I have a old carrier condensing unit the fan motor went out.So I went and got another one. Wired it back just like the other one was.It ran for about an hour then it went out.Just put another one in it ran for a few minutes then went out.Can anyone help me?

You need to replace the capacitor with a new cap that matches the new motor. If cap is bad or wrong "size" the new motor or even old motor will not function properly.