On Sun, 18 Aug 2002, Dennis Haynes wrote: > Sounds kike a bad head gasket or cracked head. While the engine is > revving, the combustion gasses are getting into the cooling system. You > do not see the "bubbles" while the engine in being revved due to water > pump pulling through the coolant tank. When the engine returns to idle, > the pump pulls less allowing the air the enter the tank quickly, > releasing the bubbles. This is why both the cooling systems on both the > diesels and water boxers have problems after extended highway runs. The > gasses keep building up until there is no place to go and they either > vapor lock the pump or blow everything out the relief valve. That's *exactly* the symptoms I had with a cracked head on my diesel Westy. While driving the combustion gases seemed to accumulate in the radiator, in fact the entire top half of the radiator would end up *cold*. (Bad, since that's where they put the fan switches.) _ _ __ _ _ _| | | | David M. Brodbeck (N8SRE) Ypsilanti, MI / _` | | | | | | +----------------------------------------------------- | (_| | |_| | | | @ cyberspace.org \__, |\__,_|_|_| "Geekdom is fantastic at being AGAINST something, and |___/ it's hopeless at being FOR something." -- Andrew Orlowski in The Register. |
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