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[plumber]

Hi

On removing my passenger side wheel to inspect the brake pads i noticed a black gromit about the size of a two pence coin  on the right hand side on the wheel arch ,this was leaking water? So i removed the plastic gromit and got soaked  on closer inspection i have found a plastic tank which i assume is holding the water
can anyone tell me what this is thanks Tony 

[tunnie]

sounds like the scuttle drain, which you should have been keeping clear 

[Bent valve]

Thats the header tank that houses the ballcock that supplies the laughing shaft with coolant! as you are a plumber I would have expected you to know that

[tunnie]

passenger side scuttle, remove the plastic for the bonnet seal, there is a little flap which has access to the drain from above.

This should be kept clear, other wise it will end up killing the heater matrix, and causing your front passenger side carpet to become wet.

[plumber]

Thanks for the reply tunnie ,how will this cause problems to the matrix.How is it linked ?

Thanks Tony

[Andy B]

......
how will this cause problems to the matrix.How is it linked ?

Thanks Tony

They're not! 
If the scuttle drain is blocked, it just means that water doesn't drain through, and drains into the car's passenger footwell instead! 

[Bent valve]

Thanks for the reply tunnie ,how will this cause problems to the matrix.How is it linked ?

Thanks Tony

It wont! its the laughing shaft you shuold be worrid about

[tunnie]

i seem to remember leaving the scuttle blocked will cause knock on problems to the heater matrix.....

[plumber]

Thanks
The water that is leaking out of the gromit is linked to a plastic holding tank fitted in a box section which you can just see from underneath the car.

About 3 inches from the gromit there is a rectangular spout about 2 inches long and this leaks from time to time.

Tony

[Andy B]

Thanks
The water that is leaking out of the gromit is linked to a plastic holding tank fitted in a box section which you can just see from underneath the car.

About 3 inches from the gromit there is a rectangular spout about 2 inches long and this leaks from time to time.

Tony

Look at the scuttle drain cleaning guide! 
http://www.omegaowners.com/forum/YaBB.pl?num=1167524083

[plumber]

Thanks tunnie!

The scuttle drain was blocked as you said

If you lived closer i would buy you a pint!!

Thanks