[Fluxmaven]

My thing is, I'm already going to have the datavac out if I'm draining the loop since I dust off the fans and such anytime I have the computer apart. I'd rather give the tube a couple quick bursts with the datavac than be huffing and puffing on it myself.

 

[Slaughtahouse]

DataVac, air compressor, can of compressed air, breath... it really doesn't matter. Any increase in pressure will help push any remaining fluid in your loop. It's really that simple.

Use what you feel comfortable with; None of the solutions here are wrong.

 

[Barefooter]

If you are going to used compressed air be very careful. I would not do that unless you have a pressure regulator and keep it less than 12 psi.

Good loop planning, a well placed drain, and an air bleed at the top of the loop is the best way to have good drainage.

 

[Mr. Mojo]

I wouldn't run 150 PSI through it or anything, but most name-brand cooling components are durable enough to withstand a decent amount of pressure. You'd be more likely to blow a line out of a fitting than crack a block or bust a radiator, and even that would take a good amount. It's far from scientific, but Jayz hooked a compressor to a sealed loop and ramped up the pressure until it failed. It withstood a lot more than I thought it would.

 

[gijoe50000]

Isn't blowing air through your loop with a compressor basically the same as running your pump when it's dry?
I'd imagine it would spin the impeller on the pump really quickly and could cause a lot of damage..
Or am I totally off the mark?

 

[Soulpatch]

Not to mention these systems are extremely low pressure. It wouldn't take much to blow an o-ring.