2005 Ford 500 speedometer lights up to 70mph, no lights after that?

dont know about lights,thats a new one on me,as for the ac,is compressor kicking on.3 problems,bad compressor,bad low pressure switch,low on R134A,have a can or 2 put in,see how it goes.may be a leak in the system.do this first,have your mechanic do a vac test on it,if it holds vac ,no leak.then recharge.

It was not the freon. They think the compressor is the problem. Mechanic has worked on alot of the 500's and it has been the compressors.

yea,the 500 for some reason has bad compressors.

I have the same issue with the speedometer on my 500, except mine only lights up from 70-120. Did you ever figure the issue out with yours? Any help would be much appreciated.