Hi and thanks for using 2CarPros.com.
When you first start the car in the morning, the alternator has its heaviest load. If the belt is loose or in need of replacement, that can cause a squealing noise. Here is a link that discusses noises from a belt issue:
https://www.2carpros.com/articles/chirping-noise
I want you to try a little test. Since the noise lasts for about a minute, you will need to move fast or have a helper. All I want you to do is pour a small amount of water on the alternator belt when it is making the noise. If the sound changes, either the belt needs replaced or adjusted. Protect your eyes and clothing when doing this because water will most likely fling off the belt and pulleys.
If you determine that this is the problem (and I suspect it is), here are the directions specific to your vehicle for adjusting the alternator belt. All attached pictures correlate with these directions.
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Adjusting The Alternator Belt
Caution: If the belt is too loose, it will cause noise or sudden wear. If the belt is too tight, the engine coolant pump bearing or the alternator can be damaged.
1. Loosen the alternator nut "A" and the tension adjuster lock bolt "B".
2. Using the tension adjuster bolt, adjust the belt tension to the specification.
3. Tighten the adjuster lock bolt "B".
4. Tighten the alternator nut "A".
5. Check the tension or the deflection of belt, and read just if necessary.
Tightening torque
Alternator nut A: 35 - 55 Nm (350 - 550 kg.cm, 25 - 40 ft. lbs.)
Adjuster lock bolt B: 20 - 25 Nm (200 - 250 kg.cm, 14 - 18 ft. lbs.)
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Let me know if this helps or if you have other questions. Also, I honestly do not feel this has anything to do with the AC.
Take care,
Joe
Oct 19, 2018 at 8:51 PM
