Thread: Coolant loss - what connects to header tank

Before replacement with the Allisport tank, mine was leaking slightly, but only intermittently due to a very small crack. Check carefully for that common issue.

I'll be installing mine tonight, it's fantastic quality

Veeery Beauty!!!
Oh to be rich.( but I own a D2)
(which BTW has not cost me too much money over the 7years I have owned it but a LOT of manual labour in preempting the usual problems That spiral into extreme expense like transmission lines, FPR hose, FPR, VC bearing, leaking exhaust manifold, water pump, regularly changing 4HP22 fluid, diff seals etc etc.)
I think the mods have cost me more


REgards PhilipA

That looks like an EU2 header tank, The bit that leaks does not have a pipe on it.

header tank_LI.jpg

Here you can see the EGR cooler pipe, sealed at the bottom. If coolant is coming out of there, then you have a leaky tank

So what is the hole for I have circled in the first post. There is nothing connecting into it, but it was certainly where the coolant was pouring out from. I thought there might have been some kind of plug in it that had come off (which worried me due to pressurization), but looking at replacement tanks, none of them have anything in it, just a hole. I am stumped.

Originally Posted by PhilipA

Veeery Beauty!!!
Oh to be rich.( but I own a D2)
(which BTW has not cost me too much money over the 7years I have owned it but a LOT of manual labour in preempting the usual problems That spiral into extreme expense like transmission lines, FPR hose, FPR, VC bearing, leaking exhaust manifold, water pump, regularly changing 4HP22 fluid, diff seals etc etc.)
I think the mods have cost me more


REgards PhilipA

I know what you mean Philip, I believe mine is having a mid-life crisis also. Past 3 years, water-pump, alternator, master cylinder, 2 x hubs, FPR, fuel pump, warped manifold, all the bits that are meant to wear out have been true to form. But as you say, we get to do all these things ourselves, labour is free, and wouldn't swap it for any other vehicle (within budget). I love the fact that with a few mods, no D2's are the same.

No idea what that hole is. Maybe different models (BMW) had a hose there. Does it leak out of the hole? have you filled it with water away from the car and watched?

Originally Posted by surfingooner

So what is the hole for I have circled in the first post. There is nothing connecting into it, but it was certainly where the coolant was pouring out from. I thought there might have been some kind of plug in it that had come off (which worried me due to pressurization), but looking at replacement tanks, none of them have anything in it, just a hole. I am stumped.

That port was originally for the EGR cooler return that's a fact so if the EGR was deleted this port is futile so you need a Eu2 tank which doesnt have this port at all as it didnt have EGR cooler, you can buy BMW E30 tank which has a low level warning switch too, see from the following post and beyond td5 engine saver low water level alarm