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What does a heater coil do when it gos out?

(1999 Chevrolet Monte Carlo)
in Wichita, KS on October 01, 2012
I have a 1999 monto carlo i think it is a 3.8 l engine. I just tried to turn to heater off to get the chill off inside when it would not heat up but all of the sudden it started to warm up but a puff of smoke or steam come out of the middle vent. it did have a smell but i can't say it smelled like coolant but it did have a smell.

could it be a heater coil? nothin is leaking on the floor . what is the avgerge cost to repair and labor?

thanks for your help.
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of Greg's Orange Auto on October 02, 2012
heater cores will leak on frt pass side floor and soak carpet. did the smoke smell sweet?
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on October 12, 2012
yes it was the heater core it was sweet smell thanks for your input .
on October 01, 2012
I assume your talking about the heater core if it is leaking the inside of the windshield should fog up with the heater on
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on October 02, 2012
sorry yes the heater core, it is fog up a little it has not leaked inside the car like it did when mine went out on my 68 camaro. thanks that is what i thought it was.
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