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you almost definitely have air in the system. There's a bleeder screw on the water neck, take it out, start the car, turn on the heater, and keep the radiator full of coolant while coolant gets pushed out of the bleeder. You'll see a bunch of bubbles at first, then it'll be a solid stream.
Then put the screw back in, but be careful, that coolant will be hot.
Edit: buy the S14 water neck from a Nissan dealer, or find a used S13 one for next to nothing.
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