Quote:
Originally Posted by lida
Carried out probe test to coolant once reservoir had cooled enough to open. Temp showing a 20 degree difference between what is being read on I.P. which confirms there is fault with current temp sensor.
|
Quote:
Originally Posted by TourerSteve
With the above diagnoses you have to now try a temperature sender unit ...
|
Hello Steve,
As you can see the garage removed the expansion tank cap and directly measured the temperature of the coolant within. It was lower than the reading from the car's coolant temperature sensor (CTS) which is mounted at the hottest point in the block. From this the garage concluded that the CTS is over-reading.
As the expansion tank is not positioned in the flow of coolant (it is essentially a reservoir) of course it will be cooler than the engine block. This can be verified by touching the expansion tank and the top radiator hose of a running engine and noting the difference.
An over-reading CTS would not cause the fan to fail to reduce the coolant temperature which is what is happening.
Simon