Being curious now, can you please elaborate why you think they are not operating correctly?
I have long looked for improvements to what appears to be part cavitation. Looking at scores of datalogged charts, it appears that, in most cases, coolant flow does not rise linearly with rpm. Usually the pump is the center of focus, specifically pump non-linearities. In high flow applications like ours, usually cavitation. The pump flow head curve takes on a hooked appearance at the top, indicating a point where cavitation flattens and eventually reduces coolant flow.
Many coolants are helpful at reducing this nature BTW, but pump design is the primary culprit.
I opened a housing the other day, and once I pulled the front stat out, there were sections underneat that were bone dry. By itself, it has little value in drawing concluisons. But we drilled a hole in that stat, and he has been claiming that the system is behaving differently, takes a lot longer to warmup. Improvement? Who knows. Placebo? :Thumbup:
Clearly repeatable, however, is the recurring statemnt "I flushed it, now I can see the stats cycle on the ECT gauge", or "edge now shows 180 +/-, I never saw it below 195 before". Or "all of a sudden, the degas took a gallon", after replacing the pressure cap.
If only the whole system was made of plexi, this would be less perplexing.