So i have a 92 sc300 ac was working excellent til a few months ago i do not know what happened i hit the button for ac so it can turn on but the green light doesnt turn on then i hit the button to increase fan speed ac light turns on but no ac anyone knows what it can be i need ac badly i live in florida and summer is beating me badly

 

Check for leaks, looks like you have low Freon causing the compressor not to turn on. Your car is a 92 so it will have the older R12 Freon unless it was converted to R134. The R12 is hard to find and vey expensive.
You might want to get a reputable shop to look at it or buy a R134 conversion kit from the auto parts store and recharge the system.
Good luck and stay cool.

 

Its r134 freon but i must check cause it says its mechanical issue like its in the red zone when i had my buddy put his gauge to check we emptied it and filled it up again but it went to the red again must i have to flush the entire system it has no leaks used a black light even inside all behind the dash and no spot of leaks.