I appreciate all the explanations. I am curious about the cross charged TXV and skimmed through the patents you mentioned but they are extremely verbose and hard to read. For discussions sake the vehicle in question is a 1999 Lexus LS400. The AC sllooowwwly cools down when the vehicle is heat soaked...

I didnt really want to turn this thread into a diagnosis thread which is why most information was left out. The system is in good working order, and isnt troublesome, its merely not as good as I want it to be. In fact when I park in the shade on a 115 degree day or drive the car for 15 minutes, the ...

The main reason I ask is I have another vehicle that despite the same conditions will pump down the vent temperature almost instantaneously - like within 60 seconds the air out the vents will be very cold, even when the interior temperature is upwards of 150 degrees. The main thing I want to know is...

I am curious what happens to system conditions when the heat load on the system exceeds the design of the system? My system is in good working order regarding charge, condenser airflow etc. but still doesn't get as cold as I would LIKE it to when I am in the middle of a hot summer day in Arizona, ju...

All good points, thanks for the tips. I may invest in some good electric aux fans one of these days but for now I will just take off after starting up the AC.

I have a 1999 Lexus LS400 w/ viscous cooling fan and 1 factory electric pusher fan on the condenser. I have just replaced the viscous coupling so I know that it is working properly. I live in Pheonix where daily ambient are approximately 105-110 right now. My car sits in the sun all day at work and ...