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Evo X Transmission & S-AWC System Discussion for transmission, axle, driveshaft, and related systems that are unique to the Evo X. IF THE TOPIC IS COMMON WITH OTHER LANCERS, PLEASE POST IT IN: '08+ Lancer Common.

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Old 01-24-2019, 09:16 PM   #1
Apex_evo
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Buzzing noise from trunk

ACD/AYC pump has been relocated into the trunk by previous owner and car has 27,000 miles, Works correctly with no warning lights on. System was bled by dealer and seems to be working fine. Except there is this buzzing noise from the trunk when im around 3k rpms, and go into some boost and the bar graph shows the ACD working. Im assuming its coming from the pump in the trunk. Fluid level is normal. Found a video on youtube someone posted with the same noise so here is the link. Let me know what you guys think. https://youtu.be/_WmFeyOexpA
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Old 01-24-2019, 11:53 PM   #2
CanEvo2012
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That's bubbles in the system. I had that. Required some bleeding. But after a few bleeds they discovered the seal was bad and fluid would leak and/o sip in air into the system. It was after the extended warranty work for my pump.
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Old 01-25-2019, 04:19 PM   #3
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Originally Posted by CanEvo2012 View Post
That's bubbles in the system. I had that. Required some bleeding. But after a few bleeds they discovered the seal was bad and fluid would leak and/o sip in air into the system. It was after the extended warranty work for my pump.
Hmmmm, I had clutch work done and it led to air in my pump which threw the AWC light to blink. Had it bled for $200 cost and it works fine with no lights. But it still needs to be bled?? Annoying, how should I approach the dealer do you think? So I don’t have to pay another $200 to be bled with the MUT3 tool or whatever it’s called.
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Old 01-25-2019, 04:57 PM   #4
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Just approach it like that, they bled it and its buzzing. They should make sure it's bled properly. Especially for $200. My clutch place did the bleeding themselves.

I didn't have any light when mine was buzzing. Make sure there is no leaks in the system.
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