Several-problems are in question.
1) low antifreeze coolant.
2)vacuum hose is unplugged from the circulation valve.
3) problem with your temperature control unit, heat/coldzperiodz
4) if it overheats is got stack thermostat.
5) the hose is bad having a bobble inside there for crating restriction flow of antifreeze.
i can not find it
Check www.autozone.com
In a 1996 Buick Park Avenue, the fuse for the heat sensor is typically located in the fuse box under the dashboard on the driver's side. You can find the fuse box cover labeled with the specific functions of each fuse, including the one for the heat sensor. If you're having trouble locating it, refer to the owner's manual for a detailed diagram. Always ensure the vehicle is off before checking or replacing fuses.
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Google 1996 Buick Regal Custom and see.
When in doubt, call a GM dealer's service department.
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