Found an interesting way to drain the plenum , unless some of you guys already have done this . I hooked a small hose to the glycol fluid tube at the lowest point of the plenum towards the firewall on the right side . Then the fluid will automatically syphon out into a lower point , in this case , a measured dish for 2 litres marked so I knew how much I removed . Obviously radiator fill cap is removed or open. You will hear the fluid syphon out and just watch your fill dish level and pinch off the the hose or remove it and voila, no fluid in the plenum .
I tried using a mechanical way to suck out the glycol , but nothing was happening so then tried the hose trick and that worked great .
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