I am checking my ac thats not working on my ford transit connect .I came to a problem that the expansion valve has no power coming to it .I check all fuse and relad everything working fine

Hands on electrical testing is needed. Here is a link to find a shop near you.https://repairpal.com/repair-shops Alex

Your vehicle does not have an expansion valve.It works with an orifice tube and it is NOT an electrical part.If the compressor is coming on, next step is to check the low and high pressures in the system.We ll be glad to help you get it fixed and explain you how the system works.