318i cooling prob

[garymillscab]

i have a 318i 1990 m40 and there doesent seem to be any leeks on any of the hoses it just seems to be building up presure and making the water come from the top of the resovoir!! could it be a dodgy cap. i have also checked for air locks and have just replaced thermostat!

[eko]

Pretty sure the Rad cap should have a yellow ring (or similar) inside it!
Has yours?

No expert but it has been mentioned on here a few times about this,apparently it is a modified type that BMW used as a replacements(something like that)

Hope this helps but sure someone else will help!

[Dan318-is]

Pretty sure the Rad cap should have a yellow ring (or similar) inside it!
Has yours?

No expert but it has been mentioned on here a few times about this,apparently it is a modified type that BMW used as a replacements(something like that)

Hope this helps but sure someone else will help!

correct tony. original e30 radiator caps had a design fault from the factory, and all radiater caps were replaced under warranty by a redesigned cap with a yellow bottom on.

does your car overheat before you loose water or after?

[jonbuoy]

i have a 318i 1990 m40 and there doesent seem to be any leeks on any of the hoses it just seems to be building up presure and making the water come from the top of the resovoir!! could it be a dodgy cap. i have also checked for air locks and have just replaced thermostat!

Did this start happening after you fitted the thermostat?

[garymillscab]

yes about 3 days after .There is no leak from where the thermostat goes and i cant see anywhere else that could be leaking! also i find it overheats in trafic and drops when i drive faster and stays the same when driving normal!it also overheats after i lose water so got to keep topped up

[Brianmoooore]

Think you may have finished off the fan viscous coupling when you took it off to change the stat.