2009 RX 350 AC Problem - Compressor cut off

[vijith555]

Hi everyone,

I have a 2009 RX 350 that has developed a problem recently. So to try and make this short the problem is with the air conditioner. On a hot day say when it is over 35C or 40C the air conditioner starts to work fine and maybe about 5-10 minutes later starts to blow hot air. So what is happening is the compressor cuts out. But when you browse to the AC menu on screen it still has green lit up on AC. So what i do is toggle that screen AC switch off and on again and this brings the compressor back to action and cools like no problem. And the crazy thing is it continues to run fine throughout the journey without turning off again. It puzzles me why this happens? Mostly happens if the car was sitting out in hot sun before I got in. On days that are 35C+ if I drove out of my garage the air compressor will not stop but continue normally. On days less hotter this never happens. 

Any ideas or areas to check? Would be much appreciated. 

Thank you. 

[JustChuck]

Same problem on my ‘14. Did you ever find a solution? 

[PONIE111]

G'day Mate. Take your Lexus for a software update...often sorts the issue. If not get an OBD2 reader/scanner on Amazon AU (BlueDriver Bluetooth Pro OBD2 Car Scan Tool and Code Reader - Check Engine Light Vehicle Scanner for iPhone & Android : Amazon.com.au: Automotive) and download the app on your mobile phone. Turn the ignition on and plug it in the car's OBD-port (under dashboard by the steering collum). Pull up the app and once connected, do a full scan while the car's running (takes a couple of minutes). If you get a B1475 fault code, chances are it's the AC amplifier. If not...the amplifier is still where the problem most likely originates. The unit (black box with wires/connectors hanging off it) sits right above the cabin air filter box (in the dash). It's a prick of a thing to get to and if (like me) you're not that handy with pulling dashboards apart and lack the right tools to get into it, get a car-nut to do it for you.

Both Toyota & Lexus know they have a problem with their AC Amplifier units. Hope this helps!!

[luxery]

Sounds like your AC compressor might be overheating or the relay is acting up. Since it works fine after a reset, you could check the AC clutch relay or temperature sensor. Anyone else experienced this on a hot day?

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