I believe many people can hear the reason why Honda hybrid has no ptc, and it is also because it started as soon as it turned on the warm air engine. If ptc can generate heat, why start the engine? This truth is also very simple. Briefly, that is, for reference. For example, if you go to see the household air conditioner at home, many air conditioners will have an electric auxiliary heat in addition to the heating of this normal air conditioner. You can have a look if you don't believe me.
It's too cold. Using air conditioning heating and electric auxiliary heating at the same time can make the indoor temperature rise faster and the hot air come out faster.
The same is true for hybrid cars. Do you say that with ptc, there is no need for engine heating? That's not true. What do you think of ptc power supply? About one or two kilowatts. What is the capacity of a hybrid battery like Toyota Honda? Only about one or two degrees. Usually it's only half for you, that is, almost half an hour. This ptc is dead. How to heat only by ptc? So the engine needs heating.
Then someone said, hey, what if I don't have your epc diagram?
There's another way. You can look through your manual to see which chapter has ptc fuses. It can be verified quickly here.