A/C causing Overheating
 

Ok guys! got one for ya.
i am not a beginner when i comes to engines, however i am stumped.

1988 Camry 3SFE

Car only overheats when a/c is turned on.

I replaced t-stat (w/ 180f)
Replaced Radiator fan Switch
Drained/Flushed/Fill Radiator with professional cleaner and water
(radiator resivoir needs weekly refilling)

will a/c compressor overheat and raise temp?
The radiator fans do work. (if they run properly is a question)
Could it be indicator gauge sensor?
Could it be a faulty Water Pump?
Radiator Cap is new and at 13lbs
All fuses are good and/or replaced

Without a/c car temp runs fine. (and in winter)
Im familiar with engine coolant systems and fixing them, just not diagnosing them.

thanks for your help