Question about 1991 Nissan 300ZX

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What is causing my squealing belt?

I have a 1991 Nissan 300ZX that has a squealing belt. A/C, Alternator and Serpentine belts have been replaced. It squeals for a few minutes at start up, then quiets. It also squeals when running the A/C. Any ideas?

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  • 14 Answers

I would check belt tension and then Idler pulley bearing..If still nothing check the A/C compressor clutch..

Posted on Jul 19, 2014

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Posted on Jan 02, 2017

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Greg Bernett

  • 2989 Answers

SOURCE: I need to adjust my fan belts on a Nissan 1991 300ZX Turbo.

Try spraying one item at a time with WD-40 or belt dressing. Try not to worry about doing the belt first and save it for last. Most causes of squeals are galzed belts from being too tight or the pulleys of whatever item, the bearings are going out or were improperly lubed.

This is the cheapest method to truoble shoot the annyoing noises.

Hope this helps!

Posted on Mar 13, 2009

littlcinder

Cindi Kinch

  • 22 Answers

SOURCE: need to replace the alternator belt for 87 nissan 300zx

there is a small pully on the top belt that has a long bolt on top loosen left turn and the pulley will go down . the alt .has 1bolt to pivit and a nut to tighten an hold .you will see when you look under car.

Posted on May 17, 2010

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Year make and model ??
The belt could be glazed and slipping even if it is tight.
You could have a weak belt tensioner too.
The noise when the ac or heat is turned on can be the extra load from the ac compressor or the alternator. The compressor cycles on and off especially in defrost mode.
The load from the alternator is the first noise of the day. As the belt warms up it becomes better at handling the load of the accessories.
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The fan clutch or belt to it, is making a screeching noise and then stops after a few minutes. We've tried everything to get it to stop. What lshould we do?


The bearings in the fan clutch, or idler pulley may be going out, which would create extra resistance. This would cause the belt to squeal until everything is moving like it should. Try to lube the bearings, and put some belt stop squeal spray on the belt ridges. If this doesn't help, take the belt off and find which pulley is causing the extra resistance.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

Jul 13, 2010 | 1990 Nissan 300ZX

1 Answer

I need to adjust my fan belts on a Nissan 1991 300ZX Turbo.


Try spraying one item at a time with WD-40 or belt dressing. Try not to worry about doing the belt first and save it for last. Most causes of squeals are galzed belts from being too tight or the pulleys of whatever item, the bearings are going out or were improperly lubed.

This is the cheapest method to truoble shoot the annyoing noises.

Hope this helps!

Mar 13, 2009 | 1990 Nissan 300ZX

2 Answers

Loud squealing noise


The noise is most likely the serpentine belt. Check it's condition and that of the belt tensioner. It sounds like the belt is slipping, causing the squealing noise u describe. As the belt warms up, it's getting a better 'grip' and the noise stops. Turning on the heat also turns on the a/c in newer cars, this added drag on the belt (one more component to turn, the a/c compressor) would explain why it happens when u turn on the heat. Is the belt original? If yes, it's time to change it, and check the belt tensioner to make sure it's doing it's job of keeping the belt snug on all the pulleys. Let me know how u make out.

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