I tried what you all suggested but it keeps boiling over. I checked the thermostat it is a Behr brand and it is in correctly. I ran the car for 10 minutes in park with the overflow cap off and some bubbles came out then it boiled over. About 3 quarters worth of a gallon. Possible bad thermostat still? Or should I try to clean the radiator and how do I do that? Also the interior smells like coolant, so I'm guessing bad heater core, could that be the problem?

__________________
I am not who you think I am