Why can I hear water flowing through my Vauxhall Astra's heater matrix?

I have a Mk4 Vauxhall Astra 1.6 8v. When I start it and pull away I can hear the water flow throw the heater matrix. It never loses water temperature and there is good hot air in car, no oil in the water...

Should the antifreeze in my Citroen be changed every three or four years?

There does not seem to be a specific reference in the service schedule to changing the antifreeze in my 2006 Citroen 1.6-litre 16v. It is always checked at the service for concentration but does this take...

Does my daughter's 2005 Clio really need a coolant and brake fluid change at 13,000 miles?

A Renault main dealer is suggesting that my daughter's 2006 Clio (1.4 petrol) needs a coolant and brake fluid change (mileage is about 13,000) - they are pushing the "special offer" at £50 each. Should...