gsxr,
Thank you for the clarification. I was looking at the wiring for the fan and it seems to run straight into the fuse box with only an in-line plug between the fan and fuse box, so I'm not sure how to see if the fan is getting the signal it needs at the proper time/temp.

rrgrassi,
given the car's symptoms, how do you suggest I proceed? Especially if a UMO analysis may not show coolant in the oil even if the head is cracked? The car, after it warms up, runs great. I hate to go looking for problems.