I have noticed that my 04 RX330 AC cold air is unstable. I had my AC temperature at 68-75 degrees and the air that output from the vent sometimes is pure cold and sometimes warm air. I never had this issue, but now it varies from mintues to minues. Any idea why this is causing it?

Thanks in advance for your help.

Is your A/C set on "auto"?? If so, that is what it's suppose to do - automatically switch from blowing cold/warm air to the temp you've set.

Split temp settings causes some of the problem and the bigger the spread between the two , the outcome is more pronounced. [Internally there is only one AC unit]

Salim

I do not have A/C set Auto. I set it manually to 70 degrees.

Then it sounds like your compressor is cycling off/on alot--It may need some freon?

i thought no cars used freon anymore just that rj45 or whatever stuff?

I believe its R134a, Freon is just a tradename that everyone uses.

could also be belt slippage.