I just replaced a 2001 Saturn automatic transmission for about $2500. Wasn't a salvage transmission, so it cost a good bit more.
Passlock sensor (Ignition housing) Or body control module fault
I get GM ignition switches over the counter at my local parts store. Housing? Try a car wrecking yard.
Under ignition coils
There are 3 different things that can cause the security lights to flash constantly on a 2002 Saturn Vue. These things are a bad passlock sensor in the ignition housing, a bad BCM, or a bad PCM.
To replace the thermostat in a 2002 Saturn L200, first ensure the engine is cool and disconnect the negative battery cable. Drain the coolant, then locate the thermostat housing, typically at the end of the upper radiator hose. Remove the housing bolts, take out the old thermostat, clean the mating surfaces, and install the new thermostat with a new gasket. Reassemble the housing, refill the coolant, and reconnect the battery.
It bolts to the top of the intake manifold. It should have to large plugs on top of it
The passlock sensor on a 2002 Saturn S-Series is located in the ignition lock cylinder. It's part of the anti-theft system and is typically integrated into the ignition assembly. To access it, you may need to remove the steering column covers and the ignition switch. Be cautious when working with the ignition system to avoid damaging components.
They go through the transmission bell housing from the driver side.
In the front of the motor by the transmission dipstick. This is where your spark plugs from the engine go.
The coil is located at the back of the intake manifold. There are two bolts that hold it to the intake, and two bolts that hold it to the head.
Drain the radiator into a container. Remove the top radiator hose at the engine. Remove the 2 bolts holding the thermostat housing. Remove the thermostat and clean the surfaces. Install the new thermostat, housing,and bolts. Reinstall the top radiator hose and fill with coolant.