Datatek
Well-Known Member
If the third sensor is there to operate the aircon fans on an engine overheat, it will be a normally open thermal switch with a set point of 105/110C, so it would normally be open circuit. A temperature gauge sensor on the other hand is a variable resistor of one sort or another. So with the black sensor there would be no gauge movement.
Using a potentiometer to test does not always work, it depends on what sort of sensing element is being used. The sensor is screwed into the head and has 2 wires so it could effectively have 3 connections, and there are other 2 wire sensor elements that cannot be mimicked with a pot.
I reckon it's odds on that fitting the correct sensor will give you a working gauge.
Using a potentiometer to test does not always work, it depends on what sort of sensing element is being used. The sensor is screwed into the head and has 2 wires so it could effectively have 3 connections, and there are other 2 wire sensor elements that cannot be mimicked with a pot.
I reckon it's odds on that fitting the correct sensor will give you a working gauge.
