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Thank you all for the replies. It is louder than what you can hear on the recording but for some reason it doesn't pick up well on my phone. The garage who told me its the suspension is actually a German specialist garage who I've used a few times. They are pretty good I'd say. But yeah I think I'm going to get my brother to take it to the Audi specialist. Fingers crossed they are able to figure it out and its not too expensive 😕

Hi, some cooling system designs have a single outlet from the expansion tank and on these the tank takes a while to get warm because there isn't any flow of warm coolant through it. Other designs have more than one pipe connected to the tank. For example some have a small pipe from near the top of the radiator that connects to the expansion tank so that any air in the radiator will bleed out automatically. So just check how many pipes are connected to the tank - if there's only one connection the tank will tend to stay cool, although it will get warm eventually due to conduction. Regards Clive

That's as good a guess as mine Gareth. It could be almost anything from the jack bouncing around the boot to a door not latched properly. I have to say the previous diagnoses of wheels too big or dry suspension are sheer fantasy without other supporting evidence, which would be very visible and unmissable to a mechanic who knew what he was doing. Zara. You need to get the car looked at, preferably by someone who has been recommended by someone you know and trust. Be aware, if you are not already, that some garages will try to take advantage of women who have no knowledge of cars and tell them any old rubbish to defraud them. That applies to both big and small businesses so try for a personal recommendation, not an internet review site.