Is there a need to periodically change the liquid in Alienware liquid cooling system ?

Never mind - should have done more research before posting this. Apologies

I found my answer here: http://www.asetek.com/press-room/news/183-pc-liquid-cooling-comes-of-age-with-aseteks-sealed-systems.html

Hold on...so we dont have to replace water because it says maintenance free?  Still confused lol

UPDATE:  nvm :)

No maintenance: Special material properties are used in the construction of the system. This enables very low permeability, the escape of liquid molecules through the material walls. For example, more costly specialized hoses are used instead of hoses made from lower cost, more common materials. It is this careful attention to detail that enables the unit to be factory filled and sealed for life. Traditional solutions typically have a large separate reservoir that requires periodic refilling to replenish the liquid that permeates through the hoses. Since other systems are not sealed, they also sometimes suffer from clogging due to the growth of algae, mildew or other contaminant entering the cooling fluid. Asetek’s sealed system together with the use of specially formulated, non-toxic, anti-bacterial, anti-fungal and corrosion inhibiting cooling liquid together eliminates these types of concerns. 

Water cooling has become very easy to install - no more mess and worry about leak or even maintaining it.

Oh ok...really appreciate it.  So no need to replace the water ever Im assuming...lets say another 2 years.

I am hearing some bubble noises when I start My Alienware Aurora R4 up. My warranty ran out about 3 weeks ago and since then I have had a re-installation, one of my graphic cards died and the bubble sounds from the CPU cooling system.
The bubbling noise stops after a little while, anyone who knows if I need to find a way to bleed the air out or just let it be until it needs changing