drivin' with a weird
smile on his face
Join Date: Jan 2008
County: Zuid Holland
You have three, or two temperature 'sensors' depending on the ECU you have.
or switched by a 2-stage (low/high) temperature switch which sits directly in the radiator
or switched by the ECU, ECU has it's own temperature sensor.
The ECU measures engine temperature with it's own temperature sensor.
The temperature gauge also has its own temperature sensor, included in this sensor is also a thermal switch that is connected to the 'too hot' red warning light, also in the gauge.
Now your fans are running normally, or switch on only shortly and you don't see the warning light. It is not likely that the ECU's temperature sensor/thermal switch for the fans AND the thermal switch for the warning light are both knackered
- tells me that your engine temperature is fine.
Now for the funky gauge: all temperature sensors in the GTV are temperature resistors of the NTC type [negative temperature coefficient]. This means a HIGH temperature will give a LOW resistance; your gauge will therefore show a low temperature with a high resistance, a high temperature with a low resistance.
So if your gauge goes to max, it is seeing a (very) low resistance which in this case is likely a (partial) short circuit.
What I believe is that the gauge-temperature sensor is knackered, or the wiring to the gauge, giving the symptoms you describe. With changing the temperature sensor, you might have changed the one of the ECU and not the one of the gauge, please find the pic below that should point to the temperature gauge's temperature sensor.
Hope this helps,
Only Crusoe got his work done by Friday