Ok, it's been a while since I had a fan clutch so if I'm wrong don't hate me. I quickly moved to an elect. fan.
The fan should have the same resistance going both ways. If it doesn't, then it's possiable that the fan clutch is going bad.
I have a fan clutch that I bought (not temp) that I have about 5-6K miles on it, and has been sitting in my garage for a while now. It's stiff both ways when I turn it. I want to say it only cost me about 40 bucks at Autozone when I got it, but I'm not sure.
Sorry if I'm not much help, but this might give you a start....