The fan shroud is critical only at idle, by ensuring that all the air that the fan sucks is coming from in front of the radiator rather than through the sides. If you don't drive your car in rush hour with AC on, you may be OK. If you are in doubt, install one of the mechanical temperature gauges (at least temporarily) and see how its doing. D^2 Quoting John Carnduff <tahoe8798@xxxxxxxxx>: > Fellow Members, > If my 1966 Imperial does not have a fan shroud, > is it a given that the car will overheat?