Coolant spit

2003 - 2009, roadster, coupe, facelift
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Tkghali
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Coolant spit

Post by Tkghali » Tue Jan 14, 2020 12:51 am

The car (e85 3.0 ) spits coolant through the radiator cap when the engine is hot and only while driving the car ( doesn’t when I let the car sit and get up to temp )
I replaced the thermostat and still the same thing is happening again, also it doesn’t show any sign of a bad or blown head gasket.
Anyone had this happen or know what causes this to happen ?
All help appreciated
Thanks in advance

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Smartbear
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Location: In a barn

Coolant spit

Post by Smartbear » Tue Jan 14, 2020 7:20 am

Try a new cap :?
Rob
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e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4 :P
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si, i foolishly sold my trouble free car...

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Machine monkey
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Location: In the shire Oxfordshire

Coolant spit

Post by Machine monkey » Tue Jan 14, 2020 7:25 am

I have a rad almost new tank and new hoses for sale. But as said just try a new cap first
My little blue zed is in lots of bits. With lots of things started and not many finished! I may have found the limits of my time and ability!!

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Tkghali
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Coolant spit

Post by Tkghali » Tue Jan 14, 2020 3:44 pm

Sorry forgot to mention I tried new cap first since it was the easiest option

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kis
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Location: Surrey / West Sussex Boarder

Coolant spit

Post by kis » Tue Jan 14, 2020 3:54 pm

Could be a split (crack) in the expansion tank near the cap? So looks like it’s the cap... but could be the threaded section?
Rare '15 Plate E85 Z4 3.0i SMG

BMW Family History (past and present):
1 Series - E87
3 Series - E46 320ci, E46 M3, E90 (x2)
4 Series - F36, F82 M4
5 Series - E34 (x2), E39
X5 - E53, E70
X6 - E71
7 Series - E32

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