Rushblaster Posted May 14, 2015 Report Share Posted May 14, 2015 has been happening for weeks now. Just got alternator replaced and water pump replaced with belt nd tensioner. Also sometimes starts back up while driving around 1350 rpms for a second and stops when i let off the gas. Any help would be appreciated!https://youtu.be/bHDs6IMepEU Link to comment Share on other sites More sharing options...
Cadillac Jim Posted May 14, 2015 Report Share Posted May 14, 2015 It sounds VERY much like a slipping belt. That much noise would make the serpentine belt worth looking at, event though the water pump work makes that belt the first suspect. But don't let this go any longer than you must. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
navion Posted May 14, 2015 Report Share Posted May 14, 2015 Possibly a power steering pump going bad, or just low on fluid. Britt Link to comment Share on other sites More sharing options...
winterset Posted May 15, 2015 Report Share Posted May 15, 2015 Call me crazy but it sounds all normal to me. If there is a noise that my ears cannot here, try spraying each of the belts separately with soapy water. If one of tue belts or a component is causing the noise, it will at at least change pitch, and at most stop altogether. I know it's only the water pump side of everything else, but at least it will narrow it down to something driven by a belt. Link to comment Share on other sites More sharing options...
airmike Posted May 15, 2015 Report Share Posted May 15, 2015 If the belt is not new, maybe it got put on facing the other direction from previous. I have seen this cause squealing. Link to comment Share on other sites More sharing options...
barczy01 Posted May 15, 2015 Report Share Posted May 15, 2015 Well beyond the noisy air pump its hard to hear anything. Link to comment Share on other sites More sharing options...
Logan Posted May 15, 2015 Report Share Posted May 15, 2015 Sounds like a horrific air pump issue to me. It sounds like the noise turns off toward the end. Right about the time the air pump would be turning off. The air pump is well hidden in the front lower area of the drivers side front fender.....behind the bumper fog lamp area. Not obvious unless you know it's there. You cannot see it with the hood open. The air pump will mostly only work on cold start ups. So you may not hear it at every start up. The air pump relay is on the passenger side strut tower. All by itself on a bracket near the coolant tank. You can jump the air pump motor there for testing. Logan Diagnostic LLC www.airbagcrash.com www.ledfix.com www.ledfix.com/yukontaillightrepair.html www.ledfix.com/ledreplacements.html www.ledfix.com/j42385toolrental.html Link to comment Share on other sites More sharing options...
Cadillac Jim Posted May 15, 2015 Report Share Posted May 15, 2015 I didn't listen to the video before my first post. This is a whine, not a screech, like a turbine or a resonance on a turbine, pulley or shaft. It stops after a few seconds, so the time it is "on" is consistent with the A.I.R pump running until the car goes closed loop. I share Logan's opinion. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
cdgrinci Posted May 16, 2015 Report Share Posted May 16, 2015 Also agree the sound is a whine; could be airpump. Have you checked for proper belt positioning and routing; almost sounds as if something is running backwards. It also seemed to dissipate after coming off fast-idle; will revving the engine induce the whine again? Chuck '25 CT5, '04 Bravada........but still lusting for that '69 Z-28 Link to comment Share on other sites More sharing options...
Cadillac Jim Posted May 17, 2015 Report Share Posted May 17, 2015 Pull the air pump fuse and see if that stops it. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
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