[V6-12v] Radiator Fans not switching in correctly...

[Tom Christiansen]

James,

In some cases the cap will rattle, but the brand new one I got from
the dealer was of a different design that didn't rattle. The only way
to know for sure is to pressurize the cap. Not surprisingly there is a
tool for that. The pressure valve should open at 15 PSI (if I recall
correctly). Your Audi dealer can help you with this (for a fee).

The water pump I bought for mine had a metal (brass) impeller.

Tom

On 9/6/06, James Whitehouse <james_whitehouse1 at yahoo.co.uk> wrote:
> Hi Austin,
>
> Thanks, the car has been very slow getting up to temp in the last few
> months, so I wonder if that could be a potential problem. I had just thought
> the thermostat was getting dodgy, but perhaps the thermostat is a more
> recent problem that's stuck closed and now causing the overheating!
>
> Is there any way, short of replacing it, to tell whether the coolant cap is
> faulty? For example, should it rattle/not rattle if you shake it, etc?!
>
> Cheers,
> James