what type of coolant can i use for the system on 2002 Chrysler 300M

have a weird smell coming through the ac vent and my car starting to slightly head over the middle line of the high heat area.

Asked by for the 2002 Chrysler 300M
Sounds like the heater core is beginning to leak and as for the coolant always use the same color that is in the vehicle, Prestone brand is the best choice