A/c Unit And Wheels

[Shawn Alberti]

I decided to combine my questions into one post to save space.

I have an 06 Gs 430 that up until recently has been running flawless. Lately the car bogs down a lot. Especially when turning and then accelerating out of a turn. I always run shell or exxon 93 octane. I took it in to Lexus and they reset the computer which made it a little better. What takes away all the bogging down is shutting off the A/C. Is it possible that the compressor could be going bad and seizing up? Blows cold air just fine though? Next question is I want to put 20" wheels on. 20X10 in back and 20X9 in the front. Is there anything special that has to be done to the electronics in the car due to the different size wheel? I know the tire presssure monitors will jack up if the right size tire is on. And what offset is the best to use to avoid modifying the wheel well? Thanks in advance for your help