Mystery noises in engine bay

[OR VietVet]

With 105 amp alternator: https://www.rockauto.com/en/moreinfo.php?pk=5614311&cc=1371585&pt=10660&jsn=1094&jsn=1094

With 130 amp alternator: https://www.rockauto.com/en/moreinfo.php?pk=5614317&cc=1371585&pt=10660&jsn=1095

Unfortunately, I did not see AC Delco or Genuine GM fan clutch listed at RA.

Post your last 8 digits of your VIN and then @915_Tahoe can give us the GM part number and then can post that at RA and see if they have a Genuine GM fan clutch or an AC Delco fan clutch. I have looked up parts before by application and saw no GM parts listed and then did a search at RA with a GM part # and then it pops up at RA.

 

[Fless]

With 105 amp alternator: https://www.rockauto.com/en/moreinfo.php?pk=5614311&cc=1371585&pt=10660&jsn=1094&jsn=1094

With 130 amp alternator: https://www.rockauto.com/en/moreinfo.php?pk=5614317&cc=1371585&pt=10660&jsn=1095

Unfortunately, I did not see AC Delco or Genuine GM fan clutch listed at RA.

Post your last 8 digits of your VIN and then @915_Tahoe can give us the GM part number and then can post that at RA and see if they have a Genuine GM fan clutch or an AC Delco fan clutch. I have looked up parts before by application and saw no GM parts listed and then did a search at RA with a GM part # and then it pops up at RA.

Based on the alternator pic in the video, it will be the 130a or 145a alternator. The 105a doesn't have the wide dark center part of the case. The alternator should have the amp rating stamped into the case.

 

[Wing Bucket]

The alternator is 130a....

Regarding the fan clutch, I believe this is it: https://www.rockauto.com/en/partsearch/?partnum=154694

I’ll message 915_Tahoe to request some lookup assistance. Thanks!

 

[OR VietVet]

The alternator is 130a....

Regarding the fan clutch, I believe this is it: https://www.rockauto.com/en/partsearch/?partnum=154694

I’ll message 915_Tahoe to request some lookup assistance. Thanks!

Great. When you want his attention on the thread then put the @ in front of his screen name and in PM you do not need that @ when typing in who you are messaging.

Likely is the correct fan clutch but @915_Tahoe can verify for sure.

 

[OR VietVet]

The alternator is 130a....

Regarding the fan clutch, I believe this is it: https://www.rockauto.com/en/partsearch/?partnum=154694

I’ll message 915_Tahoe to request some lookup assistance. Thanks!

That fan clutch is $113.79 at RA plus shipping and $106.95 at Amazon and free shipping

That belt and tensioner/idler kit ACK060930 at RA is $67.99 plus shipping and is $76.98 at Amazon and free shipping

$2.15 more at Amazon with free shipping.

 

[SnowDrifter]

When doing the fan clutch, try to use OE if available. We hear stories about aftermarket fans that tend to roar. Also inspect fan blades for cracks.

The fan clutch threads should be right-hand style, so remove in the usual counter clockwise direction.

If you change the water pump, buy one with the thermostat and housing as a set. Sometimes the pumps are different and the old thermostat housing doesn't fit the new pump.

For the water pump: Get OEM. At least on the thermostat side. I actually just replaced mine because it was being dumb. It worked, technically, but big temp swings. Never showed on the gauge FWIW - only saw on a digital readout

 

[robhotdog]

Thanks, I’ll be replacing the fan clutch and tensioner/pulley. But will have to stop there for now! Haha

Run it with the fan off th pulley. Belts on..also remember there's a second belt behind the main..AC only..take it off and reinstall the main...it might be a compressor bearing.

 

[RET423]

I would suggest also changing the A/C idler pulley and tensioner as well, it seems like they all go about the same amount of time.

 

[Wing Bucket]

Thanks for the tips everyone. Today I took off the fan/clutch. There are still two noises occurring.... If you have any ideas let me know!

There’s a bearing/squeal/chatter noise, which appears to be coming from the alternator. If I press the rubber boot on the output cable, it quiets. Here’s the video:

Then there’s the whirring/clicking noise that occurs after the key is turned off. Sounds like it’s coming from behind the throttle body. Here’s a better video:

Thanks

 

[OR VietVet]

I would say both noises are from the alternator. Obvious alternator problem. Replace it and see if the noises both go away. The alternator is right there in the second video.