Car Problems.Overheating and Speedometer?

I just recently bought a 98 ford escort zx2. I was driving it and noticed it started to overheat. It doesn t have a number on my gage but it was about 3/4 of the way up, well over half way. Also, my radiator fan does not turn on by itself unless I turn the A/C on. I replaced the relay and temperature sensor, neither have helped. Why would my radiator fan not turn on?

I know my mechanic said I have a leak in my radiator. He is going to replace that but he doesn t know why my fan won t turn on.

I also noticed my speed odometer is wrong. I used a couple phone apps, and it s off by about 8mph. And my cruise control doesn t work. Would this be the cause of a faulty vehicle speed sensor?

Any help is greatly appreciated!

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