Shudder with A/C cycles


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Shudder with A/C cycles

Postby AZRoushStang » Fri Sep 18, 2009 7:51 am

Hey everyone,

I have some "interesting" behavior with my 05 Path, that I am trying to figure out it if is normal or not.

When my A/C (the compressor) cycles, I get a quick shudder that I can feel in the car. It seems to happen *most* of the time. The shudder does vary in intensity. Sometimes it is much more noticeable than others. I can duplicate the behavior, by manually turning the A/C on/off. I feel it most when sitting at a light in Drive. I don't feel it when I am actually driving though.

I was wondering if anyone had any thoughts? Does anyone else's do the same thing? Is it normal?

I have 74,500 miles and am only 500 miles from the end of my extended warranty. I'm a little leery of taking it in and having to spend $110 for them to tell me that it is normal. So I'm hoping to get some feedback first.

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Postby mar1 » Fri Sep 18, 2009 9:09 am

wild guess here, but try tightening the wheel but where the A/C belt goes on the front side of the engine. any small imperfection in the pulley can cause a noticeable vibration.

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Postby LittleStevie » Fri Sep 18, 2009 9:13 am

I get a little bit of this shudder, but it's not bad enough for me to want to do anything about it. I just assume that it's the engine responding to the sudden increase in load and it takes a second for the ECU to increase fuel to maintain idle speed.

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Postby 2008PatherfinderS » Fri Sep 18, 2009 3:38 pm

Same happens on my 08 V6. When the clutch engages the compressor it's rather harsh. Not smooth like other vehicles I've owned.

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Postby twinblown » Fri Sep 18, 2009 6:56 pm

I mainly notice a shudder when i very first turn the AC, afterwards it almost unnoticeable. if nothing looks lose under the hood and the AC is nice and cold I wouldn't worry much about it. I do remeber seeing TSB In regard to pulley alignment.

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Postby Tech » Sat Sep 19, 2009 7:55 pm

littlestevie has it. it's normal, you may also notice at idle with the a/c on, the idle will intermittently dip. The idler alignment was for belt noise on the early 4.0L's.

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