Hi gys,I have rx330 04,i notised grinding noise that lasts few seconds in the engine compartment after putting ac on.is that normal for rx

 

Definitely not normal, this could be an early warning of more significant problems to come. There are many potential sources of such noise - but you will have to reproduce the conditions that created it. Open the hood, remove the engine "trim panels", and listen as the engine is started. You may find a loose belt, or something relatively simple is causing the noise.

With the engine cold, have someone crank the engine and turn on the AC (if not already on). Watch the sightglass on the freon line to see if you can see any bubbles. These indicate a low freon charge and can produce a rumbling/roaring sound as they pass through the compressor. Once well distributed in the refrigerant, the noise ceases.

Have your AC system checked by either your dealer, or (maybe cheaper) a good AC shop. If the diagnosis indicates an expensive repair, get a second opinion before proceeding.