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Originally Posted by silicon212
The ID is 1/2" and 5/8".
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I'm going to install a ball valve to prevent coolant from going into the heater core in the summer. Don't have the motivation to fix the vacuum actuated valve that comes on this car at the moment.
Which is the inlet and which is the outlet on the heater core? I've got the 5/8" going to my radiator (upper right) and the the 1/2" goes to my intake manifold. I'm guessing the 5/8" is the heater core outlet? I'm running a serpentine setup.