Coolant Loss

Discuss the problems with your X5 (E70).
Andy Collings
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Coolant Loss

Sat Jun 27, 2020 7:20 pm

2007, X5, 4.8 M Sport, E70. Coolant level drops to the min level from max over a few short trips. No puddles under car or smell of coolant in engine bay, can't see any leaks.Do have a little white smoke though but not what I would call excessive. Are there any common places to look? I heard about valve stem seal problems, any definite way to tell if it's that? Tried the revving method and smoke but not sure conclusive. Be grateful for any thoughts.
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Re: Coolant Loss

Sat Jun 27, 2020 7:55 pm

Also worth checking the coolant cap seal. If it won’t maintain sufficient pressure you’ll get some losses.

Valve stem seals should be oil not water (I think). Any water in the oil will cause ‘mayonnaise‘ to form on the oil cap.

If it isn’t obvious then you may need a pressure test to see if everything is tight and find leaks with everything cold (such as a pinhole in a pipe/radiator etc).
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Andy Collings
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Re: Coolant Loss

Sat Jun 27, 2020 8:23 pm

Thank you, will check!
Leslie
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Re: Coolant Loss

Sat Jun 27, 2020 9:10 pm

The covers would tend to hide any leaks but the water pump would be one to watch I'd think.
Andy Collings
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Re: Coolant Loss

Sun Jun 28, 2020 8:12 am

Thanks will have a good look around with engine running and a good torch. Just ordered some UV dye too.

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