A week ago I got my compressor, and receiver/dryer/accumulator replaced and the full system recharged in my 92 LS400. Well fast forward a week and now it seems there is a leak somewhere and the A/C was blowing warm again. The thing I don't get is in the center air vents, the one on the right (passenger) side blows about 15 degrees colder than the left vent right beside it. All of the other vents seem about the same as the left vent, luke warm.

The only changes I made this weekend were swapping in a different ECU to see if it would fix my starting problem (it didn't), so I swapped back to my original ECU. Also put an aftermarket sub/amp in the car as well. Pretty sure none of this would affect the A/C but stranger things have happened....

 

The reason the drivers side is the coldest is because the a/c system with an insufficient amount of freon diverts all of what is left to keep the driver as cool as possible.

Many cars are like this.

Did someone over fill the A/c freon?

This might have caused a leak by over pressurizing the system.

 

It's actually the passenger side that is the coldest. Both drivers side vents and far passenger side are luke warm.

The car ran ice cold for exactly 1 week until I noticed it warming up. When I checked the pressure it was only 25psi, so I added about 10psi of refrigerant to bring it up to snuff and it's still not cool.

 

Just curious, what refrigerant are you using?

 

R-134a, some off the shelf version.

 

I have recharged my 97 after replacing the compressor and mine is the same. There is a noticeable difference with the pass side being colder. I just push them both left.