I just have a couple of concerns about the coolant in my Ford Focus 1.8 Petrol (1999 T).

Firstly, when I check the coolant reservoir, I notice that on the inside surface of the reservoir there are what look like bubbles/condensation which are present whether the car is cold or hot it seems. I haven't taken much notice before now about this.

Secondly, as far as I know the coolant has never been completely renewed since the car was new, although I have always kept the concentration of the coolant mixture correct and it has a FSH. When I look at the coolant in the reservoir I notice that it has a small amount of "debris" - would a certain amount be normal ?