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Originally Posted by clf
Fan does not operate in econ mode.
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Readers could misunderstand that Alan. We are discussing coolant temperature here, not air conditioning. The radiator fan operates according to coolant temperature in any mode; 'Econ' or 'Auto'.
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Allow for the ambient temperature when referring monitoring the coolant temp. as Kaiser says above.
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Ambient temperature does not affect the opening temperature of the thermostat and that's what's at stake here. Your experience with a diesel may be different because they are notorious for having thermostats which open too early (so I'm told). Kaiser will have problems because he's fitted an 82 degree thermostat to his metal housing. That will open too soon in winter temperatures and, coupled with the cold ambient airflow through the radiator, will keep his temperature in the low eighties when it should be in the low nineties.
The thermostat in the KV6 should be an 88 degree type which will ensure a running temperature above that and an efficient heater.
Simon