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Also keep in mind that the engine doesn't produce much heat at an idle, so none of these will help tremendously. Installing something to increase the idle might be the best option. Tow trucks use them for the hydraulics, or if you wanna go cheap, you can cut a 2x4 to size and wedge it between...

You should also check if your thermostat is closing at an idle, chances are it cycles between open and closed. Check the pressure by squeezing the main feed from the top of the engine to the top of the radiator. If its firm, the thermostat is open, if soft, it's closed. You can get...

First off excellent work!!! You inspired me to FINALLY become a member :) In regards to your heater issue at idle, I would start by insulating both the coolant lines from the engine bay to the truck bed. This should help just a little bit. It's difficult to see how you tied in to the cooling...