Hi,
Is the belt tight? Is there anything getting on it such as coolant or oil?
If I understand, it makes noise and then stops and is worse with the AC on. When you have the belt removed, are any of the belt-driven accessories seem hard to turn?
Here is information for testing the belt auto-tensioner. I realize you replaced it, but confirm it is working properly. The attached pic correlates with the directions.
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2006 Mazda 6 L4-2.3L
Drive Belt Auto Tensioner Inspection
Vehicle Engine, Cooling and Exhaust Engine Drive Belts, Mounts, Brackets and Accessories Drive Belt Tensioner Testing and Inspection Component Tests and General Diagnostics Drive Belt Auto Tensioner Inspection
DRIVE BELT AUTO TENSIONER INSPECTION
DRIVE BELT AUTO TENSIONER INSPECTION
1. Remove the drive belt.
Pic 1
2. Verify that the drive belt auto tensioner moves smoothly in the operational direction.
- Replace the drive belt auto tensioner if necessary.
3. Turn the drive belt auto-tensioner pulley by hand and verify that it rotates smoothly.
- Replace the drive belt auto tensioner if necessary.
4. Install the drive belt.
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If possible, record what it is doing so I can hear and see it. That will help me.
Take care,
Joe
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Thursday, December 17th, 2020 AT 8:50 PM