A/C Noise From Engine in Ford Fiesta

Do you idle the car for a minute after you start it?If not, try that.

Let the engine get warm enough before you turn on the air conditioner.That way there won't be any noticeable power drops.

Keep an eye on the temperature needle when the power drop happens.See if the engine overheats.If so, then you need to service the radiator fan and flush the radiator.

Use a fuel system cleaner with the fuel.This will help clean out the fuel lines and help improve performance.Try cyclo or 3M fuel system cleaners.

Next thing to check is the condition of the clutch, since you are a new driver you need to check the clutch.If it is worn out you should change it.That will also lead to a sluggish car.

Source: http://www.theautomotiveindia.com/forums/technical-zone/13417-c-noise-engine-ford-fiesta.html

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