http://www.ehow.com/how_7369_burp-cars-cooling.html

& this one makes a good point that you should have circulation through the heater core while performing this process.

http://automotivemileposts.com/garage/v2n15.html

Most cars are 'self purging' & you don't have to worry about it. Since the closed loop cooling system has been slightly modified with the overflow reservoir to still be closed loop (no air can get in) but have open loop benefits (allow for fluid expansion without letting air in).

Some cars do have problems in the design. Mitsubishi Eclipse is notorious for trapping air behind the thermostat which will keep it from opening. In that case I was able to burp it by removing the temp sensor (which is right where the bubble gets trapped) & put it back in while anti-freeze was dribbling out all over my hand, running down my arm, & dripping onto my leg - point being: don't do it with a hot engine. All of that is irrelevent since you aren't working on my Eclipse but it is good background info for you.

Since I don't recall any VX owners complaining about having to burp their cooling systems, I don't think that this is your problem. But ... it's easy/cheap to do before you start tearing into your water pump or thermostat.

BTW, some parts stores sell a burping kit that is just a funnel that goes on & fits tight where the radiator cap goes. It allows excess coolant to replace any bubbles that escape & not allow any air to get back into the system. I don't think that you'll need that though.