idles rough with air conditioner on

2010 FORD FOCUS
120,000 MILES • 1.6L • TURBO • 2WD • MANUAL
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CRAIG GILROY
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When I do not use the air conditioner at all, the car seems to run smooth. When I arrive and switch off, the car jolts and sometimes the fan is left running for a minute after the car is switched off. I have had the cam-belt, engine mounts and clutch replaced. I think it could maybe be the compressor or even the fan belt, as I do not believe its been replaced.
Jul 21, 2016 at 1:37 AM
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HMAC300
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belt and tensioner recommended replacement is 60,000 miles. try cleaning throttle plate on both sides and IAC hole with choke cleaner for other problem . fan should run if car is hot.
Jul 21, 2016 at 5:55 AM
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CRAIG GILROY
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Thank you for the advise. Sorry, I am not a mechanic, so I have little knowledge on all the terminology. Are you referring to the serpentine belt?
Jul 21, 2016 at 6:07 AM
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HMAC300
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yes, or a fan belt as you know it tensioner too. auto parts can show you.
Jul 21, 2016 at 9:37 AM
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CRAIG GILROY
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Thank you, that is really helpful. Is it worth mentioning the car seems to lose power when accelerating up hill? Last few days a slipping feeling has come, like the belt is slipping the pulleys? The squealing noise has not started yet, but assuming it is the fan belt, that will come next. This seems to all happen when the engine is hot and the cooling fan kicks in.
Jul 21, 2016 at 10:15 AM
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HMAC300
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
it may effect the air conditioner, but as far as losing power If you scan for codes and check fuel pressure with a gauge that may be more of a problem not so much the belt unless your battery is really in poor shape and the alternator is slipping from a poor fan belt. auto parts rent the gauge.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Jul 21, 2016 at 10:39 AM
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