Originally Posted by
autosparky
Your coolant temp sensor works on the earth side, then the other side of the temp clock as an ignition feed to it, so when you disconnect the wire off sensor and put it to earth it should go to the top.
As your question : as the coolant temp increases, the resistance value and the signal voltage decrease.
I understand that the ign 12v comes from the dash. What I was asking is weather the sensor (thermister) changes the voltage it lets through, or the current. I'll get a volt meter on it I suppose. Was just being lazy!!
Matt