Variable speed control (NOT constant, as mentioned in your initial post) would produce the same effect as cycling on and off but with even more precision, which would keep the coolant temperature in an even tighter (constant) range.
"The two seater is being joined in a few weeks by a larger two-plus-two model with a rear seat for munchkins." ~Jim Mateja, Chicago Tribune, in regards to the Z32.
Andrew Janeshek // jnshk@aol.com // 1992 NA 2+2 [Stage 2-ish]