It has to warm up, but I am not certain for how long. My guess is quite a while past accomplishing simple running temp. I think heat needs to build up in the associated parts, like the heat shield, the valve cover, and maybe especially the tube itself, which is a typically thick walled ABS plastic pipe.
EDIT: it helps that I have the grill block and ducting, so that the only air coming into the engine area goes first through the rad.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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