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Discussion Starter #1
After reading various threads on here I realised that my M5 was running cool and more than likely had a stuck open thermostat.
Only had the car just over a month and couldn't see it mentioned on the warranty that the dealer (none BMW) gave with the car.

Oh well I thought it is the kind of thing you have to budget for.

Cotswold BMW (Cheltenham) quoted £365 inc VAT and a local BMW specialist qouted £312 inc VAT.

Just about to book it in with the specialist when I thought I might as well chance my arm with the dealer I bought it from.
Anyway they have agreed to do it under warranty, thermostat, housing, O rings and mounting ring!

What a result! (hopefully as long as it is done OK)

Racecourse cars in Bishop's Cleeve near Cheltenham. Can't reccomend them enough, superb service! (replaced parking sensor under warranty to)
 

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Cotswold BMW (Cheltenham) quoted £365 inc VAT and a local BMW specialist qouted £312 inc VAT.
Holy sh't! My local indy changed mine for around £150 inc Vat last year! Glad you got that done under warranty, I couldn't face telling you after you paid that!
 

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This is not that hard of a DIY project. You are getting it under warranty but in the future, this is something you can do yourself.
 

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i paid bmw to do mine at £325 and they messed it up 2 times,lots of aggravation and hassle
i am not able to do my own work and dont know anyone local that i trust..glad your sorted
 

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i paid bmw to do mine at £325 and they messed it up 2 times,lots of aggravation and hassle
i am not able to do my own work and dont know anyone local that i trust..glad your sorted

Just curious...what was wrong? Leaks? I think the problems come when you try to do it without taking off the plenum and vanos lines. Yeah, it adds an hour to the job but makes reinstall so much easier. Really hard to mess it up when those are removed. It also allows the tech or DIY to visualize other potential PM issues like cracked wire looms, leaking lower oil separator hoses, etc.
 

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i had the temp go to max issue ,they replaced the thermostat and a few miles up the road coolant light came on
topped her up at home and checked top hose pressure,a few hours later top hose was soft and bottle went down an inch
i topped it again then spotted water in the tray,they recovered it as i wouldn't drive it,2 days later picked it up ,all was good
next day coolant light on again ,after a fuss they gave me a poxy mini till it was redone..at a reputable BMW dealer.
 

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Discussion Starter #7
All done under warranty.

Now getting a constant 79/80 degrees C on the short journeys I have done today (5miles only) needle is just slightly left of centre.
Ambient temp is 4 degrees C

Before the replacement I was only getting 69/70 degrees C with needle on the first dot.

will be able to give it a good blast tonight!
 

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All done under warranty.

Now getting a constant 79/80 degrees C on the short journeys I have done today (5miles only) needle is just slightly left of centre.
Ambient temp is 4 degrees C

Before the replacement I was only getting 69/70 degrees C with needle on the first dot.

will be able to give it a good blast tonight!
Hopefully your car will start to run less rich than it used to when you were seeing 69/70 Deg C.....

Happy days !!
 

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All done under warranty.

Now getting a constant 79/80 degrees C on the short journeys I have done today (5miles only) needle is just slightly left of centre.
Ambient temp is 4 degrees C

Before the replacement I was only getting 69/70 degrees C with needle on the first dot.

will be able to give it a good blast tonight!
Damn I was just reading through all the posts thinking I was normal range as colder outside than most peoples temps but this is exactly what I am seeing right now so looks like a few parts may have to be ordered! :sad1:
 

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Hidden OBC menu will allow you to monitor the oil and water temps.

Water temp should be 78-79 minimum after 5+ miles of driving. Oil temps are typically 5+ higher than water temp once the car has been driven 15+ min.

Coolant temp gauge should be just to left of center, oil temp should be about 7 o'clock position, slightly higher than first left dot.

Finger inside the tailpipe should come out fairly clean, otherwise time to get parts ordered. Search the forum, there are some good parts lists, you will need at least 6 O-rings, 4 large and 2 small, order at least 2 more large as it is HIGHLY likely you will damage the large O-ring on installation. Suggest replacing the inner seal, not easy if you do not have the correct tools, again search and you will find details.

Not a hard job, just hard to get right the first time. Once you know how to do it, not bad.

Good luck.

No need to remove the intake box, need to pull a few Vanos line connections, but not bad.
 
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