What exactly is an airlock? If you can get airlocks on van mounts how do you get rid of them. Never had one yet in all of 2.5months( 
) so if and when i do will need to know what to do?
? Thanks chaps.
an air lock is a bubble of air trapped within your system, this can happen from an unsecure fitting thast is letting in air, same happens or central heating systems a rad will go cold if there is an air lock, you bleed/open valves and release the trapped air.
on a system you would do the same and check all connection for air leaks if it comes out in can go in, 1 drip from a house can put air in.
Ian