stationary i would imagine it works, but the design is flawed in my opinion.

car moving, air is forced into the rad.

you fan blower is trying to blow cold air into air travelling at 70mph.

cant see if doing sweet fuck all.

sucking air away from the rad would be different but again, that ducting is on 15-20% of the rad so is using an efficient area.

all IMO, but seems pretty common sense to me.

any idea what CFM that heater blow moves? i bet its less that 50% of the standard fan