Chek the fuse in the fuse box on the driver side.Make sure it make good contact.Also 94 E420 have some blower fuse on the same sidethat you can reset by just pressing it.It is lokated wright over the driver side fender. If you do not have a refregerant leak it is important that the refregerant is not too mach either.I do not know if I am right but that is what I know. Good luck.
