986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Does this rumbling noise sound like the idler pulleys?

997_986 · 09-14-2025, 08:55 PM

I also think it is one of the bearings of one of the pulleys. Take the opportunity to renew the belt as well. If the AC compressor might be the culprit, switch it on and off and check the difference -- if there is any.

09-14-2025, 08:55 PM	#7
997_986 Registered User Join Date: Jul 2024 Location: Western Europe Posts: 242	I also think it is one of the bearings of one of the pulleys. Take the opportunity to renew the belt as well. If the AC compressor might be the culprit, switch it on and off and check the difference -- if there is any.