Do you have an electric water pump (whether for the engine or an intercooler)? If you don't, then it doesn't really matter. Mechanical water pumps only move water through the engine and radiator when the engine is on, so if you're trying to have the fans on but with the engine on and no water moving through the radiator then it's pointless.
Well unless you changed it yourself to know specifically, I'm gonna go ahead and say you don't have those. So trying to run the fans with the engine off (and the water pump not spinning) is pointless and won't do a lick of extra cooling.
While this is certainly correct, in some vehicles the cooling fans continue running for one or two minutes after you turn the engine off on a hot summer day. I can't remember whether I have ever noticed this in my Mustang (I believe I haven't), but I have definitely seen it in my Mondeo, in my wife's Kuga, as well as in two Renaults. Even though the water isn't running through the engine, simply removing the residual heat from the engine compartment does help the engine to cool down a bit. Or at least manufacturers seem to think it does.
The Mustang will do that as well. At least my EB does it occasionally.While this is certainly correct, in some vehicles the cooling fans continue running for one or two minutes after you turn the engine off on a hot summer day. I can't remember whether I have ever noticed this in my Mustang (I believe I haven't), but I have definitely seen it in my Mondeo, in my wife's Kuga, as well as in two Renaults. Even though the water isn't running through the engine, simply removing the residual heat from the engine compartment does help the engine to cool down a bit. Or at least manufacturers seem to think it does.
I'm pretty sure that's to cool down the condenser after the AC was running, and while it certainly does help shed some heat from the radiator itself it does little for the actual engine (at least until you start it back up but even then it will be a relatively slow process to cool the engine).
Usually turbocharged engines do this, because they tend to soak way more heat than an aspirated engine and have some critical hot spots when you turn them off, especially if you beat them.
Most modern turbo engine cars have this to some extent. The turbo is water cooled, but when the engine shuts down (and the water pump stops pumping) there is a designed in reverse syphon to help keep cooling the turbo (hence why there is no need to run a turbo car for a while before shutting down any more) and sometimes the fans are used to aid the removal of heat from the engine bay in general.While this is certainly correct, in some vehicles the cooling fans continue running for one or two minutes after you turn the engine off on a hot summer day. I can't remember whether I have ever noticed this in my Mustang (I believe I haven't), but I have definitely seen it in my Mondeo, in my wife's Kuga, as well as in two Renaults. Even though the water isn't running through the engine, simply removing the residual heat from the engine compartment does help the engine to cool down a bit. Or at least manufacturers seem to think it does.
I'm not sure what the problem is you are trying to fix?
