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Sounds like you could have a leak in your heater core. Not positive on the location in the LeSabre, personally I am familiar with the Regal of that era where the the heater core is located under the dash on the passenger side along with the blower motor. Check the carpeting on the floor pan for any tell tale antifreeze. Follow your heater hoses and see where they lead you. If you have antifreeze in the heater box you need to change out the core. Sometimes after a flush you will dislodge sediment that previously had been blocking pin hole leaks in the heater core and you will spring a leak. You could try a radiator sealant but you will only delay the inevitable and possibly cause further problems.

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Q: Why does your 1997 Buick Le Sabre have a smell coming through the vents when you just had the Antifreeze flushed and refilled but the odor still lingers kind of a burning antifreeze smell?
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