OT: I'm getting hot warning
Reading Gene's post about radiator puking coolant and BigKriss's post about headgasket blowing has got me thinking. Yes I know its dangerous. We have got 4 sensors on the car and none are bright enough to tell us BEFORE the engine gets too hot and does some damage:
The engine temp sensor must tell the ECU but it keeps it to itself
The low coolant only works when the engine is stopped - bit late then
The aux fan wont cut in if the coolant is low because the sensor isnt in contact with hot coolant. So that wont save the day
The temp sensor may tell the gauge but thats not very accurate and you might not notice it till its too late anyway
So I'm thinking why not link into a temp sensor circuit that will bring on the 'low coolant' warning and the accompanying 'bong' while the engine is running? Wouldnt want to meddle with the ECU circuitry but the gauge sender is a likely candidate. The E34s suffer from overheating and the E39s even worse. Any thoughts or should I go find a good book....?
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Originally Posted by DaveVoorhis
After hours of research (ok, a few beers) my colleague in the stage lighting business tells me we need a thermocouple. I only know them as the safety device to turn your boiler off if the pilot light goes out. He tells me they use them in stage amps to ditch power if they get too hot. Some have a pot so you can adjust them. So we just need the critical temp at which the switch should throw. I intend to patent this device so dont tell anybody
