The BYD SEALION 6 uses engine coolant waste heat or PTC air heating. Learn how each source transfers heat and how the blower, air doors and ducts deliver warm air to the cabin and windshield.
The heating system of BYD SEALION 6 uses engine coolant waste heat or PTC air heating to warm the cabin and defrost the windshield. The two methods use different heat sources, but both require the blower and ducts to deliver heat to the occupants and near the glass. To understand heating performance, you need to look at both where the heat is generated and how the warm air ultimately reaches the positions where it is needed.
Coolant-based heating uses heat produced while the engine is running. After absorbing heat, the coolant is pumped by the water pump through the heater inlet pipe into the heat exchanger. Air from the blower passes through the exchanger and carries heat into the cabin or toward the windshield. The coolant then returns through the heater outlet pipe after releasing heat. Coolant transports the heat, while the heat exchanger transfers it to the air: the two play different roles.
PTC air heating generates heat through the integrated heater assembly, and then delivers warm air through the blower and ducts. The heating and cooling of BYD SEALION 6 share the blower and ducts, and the heater unit housing and evaporator housing are also made as one piece. Although the cool air and warm air in the cabin come from different heat exchange processes, the air delivery is completed within the same air conditioning system.
The mode doors, temperature blend doors and fresh-air/recirculation doors in the HVAC unit are all motor-controlled and participate in air distribution, mixing and circulation. When analyzing BYD SEALION 6 heating problems, the heat-source condition and air-delivery performance need to be considered together: coolant-based heating involves coolant and the heat exchanger, PTC heating involves the heater, and the doors and ducts determine how air flows. This system view provides a clear direction for checking both whether heat is produced and whether warm air reaches the required location.
In EVCando, select BYD SEALION 6 to view the corresponding repair manual; combine the Diagnose and Wiring functions to continue learning about related systems.
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