Dividing the entrance and exit of Buick Regal heating pipes

The method of distinguishing the inlet and outlet of the Buick Regal heating water pipe is the temperature identification method. Touch or test the temperature of the water pipes. The hotter one is the water inlet pipe, and the cooler one is the water outlet pipe. A lack of antifreeze in the cooling system is the most common reason why the heater is not hot. When designing the engine cooling system, engineers will give priority to engine heat dissipation, and then the normal operation of the heater. When the coolant is insufficient, the coolant will be given priority to circulate in the engine. At this time, there is no water in the heater circulation pipe, and most of the heater water tank is air. At this time, the air conditioner heater is naturally not hot. After replenishing the antifreeze, the heater water tank is filled with hot coolant, and the heater will naturally heat up.