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CTS
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Discussion Starter #1
I have a 2005 Cadillac CTS 3.6L and I am getting a hollow rattling noise when I accelerate to 1k RPM and then to 2k RPM, but it subsides after that, while steadily driving. Possibly the AC Compressor is going? Would it be something else? If i were to replace the AC Compressor Relay, would that solve the noise problem without having to replace the compressor?
 

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2006 Cadillac CTS
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16 Posts
Have you checked your oil lately? I experienced something similar earlier this week. Was due for an oil change anyway, so I thought I would give that a try. Went and got the oil changed, no more rattle.
 

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07' CTS-V | 07' Lux 3.6 Volant-Borla-Vsways | 08' CTS 3.6 DI Performance
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969 Posts
I'm experiencing a similar rattle, after I got under my car it turned out to be my exhaust resonator it has a loose weld inside. I got a replacement resonator from ebay it's a walker brand, I have yet to weld it on been busy lately, but you will know for sure if you go under the car and hit the resonator a bit with a big metal objec and listen for a rattle.
 
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