Heater cores are usually a bitch to get at in a lot of cars, located behind the dash and against the firewall, usually on the passenger side. If you look under the hood you'll see two coolant hoses usually close together, that are the sending and return lines for the core. I'd say the quickest and cheapest thing to do is replace the thermostat quick. If it is stuck open the car will not warm up easily since the coolant runs through the radiator then.
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