LOL yes I think it is time, I do not know what the hell that is, almost looks like you are fermenting something in there, does it smell bad?
that brown color can be from any number of cooling system problems from mixing of coolant to oil to iron corrosion, but i cannot think of anything that would cause foam? looks like a rather stiff foam at that like there is some solids in it, like the consistency of alge.
I guess clean it all out and see what happens after that, see if it reforms, with clean coolant in there you should be able to do the bubble test. watch out for false positives it will burp bubbles in bits and spots shortly after the system is filled and the air pockets make their way out,
I would go short with the next coolant flush, maybe 6 months or so if everything else checks out OK, there will likely be remnants of this funk even after this coolant exchange.
that brown color can be from any number of cooling system problems from mixing of coolant to oil to iron corrosion, but i cannot think of anything that would cause foam? looks like a rather stiff foam at that like there is some solids in it, like the consistency of alge.
I guess clean it all out and see what happens after that, see if it reforms, with clean coolant in there you should be able to do the bubble test. watch out for false positives it will burp bubbles in bits and spots shortly after the system is filled and the air pockets make their way out,
I would go short with the next coolant flush, maybe 6 months or so if everything else checks out OK, there will likely be remnants of this funk even after this coolant exchange.