I was pondering the design aspect of controlling the cars coolant fans from the switch in the radiator, and am wondering why is it done like this???
I can understand why an old carby car would run this sytem.....Simplicity, but why would a modern efi car with the capabity to switch the fans from the ECU use this system??
Its adding another sensor/switch where there is a perfectly good one in the thermo housing.
I have been running my fans from the ecu for a while now and cant really fault the modification.
I am critical of the radiator sensor because when the revs are down and the temp is up, and the car is stationary it allows a spike in the coolant temp that just does not happen with an ecu controlled fan.
WOuld anyone care to have a guess at why renault and possibly other manufacturers continued with the radiator fan switch long after efi was introduced??