Smell = Coolant?
I've noticed an occasional smell that was present when I entered the closed car after sitting a long time, overnight. It was like coolant. So I have been watching. But I've decided it might be water from air conditioning and a little moldy smell coming from that.
I tried parking the car with the windows closed after the car was good and hot and the radiator was pressurized and a leak in heater would have seeped slightly at least. No smell. I've checked under water pump and around elbows on manifold to water pump looking for seeps. None found.
So don't panic unless it happens every time the car is closed up and has hot coolant under pressure that seeps and gives the smell.
My neighbors probably think I'm crazy when they see me open the hood after the hot car sits an hour and I'm going around the motor and radiator sniffing for scent of DexCool!!!
Dual auto air on both