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Linas.P posted a topic in Lexus IS 250 / Lexus IS 250C Club / Lexus IS 220D & IS 200D ClubHello All, My car just developed interesting fault. Surely expensive to fix, but interesting in a way to investigate and nail the real cause. So to start with - few days ago (like Tuesday this week) my A/C started making some noise ... like squeakyish/grinding noise, but it was intermittent (happened like 2-3 times altogether). I had a service coming up 2 days later so didn't really bothered to investigate, nor had an opportunity. Thought, "if there was something obvious Lexus service will pick it up" and if not I will take a look over weekend. So Lexus Woodford did service an MOT, got all green except one amber. They said my drilled rotors are far too lavish, hence they put amber to accompany them (to clarify it is amber for "non-genuine front rotors and pads", they are Mintex drilled discs with Brembo OE-equivalent low dust pads - will post new thread in Modifications forum). The rest are all green including "Aircon / heating / ventilation" as below: On my way home from the dealer, I have realised my windows are starting to steam-up and the air from A/C is getting hot... clicked on "Windows Defogging" and the realised that A/C light is flashing > stopped by traffic lights and clicked "Off" and "Windows Defogging" again to restart A/C. This resulted in the weirdest thing ever in any car I have owned > the engine RPM started jumping and when I have clicked on "Off" again the engine cut-off as well (see video below). You can notice A/C light is solid while RPM is jumping. From under the bonnet it looks like compressor clutch tries to engage unsuccessfully or that compressor is actually completely stuck. Actually, I can see little sparks coming out of the pulley (see video below - sorry it is bit dirty ... Lexus panels does great job keeping all that dirt and rust inside). It only happens on idle, if I am cruising at speed then A/C light starts flashing straight away. Now based on the fault description I have found that this fault can be caused by faulty compressor clutch coil. I do believe this is not the case, because faulty coil would result in flashing A/C light and as well would fail to engage compressor, but in my case it seems it is trying to engage compressor and after multiple failures gives up and starts flashing. If I drive at speed trying to turn A/C results in flashing A/C light straight away - no impact to RPM etc. So my second guess would be that compressor itself is mechanically faulty/stuck and engaging clutch causes stress to the belt and RPM starts dropping. This would be sad news.. as replacing compressor would cost 10x more than just replacing coil. Any other thoughts? As well wouldn't you expect Lexus dealer to pick up such faults? I am not joking .. it happened 3,5 miles away from dealer after “All Green verdict”... Any help or opinion would be greatly appreciated, thanks