Hello, Please help me if you can.

I have owned my beloved Mondeo for just over 3 years with largely no issues at all.

However in the past week I have noticed a faint noise that sounds just like trickling water, or water being poured into water, slowly, the noise is quite faint and I only really notice it when crawling in slow traffic or when pulling away slowly on quiet roads. Although not all of the time.

My Mondeo is a W reg petrol automatic. It has had a new radiator about a year ago and the coolant level is currently at 'MAX' like it always has been. I have not noticed the temp gauge rise at all.

I am quite concerned as to what the issue might be as after I took it to a garage yesterday he couldn't find any faults, but to be honest I don't know what he checked, he did tell me that as my Mondeo had the Zetec engine it would not be the head gasket, however he did not test this (or anything else except a visual look).

I will give what ever info I can if you need anything, please ask.

Please help if you can, I am concerned that things might get worse.

Thank you.