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I'm not sure if my heater hose mod is what you have in mind, but here goes. I bought a Four Seasons valve from Autozone a couple years ago and spliced it into my heater hoses. With it I can let coolant circulate as normal, or I can return coolant directly back to the system and bypass the heater. It's actually a factory Jeep part, vacuum actuated. I did it to improve my air conditioner performance, not to speed warm ups.
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