Coolant system changes for DBW/ E-throttle (IACV and secondary bleeder delete)

[CowsWithGuns]

Hey all,

I'm setting up to go DBW (IACV delete) and the front bleeder is blocking my new intercooler piping (and it's grievously ugly). Wanting to confirm that I am not preparing for grief with these coolant changes.

These are the flows as far as I can tell. I am hoping that I can block off all red and blue lines with no issues.

Assumptions are:

• The radiator cap will now be the highest point, eliminating the need for bleeders. I vacuum bleed anyway.
• The three lines to the intake manifold (green, red, blue) also converge with purple from the head and bugger off out the snout to the radiator.

My main concern is that I may be introducing 'air traps' by blocking off the two nipples (lime green circles below) at the top of the intake manifold. I don't understand coolant systems properly yet - will this air eventually fart its way to the radiator? If not, is this of any significance? It's a very small volume but I've had some traumatic coolant experiences and seek assurance

Cheers

 

[robbo_rb180]

Run a swirl pot, will remove all the air from system.
I did that and never had an issue. I drill and taped the 2 light green circled points and put in bolts with copper washer, can also use as bleeders.

 

[CowsWithGuns]

14 hours ago, robbo_rb180 said:

Run a swirl pot, will remove all the air from system.
I did that and never had an issue. I drill and taped the 2 light green circled points and put in bolts with copper washer, can also use as bleeders.

Haven't heard of these until now. Looks the goods, ty for enlightening me.

From reading this thread I think I will run it like so (teeing into the thermo housing rather than adding more stuff with a rad hose adaptor). Seems like a sweet 'guarenteed to work' solution as it utilises all the OEM bleed ports. It's a shame to add more mess to the bay, but better than bleeding these demons. Also means I don't have to take the intake mani off to drill/tap

This is a GK swirl pot so if the gods are kind all the fittings will match up too!