I drive a 98 Cobra that has been having overheating issues recently. I had the electric fan motor and the fan assembly replaced over the summer and just changed the t-stat today but neither is really helping. Also got the radiator tested and it's fine. I've noticed recently that sometimes the fan stops working, seemingly randomly. Once the fan doesn't come on, I can't get it on at all, but if I wait a few hours and come back later it works. I've read on a few posts that this has happened to other people and it turned out to be the plug for the fan. What should I do?