LukeG Posted September 9, 2008 Share Posted September 9, 2008 I've done a ton of searching on here and Google and haven't been able to find anything on this problem even though from what I am told it is pretty common. I added a few words I was searching for in the title just to make it easier for anyone looking for info on this problem to find the thread. The car is a 94 LS400 and the AC is making a knocking/thumping sound. The colder I make the AC, the worse it gets (faster thumping). I can get it to go away if I make the AC pretty warm or I turn it off, but it is hot as hell here and I need the cold AC. A friend said it was some sort of actuator causing the noise and I've heard they are pretty pricey to replace because of the labor involved. I was hoping to get a bit more info if anyone is familiar with this problem and at least get a better idea of what parts need to be replaced and how much of a pain in the butt it is to do. The repetitive thumping is going to drive me crazy. Any help is greatly appreciated. Quote Link to comment Share on other sites More sharing options...
Blayd Posted September 9, 2008 Share Posted September 9, 2008 When my AC got noisy it was because the compressor was worn out and I had to get a new one. $300 total fixed the problem for me. about $200 for a used comp off of ebay and about $100 to have it installed. Quote Link to comment Share on other sites More sharing options...
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