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If it's not sealed to the air cleaner it can reduce the air drawn through the radiator a wee bit. It shouldn't make more pressure than the air moving through the grille.

Electric fans with shrouds? What kind of fans? Some of the cheapies (and not so cheapies) don't flow enough air to keep up with highway speeds.



Unfortunately I don't know what kind of fans they are. I bought the system here from a Moparts member. I would think I wouldn't even need the fans at highway speeds. When I turn them off the temp doesn't change (on the highway).

You are right in most cases you would not need a fan a highway speed as the forced air is plenty but in this case the fans may be blocking the flow at highway speeds. Adequate air flow at hiway speed may also depend a lot on the RPM's turned at said speeds.