I had bought this 2000 Mustang GT from a person and now it’s hitting winter and I have no heat whatsoever. There are no hoses running from the heater core to the inside of the cab and there’s what looks like a random thermostat in the glove compartment. Should I buy a whole new heater core assembly, or can I buy bits and pieces I need to get the heat working again? I would rather buy the whole assembly, can anyone link me to a website selling an assembly for the heater core?