VG30E Cooling Map

[Tungsten]

VG30E version

 

 

-> Note how the coolant line passes between the IACV regulator and the upper manifold but it does not pass through either of them but only between the two.

 

 

VG30i version

 

 

 

Enjoy. Created by me with LibreOffice Draw.

 

I made this block diagram to visually show the difference between a VG cooling system circuit and a conventional cooling system. Since the VG engine designers have not followed many conventions if any at all, the cooling system is routed entirely different from a typical system. As you can see, there is no need to have the thermostat open to fill up the block. You can fill the entire block directly through the upper return hose. Try doing that with another engine.

 

EDIT: Thanks to MY1PATH for revisions.

Edited July 27, 2012 by Tungsten

[Tungsten]

Revisions posted. Thanks to MY1PATH for revising the upper manifold section routing.

[sewebster]

There is a coolant air vent (little bolt you can unscrew) in the upper plenum though, so doesn't that mean there has to be coolant in there somewhere?

[Tungsten]

The air bleeder screw? That's actually not in the plenum but only attached to it.

[sewebster]

I thought it went right into the top of the plenum. I guess I'll take another look next time I open the hood.

[Tungsten]

Here is the plenum underneath. Thanks to silverton for the picture.

 

 

Here it is without anything attached. Picture taken from Z31.com, http://www.z31.com/mods/pathy.shtml

 

 

As you can see, no actual cooling lines go through the plenum.

[MY1PATH]

I thought it went right into the top of the plenum. I guess I'll take another look next time I open the hood.

There is a little Tube for the vent plug in the casting. BUT do not let that give you the impression that coolant Flows Through the manifold because It DOESN'T.