2008 Cooper S problem

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I have just been out in my 2008 MINI cooper Clubman S and it seems to have developed a problem on my journey to the in-laws. I give it a bit of welley up a small hill and it seemed flat like it had lost a bit of boost from the turbo (still pulls but not as hard it usually dose. I nursed it the 5 miles to get to my destination and noticed the rad fan was going and its also popping alot more frequent than normal. Also the heater has stopped blowing hot air.

Its under warrenty so it not too much of a problem.

Any ideas.

Adam

P.S. I cant see any boost pipes split or come off and it is'nt making any wooshing noises.

I have posted on total mini aswel but thought I would try here aswel.

[DanGT]

What is the water level like? Also check oil as a=they can use a lot.

[Nigel H]

Not exactly the same symptoms, but just had something similar. New stat fitted

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A MINI tech guy came out yesterday and replaced the temp sensor under warranty and all seems fine now so I'm happy.

Adam