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You locate the heater core by following the heater hoses in the engine compartment. These hoses need to be disconnected. Then, working inside the passenger compartment, take off all of the control panel. You'll see screws underneath if you lie on your back. The only trick is to pop out the vent louvers -- just pop them out with a screw driver. There are screws behind them. Take out the glove box. Take off the heater outlet duct and the heater core cover. Pull the heater core straight back to avoid breaking the drain tube. Remove some clamps and that's it.
Your heater core needs to be replaced. The heater core is like a mini radiator, providing heat for the interior by coolant circulating from the engine, into the heater core, and back to the engine again. Like a radiator, a heater core can spring a leak, especially w/ age as a factor. This results in the leak inside the car, which also causes the 'smoke' you see, which is actually vapor form of coolant.
Pull the panel under the glove box. You should be able to see the heater core. disconnect the two hoses under the hood on the firewall to the heater core. put a pan below to catch the antifreeze. Replace heater core. reconnect hoses.