If the hole is no bigger than a few inches around, i would just find a way to seal it off so nothing can get inside the bell housing. If the hole is very big it can cause stress cracks.
Where is the thermostat located on a 1987 Buick LeSabre?
Because its a 1988 Buick LeSabre
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Amazingkeys.com has the 2000 Buick LeSabre Key. It does have the chip in it.