Coolant leak - expansion tank?

C

CRAIGO

Member
 Manchester
My 2003 3.0i is currently parked at work having driven in this morning. Walking past this afternoon, I noticed a very small 10cm patch of coolant directly under where the expansion tank lives. I can’t strip off the radiator cover now but I’m assuming the expansion tank has developed a very small crack through heat cycling.
The coolant gauge still shows as full so I think I’ve caught this in time!



1. I assume it’s safe to drive the 5 mile journey home, heaters on full and taking it easy judging by the minor coolant loss?

2. If it is the expansion tank, can anyone recommend a suitable replacement?

I’ll also need coolant which service history shows was changed in April by a BMW Indy. I plan to top up rather then drain the entire system so what coolant is recommended?

Many thanks
 
Dont buy cheap crap. Hella are the OEM I believe and you can get Hella branded tanks for around £40.

ECP sell them, but youll have to put vehicle details as an E46 3 series as they dont show up under Z4s for some reason. It's the part I have fitted so believe me, its the same!
 
I fitted a Meyle HD one. Super OEM quality, 2 year warranty, went in easily and no problems since. I have fitted many FEBI Bilstein parts to my Zed which I think are excellent so would think their tanks are also good. IIRC when removing my original BMW one it was a Behr so they are probably fine too.
I have had Comma Xstream G48 coolant in mine for 4 years now :thumbsup:
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