Join Date: Jun 2018
Location: Rural NW Oregon, in the corner by the river
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To me, it looks like it could be oil in the condensate on the radiator cap. If so, you can flush a bit of it out of the COOL radiator by filling the neck with hose water and float it out. My guess there is a gooey, aw ****, residue needing wiped out.
Does the underside of the engine oil fill cap or even the dipstick have any of that milky goo? Peek in the coolant overflow tank while shining a light into it and what does it look like? Oil in your coolant isn't to be ignored.
The only other thing I can think of is Dex-Cool going over to the dark side or maybe some green coolant got topped off into the orange. Good radiator caps are essential with Dex-Cool too. Either way, don't let this thing get ahead of you. Es no bueno.
'03 3.4 with lots of miles, 230k+