sorry if this is a repost...

Ok my 1988 535IS prior to being parked for 2 years I put in new; compressor/receiver dryer/hoses and the AC blew cold nicely.

After I started it went for a trip and the AC has no cold air,

The compressor is kicking in the sight glass on the rec/dryer has no bubbles...so WTF is the AC not blowing cold?

Do I need an expansion valve? That's the only thing I didn't change.

Thx in advance.