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you may need to go to the salvage yard to buy a replacement control module( the whole thing that allows you control of the fan, etc.) it should pop out with tabs and unplug with prongs like an electrical outlet, only more prongs and THIN and DELICATE. so be careful. don't have the rip your dash apart if this is the problem!

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Q: Why would a 1999 buick laSabre heater stop working?
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