Jay, Yes, of course. The Ecus are sealed, and they do have to stay sealed. As I described previously, I made an small aluminum cover which is air-tight sealed with epoxy glued to the ecu plastic cover. This way the air of the internal fan circulates only within the Ecu. There is no outside air leak. There is quite a bit of additional heat exchange through the new aluminum cover, which is also cooled by the external fan. In short, the Ecu is still sealed, and as you say, that's important. I should have taken some photos when I did this, but I thought it was too unorthodox to recommend to others. But I don't have any problems with that setup, and my vanagon hasn't given me any driveability problems since. I have since come to believe that many vanagon problems are caused by overheating Ecus. Harald '90 westy Jay wrote: Aren't these things sealed for a reason? Seems like you could develop more problems from moisture and corrosion. What if your rear heater core lets go! Jay
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