Radiator Problems With My E34--help!!

[johnbmw]

I've recently bought a 1990 E34 and every now and then the coolant fluid starts to spill out through the cap...the first time this happened I though it was just that I left the cap lossened, but it keeps happening over and over again. Why does this happen? can somebody help me out?

thanks..

[billB]

BAD CAP may be?

[Torque]

maybe you have too much coolant in there.... when the coolants/hoses are cold to touch your coolant level (in the expansion tank under cap) is suposed to be up to KALT (cold)...
]
when coolant heats up it expands and the cap is made so it opens up a bit to release excess amounts (if you have too much in there to begin with)

[billB]

JOHNBMW:but it keeps happening over and over again

As such how much excess coolant the car has?

[e28m30]

what kind of e-34 (m20.m30-m50 w/o vanos). is the car overheating, coolant look brown, like stop leak?? start the car cold w/ the cap off, & rev it up, does the coolant circulate in the tank, got heat..come on man give me some help.

[CosmosBlack]

Maybe you should get a new cap, doesn't cost much.
I had a 95 E34 which had a recall on the radiator cap.