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Ac on dying out

Old 06-15-2018, 07:07 PM
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Ac on dying out

Hello got a 2007 2.2 when I have the ac on and slow down to stop the car will die out .. have to restart all is fine .. I have clean the throttle body maf sensor , new air filter so I’m wondering if it is vapor lock ? When ac off it does not do it so just wondering if it got something to do with Ivac ? Also no check engine light on at all ..
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Old 06-15-2018, 08:41 PM
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Sounds like the A/C compressor is dying.
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Old 06-16-2018, 08:36 AM
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X2, any CEL light?
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Old 06-17-2018, 01:58 AM
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Originally Posted by Oldblue
X2, any CEL light?
once in awhile I get a knock sensor code but if I turn the air off it will not surge at all .. it only does it when coming to a stop it will surge and come back to regular idle .. only with the air on ..
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Old 06-17-2018, 06:47 AM
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Double check the serpentine belt and tensioner pulley
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Old 06-17-2018, 08:57 AM
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I see I need to explain.

The A/C compressor has bearings. The bearings wear out and bind. When the engine speed is high it can overcome the resistance, when it is low the compressor acts as a brake.

When you turn the A/C off the clutch is freewheeling, so the bearing is not turning.
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Old 06-17-2018, 10:42 AM
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I will say I had a Cat 4116 mechanic engine in a truck that was towed into the shop and it was said the engine was seized. And yes you could not bar the engine over, one way or the other.
The tensioner was seized for the serpentine belt and that was the total problem.
It amazed me that the belt could stop the engine when the tensioner was bad.
So is the tensioner starting to go bad on his engine?
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Old 06-17-2018, 11:44 AM
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Only when the A/C is on? Kind of narrows the fault down, don'tcha think?

Harmonic balancer, alternator, tensioner, torque converter and A/C compressor. Those are the choices.
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Old 06-17-2018, 12:03 PM
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Originally Posted by donbrew
Only when the A/C is on? Kind of narrows the fault down, don'tcha think?

Harmonic balancer, alternator, tensioner, torque converter and A/C compressor. Those are the choices.
I'm leaning towards the compressor or tensioner now. Can't see how harmonic balancer or alternator could be an issue.
Bad torque converter (if it's "locked" up) would drag the engine down all the time, a.k.a. no acceleration.
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Old 06-17-2018, 12:31 PM
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So, we’re down to compressor, and possibly tensioner and serpentine belt.
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