Hi Paul,What year is the car? Do you know which automatic gearbox is fitted? How many miles/kilometres has it covered?
Car: 2015 plate
A-Gearbox: Aisin Warner EAT6 - T9F 2 22B 50A - Oil: 9734 R7 (JWS 3324)
Car's mileage: 61000 miles (ca. 98,170 km)
2015 2.0 Blue HDi 150 Peugeot 308 Allure SW
Hi,What kind of noise? How loud? You can hear it only while accelerate in first or second gear? Try with A/C off. Compressor can be the source, but this is not necessary sign of any fault.
Hi,Take off the aux drive belt and see if the noise goes....sounds more like alternator/aircon pump..could also be water pump but that will be hard to test
Hi,I believe this is a turbocharged engine so could it be turbo-whine? If it is a developing turbo problem then get it looked at immediately. A common problem is that the oil feed and return pipes to/from the turbo become blocked-up with carbonised oil. This happens when engines are switched off immediately after the engine has been worked hard without allowing the turbo to cool down slowly and the oil 'cooks' in the feed and return pipes. This starves the turbo of lubricating oil and causes turbo failure. It is much cheaper to get the pipes changed before this happens.