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Old June 3rd, 2016, 05:56 PM   #1
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AC "chunk" problem

When I have the car running at any rpm on INITIAL AC application (turning the button on). I hear a loud "chunk" sound that is also able to be felt through the steering wheel/pedals. It's clearly coming from the compressor and likely has to do w the clutch...almost feels the same as frozen brake calipers after a car wash when you break them free for the first time. Any other time I turn AC on/off after the initial "chunk" is no problem, it feels normal to me.

I'd wager it gonna be a compressor replacement but want to know if anyone else has had this symptom.
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Old July 5th, 2016, 07:15 PM   #2
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Not at all
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Old July 5th, 2016, 07:18 PM   #3
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Yup I hear the clunk all the time. It is the compressor clutch kicking in.
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Old July 9th, 2016, 08:04 AM   #4
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Check your crank pulley, had that happening with my first (4th gen) Accord, the rubber separating the outer ring (which was the one for the compressor) was failing. It is there to cushion the on/off of the compressor. Had it completely fail in the crappy Mazda 626 I used to have and the outer ring separated from the rubber in the crank pulley.
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Old July 11th, 2016, 08:59 AM   #5
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I'm swapping the crank pulley for a lightweight unit on the new engine so hopefully I can hold off till then...it def does not feel like a normal condition...esp because my wife's i4 has never done it.
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Old July 13th, 2016, 10:08 AM   #6
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Don't know if you sorted this out yet but I would check 2 things. It could be the compressor is low on oil and the initial dry start is causing the clunk, especially if it goes away after you cycle it. The other is the easy check, get under your car and make sure the mounting bolts and pulley bolts are all torqued down properly. They all clunk when they start up (in my experience). My mothers CR-V does, my stepfathers 14 Accord V6 Touring does and mine does it to. I have a brand new compressor in mine also. Good luck, now back to chasing my own gremlins -_-
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