Hi there, so my radiator is leaking bad so i'm getting a new (used) one from a junkyard. the junkyard has s4 and s5 radiators. I am not sure which one I need because It seems that I have an s5 rad in my s4. I have two radiator caps and don't believe the neck is "sticking out". Any help with identifying my current rad and figuring out which one I need to purchase that will fit. Thanks!

 

There are 2 kinds of S4 radiators and 1 kind of S5. S4s can have radiators without any cap on them (it's on the thermostat cover instead), and they can also one on the radiator itself. S5 is similar, and has the extended neck near the battery that has a cap. In your case, you can use any of them you like, but an S5 would likely require trimming the fan shroud.