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thermometer mirror


jeff mazur
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  • 2 weeks later...

I believe you are talking about the fiber optic cable.  The cable connected to a bulb with a special socket inside the door.  It illuminated the thermometer when the park or headlamps were on.  There was no temperature sensor for the mirror.  My experience was with Oldsmobile.  Buick was probably the same.

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If you shine a bright light on the cable end while in an area not getting direct light you should see some illumination of the temp gage if indeed it is a fiber optic cable.  The glass like fibers in the cable will “carry” the light to its destination.

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