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If there is no visible leak outside in the engine compartment that might drip onto the exhaust mainfold to get drawn into the passenger cabin, the heater core is begining to leak inside in the heater plenum inside the passenger cabin..
rather than trying to type the procedure from memory
my best tip is to stop by the library + check out a
chiltons/moter/ or mitchells repair manual any of
these will have all the step by steps + diagrams
you'll need for the job. hope this helps good luck
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.