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Old 06-06-2018, 11:08 AM   #1
Jeffbass
 
Drives: 2010 Yaris
Join Date: Apr 2016
Location: Portsmouth va
Posts: 4
Weird noise at idle with ac on

So I know these cars can have a motor tick to them but my car has a nasty tick noise and itís coming from something belt driven I think cause it pronounced near that side of the car . It seems like it only happens when the car is warm and the ac is on. I have used a screw driver to listen to each component and canít really tell. The ac pulley has the slightest movement I mean itís very little and with the screw driver on it it sounds fine the water pump maybe the culprit but itís hard to say I think itís the water pump or the alternator but why would that be the case if it only happens with the ac on. By the way this is all at idle. I did notice that when I turn my ac on the engine fan immediately turns on but noise is near the belts . Any ideas would be appreciated. Thanks
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Old 07-31-2018, 07:59 PM   #2
ricardo-cr23
 
Drives: Toyota Yaris 2007 1.5L V4
Join Date: Jul 2018
Location: Costa Rica
Posts: 10
I need help with this, I have the same symptom, and it looks like it is not related to the AC, because it happens with only turning on the heater, it does not matter if the AC is on or off.

If you were able to find the root cause, please tell me!!

Cheers!
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Old 08-01-2018, 07:11 AM   #3
ex-x-fire
 
Drives: 2010 yaris 3 door hatch
Join Date: Jun 2013
Location: Sheboygan Falls, Wi.
Posts: 214
Pull off the drive belt and see if the noise is still there.
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Old 08-01-2018, 08:34 AM   #4
dogsridewith
 
Drives: 2007 2-door hatchback
Join Date: Jul 2016
Location: USAnotCA
Posts: 555
A/C compressor-on drive torque tightens belt and increases bearing loads in upstream belt driven components.
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Old 08-01-2018, 09:52 PM   #5
ricardo-cr23
 
Drives: Toyota Yaris 2007 1.5L V4
Join Date: Jul 2018
Location: Costa Rica
Posts: 10
I'll give it a try and let you know.
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