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Now we have very warm raw water, I have discovered I need both coolant pumps on to hold 180 degrees at high power settings. With only one pump on at full power I can hit 200-210 degrees or so. 50/50 coolant with a 4 PSI cap will not boil at this temperature and this is how all modern engines run anyway, but I just don't like it.
My plan now is to take the end caps off the heat exchanger and see if it needs cleaning. If that doesn't do the trick, perhaps add another heat exchanger and/or oil cooler*? I know part of this is mental, I am so used to RWC that the higher temps keep setting off a mental alarm. I have checked the overflow bottle and the level seems the same plus the coolant seems to be ambient temperature, so I am assuming I am not ever opening the pressure cap.
* I have no idea how much it effects the A4, but an oil cooler is another way to remove heat from an engine besides for not overheating the oil.
My plan now is to take the end caps off the heat exchanger and see if it needs cleaning. If that doesn't do the trick, perhaps add another heat exchanger and/or oil cooler*? I know part of this is mental, I am so used to RWC that the higher temps keep setting off a mental alarm. I have checked the overflow bottle and the level seems the same plus the coolant seems to be ambient temperature, so I am assuming I am not ever opening the pressure cap.
* I have no idea how much it effects the A4, but an oil cooler is another way to remove heat from an engine besides for not overheating the oil.
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