The thermostat is in the radiator. Open the radiator lid and pull the thermostat out.
Using a key
u will need a odb1 scanner,
limited edition
Pull off the right front tire (passenger side) and you will see it.
14"
its a fuse
Fuel tank.
045
on the side of the engine block on the driver side. screws in. has 3 wires coming out of the connector running to the fan.
Check with manual gauge - if pressure normal - could be defevtive oil pressure sensor or gauge
Remove oil pan
The fuel pump relay on a 1991 Pontiac Sunbird LE is typically located in the engine compartment, within the fuse box. It may also be found on the driver’s side, near the firewall. For precise identification, it's best to consult the vehicle's service manual, which provides detailed diagrams and locations for electrical components.