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Based on the description from the Advanced AutoParts website, you should check the engine for the sensor. I would use a picture of the sensor to guide you in locating it around the engine area of your Buick. The item looks like a magnifying glass with no glass with bronze colored piece that lays within a black circle. You'll see what I'm talking about when you run it's name in a search engine image search.
Question edited for clarity.
Question moved to Model category.
Get a can of WD40 with the red straw nozzle and insert it above or below the key and flood it (5 second spray). Remove the straw, jiggle, pull and release.
Is the coolant full ? Any lights lit on the instrument cluster , check engine , wrench symbol ? Hooking up a factory or some other professional type scanner an viewing data from the HVAC module mite show a cause .
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