Hey there ncv3 folk... Pretty nifty and straight forward mod you guys came up with here. Some of the t1n folks have a thread going to replace the existing factory d5 heater with a new one but the new one has an ambient >39f ambient temp lockout like your factory d5 furnaces do. This resistor should work just as well for us as it has for you, but some of us want to use the furnace with engine off and there’s speculation as to whether it will work without the ecm being on to interpret the sensor information and then broadcasting it over the k line to the heater. It appears some of you are running the furnace with engine off. Does this mean the ecm doesn’t need to be powered on to interpret the ambient temp information and then broadcast? Doesn’t appear anyone is powering on the ecm with the engine off to get this mod to work with the engine off. Perhaps ncv3 and t1n Sprinters are different in that the ecm is always interpreting sensor information (we haven’t tried this so I’m not suggesting this is the case)? Perhaps ours will work just as yours and we don’t need to power on the ecm??
The factory H12 Espar D5 is intended to operate with the engine off. The ignition key does not need to be in the ignition. Not much need for the D5 if the engine is running other than to bring it up to temperature quicker. Be aware once the engine coolant reaches a minimum temperature the factory D5 will not operate.
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