Nissan Micra Radiator Problems

When the car is cold there seems to be a trickling noise coming from the passenger side which worsens when I am stationary and rev the engine. The noise lessens as the car warms up. It is almost as if there is air in the system.

I noticed a slow(ish) leak under the front passenger side of the car it is comming from back of a metal rectangle in front of the of the left-hand side drive. its not dark like burt oil its clear with a yellow tint to it. i have no idea w...

overheating,steam coming from bonnet,but still has water in expansion resevoir