A Thermostat dictates how cool your motor operates. Do you have an R/T? I didn't notice the model you had. Anyways, you can buy a new thermo for $20-$30 bucks. I guess the type of Charger would determine which one you buy. A thermostat opens up a certain tempurate and allows coolant to circulate throw the engine block. The lower degree thermo you have, the sooner it will open, allowing fluid to travel through and keeping your block cooler. It you disconnect the radiator hose connecting to the engine block, you will see it seated right there. Hope this helpswhats the thermo stat n how do i change it?