It's a sealed system, there is no cap.
READ NEXT BIT IF YOU HAVE COOLANT LEAK!!!
*This next portion edited by separate searcher/learner* Thanks Clay for your answer, I found the same... there is NO radiator cap on this particular model/year. I searched for this information because I was caught in a bind and needed a quick fix until I could properly maintenance my vehicle and replace the radiator myself. My problem: I discovered a decent-sized leak (ie constant stream/squirt) on the metal, driver's side end of my radiator and needed to drive across town early the next morning for work-- so I bought a reputable brand of coolant "stop-leak" (Aluma seal) from a parts store, but when I went to put the product directly in the radiator (and NOT just in the overflow reservoir) as it specifically tells you to do, I ran into the problem of it being a closed system. I therefor improvised and bypassed this problem by loosening/detaching the upper hose (driver's side attached to the radiator) on the end closest to the firewall-- to allow for siphoning when you're ready to pour the 'stop-leak' product into the radiator. I just poured it in, whether it's the dry-powder form or pre-mixed form, into the hose, waited for it to drain into the radiator, then followed it up with a 50/50 mix of coolant/water to make sure it all made it in the radiator.
I may have improvised here, but you gotta do what you gotta do when you're in a 'bind'. I may be an amateur when it comes to home auto repair, but this actually worked wonderfully for me and allowed me plenty of time to fix/replace the radiator properly at my convenience. Just an idea, hope it helps someone out there since nothing I searched for online helped me before I tried this...
The starter on a 2001 Saturn SL1 is located on the driver's side of the engine. It is just to the left and in front of the alternator/generator.
PULL
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.
they are located behind radiator and intake muffler. there are a couple of bolts and they come out in sets of 2
behind the catalytic converter
If Im not mistaken, the Pressure cap for a Saturn is the twist on cap on top of the coolant resovoir, if the cap say under pressure then that is it and to add coolant to radiator you fill it thru the res.
Thermostat is located on the passenger side of the engine. If you look where the two hoses are going from the radiator and the resiviour this part comes out and the thermostat is located underneath.
Follow the upper radiator hose from the radiator to the engine and at the engine you will find a housing with the thermostat inside. When replacing it make sure the spring goes toward the engine.
Yes, it most certainly does.
In the tank.
Check behind the engine underneath, usually towards the right hand side. Below the alternator.
up a mountain