000, Santana Vista Zhijun, new Santana, etc.