coolant problem 1994 500sl

[geno]

I pulled into my garage and walked around the car and noticed a large amount of coolant running under the car.While driving I didn't notice any increase in temperature and I'm sure the warning light didn't come on.I put some coolant in and the car and it seems to operate fine.Needless to say, I'm hesitant to drive any distance until the problem is corrected.
I have ordered a new coolant cap-just in case.
I now tend to believe possibly the auxilary fans didn't kick in with the increase in temperature after the engine was shut off.

Does anyone have an input as to what might be my solution?
also,does anyone know if there is a fuse and/or relay for the auxiliary fans and where they are located?
Any suggestions would be appreciated.