Air con issue

[sh0rtlife]

so let me clear the presures up

the system requires X pressure, and the sensor must see the pressure..something above 20 and below 45 psi
next the comp kicks on and builds pressure, anything up to around 200psi before being shut down

my question to them when they say presures are fine would be..to see what the "high side" is with the engine running....if your getting correct pressures on both high and low side then the comp is FINE

the bigger issue with "old cars" is that inevitable someone will have put some stop leak in which plugs the pressure control orifice plate and is useualy the cause of most of the issues..its this same stop leak that tends to kill the pressure sensor

after that the best thing i can say to do is see if both the condensor and evap are unobstructed..you could even have a bad blend door in the heater or cabin filter

the only other thing i can say is that the toyota specs for ac fill are not "correct" by the ac manufacturer specs, whereas you dont set the system for cooling at idle but you set it at 1500rpm