Ford Focus Forum, Ford Focus ST Forum - View Single Post - Rough Idle only when the A/C is on
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Old 11-17-2012, 09:32 PM   #7
bumble21
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Join Date: Mar 2012
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Location: Boston, MA
What I Drive: 2001, Black&Yellow, ZX3

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Is the idle bouncing? I could be a bad bearing or ac clutch in the compressor. Turn the car on and turn the ac on. Pop the hood and look at the serp belt. The pulley at the bottom is the ac pulley. If its a bouncing idle you should see the pulley freeze momentarily and then kick back on I have this in my car. Good luck, I suggest exhausting every possibility for diag before throwing the parts dart and buying tons of stuff that you don't need to replace
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