- Tue Jan 19, 2021 12:20 am
My post may not make sense to you...
I have done quite a few things on cars in my live and one thing I repeatedly tried was the nice idea to move the fan switch from the radiator to the engine. Or, more important, not to have to install a switch in a radiator that had none.
Tried it a few times, in any case this gave fluctuating water temperature, much more than with the radiator switch. The radiator switch controls the temperature of the water that runs to the engine. Too hot,it instandly turns on and a few seconds later the temperature drops as far as the fan can do.. If you use the engine water temperature sensor, its position is in most cases optimized for the ECU or a gauge, which should not react too fast. Controlled from this position the engine has to get too hot before the fan kicks in.
Understand the difference? A cools the water before it enters the engine, B reacts when the engine gets too hot.
I do not say that this will ruin an engine or even cause trouble, but it makes people nervous when the engine temperature in slow traffic cycles from 90-105°c instead of 90-95°C.
VW, for example, intentionally makes their dash instruments insensitive from 80-105°C, so the needle does not show noticeable movement in that region.
If you do not want to believe me, maybe think a second about why car manufacturers go the expensive way of positioning the fan switch in the radiator, causing trouble on installation and extra wires, instead of the cheap way of screwing it into one of the already existing plugs most heads have in the casting? See, no nonsense young Jedi...
A well working water thermostat combined with a radiator thermal switch works best so far. Maybe try it out before calling something nonsense.