hey I have a 2001 gs300 and it’s not a huge issue but I wanna know if it’s something I should be considering changing or fixing. So when I turn the heater on I haven’t tried with a/c. Only when it’s put on the option where it only heats the head it makes a buzzing noise for like 10 seconds and goes away. It heats fine no weird smells it’s just on that option all the other options work fine no buzz no nothing. I’m not getting any codes so I just wanted some opinion on this.