Coolant overflow hose o-ring

[tagta3]

Hey everyone,

I need a new O-ring for the coolant overflow hose that plugs into the thermostat housing. P/n 11537838219

I looked up the part but the drawings don’t list the o-ring as a separate part. Does anyone know what size it is or has anyone had to replace it before?

I think what happened is that the o-ring sheered when I replaced the thermostat because the hose was never removed before since the car was manufactured.

[SAMM3Y]

You need the whole hose. The rest of it is broken off inside of the water pump housing.. use a lag screw to thread it in there and pull it out.

[tagta3]

The hose is intact, but the o-ring has slightly sheered but enough to cause a very slow leak. See attached pic.

[acarr6]

Originally Posted by tagta3

The hose is intact, but the o-ring has slightly sheered but enough to cause a very slow leak. See attached pic.

Same thing happened to me. Replaced whole hose. Around $50 I believe

[BanjoPaterson]

Whole hose - and best to do both sides.

Had this happen to me and it was caught by my M3 mechanic. Not too expensive and good to replace.

[Scrippy]

No O-rings or individual parts available, just the hose.