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Robert, UK Qualified Car Technician
Category: Audi
Satisfied Customers: 4716
Experience:  Fully qualified 19+yrs exp/self employed technician in the UK
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I am the owner of a audi a1 1.6tdi, when I turn on my air

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I am the owner of a audi a1 1.6tdi, when I turn on my air condition; a knocking sound is coming from engine also it sounds like if the engine is under load


Could be sypmtoms of bad A/C compressor or the actually clutch pulley on the compressor..its run off the auxillary belt so once the a/c is turned on then this engages the clutch pulley to run the compressor..if the compressor is partically siezed or faulty then it can cause greater load on the belt and engine...its certainly the first area of checks you'll need to have done....

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