Cooling system pressure

[Yodageek]

I am not getting any pressure in my cooling system. The van warms up properly and the heat works. No overheating but no pressure building on the systrm. I just did the inline filter and black flake mod and I don't seem to be loosing any coolant. I'm confused. Any ideas?

[cb97alltrac]

Have you replaced the cap? The same black flakes that result in the high idle when cold also obstruct the reservoir outlet channels at the small black hoses. I would pull the reservoir and clean the outlets and see if that helps.