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that doesn't sound good.I ran into that problem before. first I thought it was a cracked block then it was only a cracked head. I hope in your case it is not. I think you should do a compression test
first to start I dont think a pressure test will help. I just got one done on my van the mechanic told me that a pressure test does nothing he told me pull the plugs one at a time look for a plug that is shiny with no carbon LOOKING FOR CRACKED HEAD if you have a compression tester check them the chocolate you see is anti-freeze mixed with oil you will have do a major clean job after you found out what the problem is then use cLr that will clean out rad- heater-core etc post back this is a topic you don't see or hear much GOOD LUCK
If you recently acquired the van, the previous owner may have tried to seal a leaking radiator or heater core. Certain brands of radiator stop leak bear a close resemblance to your description. Any of the kaolin(Georgia clay) based formulations will impart a brown, frothy character to the coolant, especially if too much has been used.
If you have ever used Kaopectate for human 'leakage', you will recognize the same constituents. Both agents utilize refined, Georgia clay for the same reason: to plug leaks.
(Isn't this a great site - where else on the web could you find a discussion equating radiators and diarrhea?)
A long shot: Volkswagen (I know, wrong site) is reported to advise not to mix their "pink" coolant with the conventional "green" stuff. Result is chocolate shake like gunk in radiator.
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