A quick question if anyone has done a thermostat on this vehicle. 3800 engine.
Does the housing have only one bolt to hold it?? It appears that way , as it is cramped area to see. Also I assume it will have an O ring gasket as well??
Thanks for the help
Al

I've never seen one bolt securing the thermostat housing on a Buick or any car. I would assume the other bolt is obscured. They normally have a thermostat mounting rubber gasket, not an o-ring.