V8 coolant overflow tank - gasket under lid?

[Circlotron]

The V8 and V6 coolant overflow tanks are different, so I read.
On my V8 one, every time I go over these stupid speed bumps near my place, the coolant splashes around inside the tank, and a small amount dribbles down the outside of the tank. Is there supposed to be some kind of gasket or seal under the lid to make it fit better and stop this happening?

 

[Immortality]

Not that I'm aware off but the lid should clip down over the lip of the overflow bottle.

 

[Circlotron]

The lid does in fact clip down.
And it's reasonably hard enough to open, not loose or anything.
Neither does it wiggle from side to side.
It just doesn't make a water tight seal, and if coolant splashes around inside some finds it's way out.

 

[Immortality]

Check that the overflow outlet tube in the lid and hose aren't blocked.

 

[somefool]

Ive had the exact same thing the coolant leaks out from under the cap, there probably was a seal there once upon a time however I fixed it by using teflon tape (plumbers thread tape)

Just wrap that around the lip on the coolant overflow bottle where the cap clips on.

You do need to replace it each time you undo the cap though, as it unwinds. It is tape after all.

 

[Circlotron]

Okay, now we're getting somewhere.
I have a roll of electrical tape that is only 12mm wide so I might try a bit of that, and if it is a total failure then I'll get some teflon and give it a go.
The overflow is definitely not blocked because on a 40° day with the a/c going when you turn it off above a certain temp it boils over and spews about 2 cups worth of coolant on the ground through the overflow hose. Next summer I'll have to get an overflow for the overflow and *concatenate* them.

 

[Muke]

*concatenate*

Huh, what? Big word. *gets dictionary - can't find word, uses google* Aha. Der, that makes sense. :doh: Learned something more than just car stuff. :thumbsup:

 

[Immortality]

Okay, now we're getting somewhere.
I have a roll of electrical tape that is only 12mm wide so I might try a bit of that, and if it is a total failure then I'll get some teflon and give it a go.
The overflow is definitely not blocked because on a 40° day with the a/c going when you turn it off above a certain temp it boils over and spews about 2 cups worth of coolant on the ground through the overflow hose. Next summer I'll have to get an overflow for the overflow and *concatenate* them.

Radiator cap is stuffed. It shouldn't boil over when the engine is shut down, that only happens when the system isn't holding it's pressure properly.

Might solve your other problem too.

 

[Cheap6]

You should be able to buy the seal between the overflow bottle and cap as a genuine part. It's self adhesive and made of an expanded foam material.