[T.L.]

On my third and fourth test on the day we ran the car without the blower fan in front of the car for a good 7 minutes at 100kmph to get the thing really hot, then when the car was struggling with cooling we turned the blower fan on.

The normal fan on the car was on as usual as we couldn't turn them off. I wouldn't want a switchable fan as I might turn it off by mistake, I would probably just pull the wire that leads to the fan from the battery relay instead.

On my 40 series I will be putting a switchable fan there so when I go into deep water and mud I can switch the thing off to save it from damaging the radiator or itself from trying to push through water instead of air.