youthebest

I have 95 c280.
The AC has been working fine till this afternoon.
since I got back from circuit city to install keyless entry system, I get no cold air.

I was wondering if there is any wiring for ac compressor or similar underneath the driver's side doorstep. (where it says mercedes benz on the chrome)
CC guy did all the wiring for the keyless under the doorstep.
They also tried to open the cover behind the steering wheel(under the dashboard) and counldn't open it. They kept trying to prop open it and failed.
I heard that there's AC filter in there, so should there be AC related stuff?

Or is my ac compressor system dead all of sudden.

Could you guys tell me few things I cound check for my self like fuse or relay.
I don't know where they are.
Please help me.