on the firewall side of the engine below the intake.
On the 1995 Saturn SL1 The oil pressure sending unit is the sensor closest to the alternator. The unit is on the back of the block.
The speed sensor on a 1999 Saturn SL1 is under the transmission. It is below the fittings for the transmission cooler lines.
fan does not kick on . when wired direct, it comes on. could it be the sensor?
Yes
R-134A
The thermostat on a 1995 Saturn SL1 is located on top of the motor. The largest hose coming off the radiator will have to be loosened to access the thermostat housing on the motor.
Buy a car that isn't a Saturn
My son's 1999 Salvaged/total Saturn SL1 was rebuilt using many engine and body parts from 1995-1999 Saturn SL1 and SL2 cars, I believe it will work fine. I do not recommend before 1995 or 2000 or later models. I do not recommend SL2 either. I am not the expert but most of my son's engine is not 1999 SL1. Good luck!
behind the catalytic converter
12.8 Us gallons
throttle posistion sensor or vacuum leak
The sensor is on the transmission above the right drive axle two wires to it