Tractionman
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EDIT. That should read underside of the top of header tank, I.e.the cap.
Is there 2 separate pipes connecting between the rad and the expansion bottle on the 80 series? There's only 1 on my 90 series which fills the bottle and sucks it back, if it fell off, the bottle won't still get filled. Is the 80 series different, I'd have thought it strange to have 2 separate hoses for fill / suck back.Some movement of coolant in the rad is normal, with vibration and the water pump working.
I am not familiar with yours, but does it have a rubber hose fixed to the underside of the header tank( overflow bottle). If so, check it hasn't dropped off. If it has, when there is expansion in the coolant, excess is pumped out of radiator into the bottle, when system is cooling that excess is then sucked back into the system.
If there is a pipe and it's fell off, coolant will continue to fill the bottle, but not suck it back up
No just the one.....Is there 2 separate pipes connecting between the rad and the expansion bottle on the 80 series? There's only 1 on my 90 series which fills the bottle and sucks it back, if it fell off, the bottle won't still get filled. Is the 80 series different, I'd have thought it strange to have 2 separate hoses for fill / suck back.