Club 80-90 Forums

should you be able to suck/blow both ways through the spout on the cap ? i can suck through the spout but not blow....so the expanded water goes into the overflow tank but doesn't get sucked back into the header tank(by the way its a brand new cap from brickworks with vw/audi logo on)

You should be able to blow through the spout, but there will be some resistance and you have to blow quite hard. It might make the characteristic 'quacking' sound.

Some will tell you that you shouldn't be able to suck through the spout, but in fact it only seals properly when it's screwed down onto the reservoir. When it's not screwed down, the valve unit is held place by a rubber washer which, although a tight fit, isn't air tight.

CJH wrote:You should be able to blow through the spout, but there will be some resistance and you have to blow quite hard. It might make the characteristic 'quacking' sound.

Some will tell you that you shouldn't be able to suck through the spout, but in fact it only seals properly when it's screwed down onto the reservoir. When it's not screwed down, the valve unit is held place by a rubber washer which, although a tight fit, isn't air tight.

I can suck through the spout,with some resistance,but can't blow through it.
That's the least of my worries now,i think the head gasket has gone... or worse

just tried the cap again tonight.. i can blow through the spout & it quacks but can NOT suck trough it.. is this correct please ?
kev

That is correct..

thanks Rob,
Now i just need to sort the head gasket out