HGV,

My wagon runs steady between 80-90 which is to say somewhere less than half way between the 80 mark and 100 deg mark. It only fluctuates when explainable things happen, like sitting in traffice with the AC on or running hard uphill.

Marshall Booth had this to say on the diesel mailing list:

"As I have been told and proven many times, loss of temperature stability at high speeds is USUALLY a sign of restricted coolant low (could be radiator OR thermostat OR water pump - but that's rare) while loss of control at low speeds is USUALLY an air flow problem (but remember the fan(s) doesn't/don't come on before 95+ degrees C or higher)."

So I think there may be a flow issue. Of course before chasing down a ghost I'd like to know if the temp should reach a stead state under load or if it can be expected to overheat when run full out long enough.

Thanks,

__________________
-Mike
'87 300TD 304kmi (RIP)
'95 Toyota Camry Wagon 125kmi