In the 1994 Corsica 3.1 Litre the radiator hoses ar at the lower RH end and the upper LH end of the radiator as viewed from the driver's seat.
to engine and rad
The low pressure valve on a 93 Chevy Corsica is under the hood. It is on the larger hose coming off the AC air compressor.
It is in the water outlet at the bottom of the large top rad hose.
Follow the upper rad hose from the rad to the engine and you will find it at the end of the hose, when replacing the thermostat, make sure the spring goes toward the enigne. It is under Thermostat Houseing. Just follow top rad.Hose away from Rad. Its under the houseing that the hose connects to on motor side of hose.
if you follow the upper rad hose towards the engine, where the hose attaches to the motor it is under that housing.
Should be in a removable housing at the engine end of the upper radiator hose
the temp sensor is on the thermostadt but it doesnt control the rad fan. you're thinking about the rad fan switch which is in one of the fenders by the firewall or right on the rad support.
The thermostat is locating in the waterpump, where the lower rad. hose connects.
under the bottem rad. hose
There is a drain on the lower right of the rad. If you can't get to it, pull the lower hose.
Low pressure side of compressor (larger hose)
Follow the top rad hose to the engine , There you will find the housing undo bolts , clean gasket on housing replace with new gasket and thermostat. Make sure engine is cool and drain anti-freeze first