1991 Lexus Ls400 A/c Does Not Work

[weazel8]

I just recenlty bought a 1991 LS400 with 189,000 miles. I bought it knowing the the A/C didn't work. I was going to recharge it. I checked it out and it hadn't been converted yet. So i went about converting it and when I did the pressure check there was no pressure so I assumed that there was no R-12 in it. So I began to inject the R-134 in it when I realized I didn't have a good seal and my pressure was good, but I had already injected a small amount of R-134 in to the system. So my quesiton is this. Is it bad if there is a small amount of R-134 mixed in with the R-12? Also no that I have done that my AC light flashes. I cant read any of the codes because my LCD is blacked out. Any ideas on what the problem for the no A/c would be as well

[weazel8]

One thing I have noticed is that my A/C light blinks when the car is started. I cant read any of the LCD codes beacause my LCD display is bad.

[monarch]

No residual pressure = no residual refrigerant was in the system. There were recent threads on recharging the '91 LS400 and they answer the questions you have posed.

[weazel8]

Is the was the blinking light means is not residual pressure?