Toyota: 1999 Toyota Tacoma Pre-Runner - AC Problem, pre runner, toyota tacoma

Question
I own a 1999 Toyota Tacoma Pre-Runner; 2x4; V-6.  The AC works; however, it's only intermittently.  It would be nice and cold going to work in the morning; but hot as heck going home in the evening - it would just blow warm and hot air.

I recently had the freon purged and replaced; however, this did not solve the hot and cold problem.

Please help.  Your help would be greatly appreciated.

Thanks.

T. K.

Answer
Have you had anybody check the A/C compressor?  When the A/C is blowing cold air but you still have the A/C and all the switches set so it would, does it sound like the compressor stops or stopped?  Have you had any check engine lights come on?  Any other warning lights?