I have always wanted to try this theory of using your car engines heat to cook or warm food. Recently i did a body-lift on my 4wd and as the engine is bolted to the chassis, the engine basically has dropped in my engine bay. After removing the plastic cover off the engine (which served no purpose) i had plenty of room and mounting points to bring this project to fruition.
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After a bit of playing around i added a filling point. This serves to fill the heat exchanger and coolant system from the vehicle and also, as it is above the radiator now, the highest point which also is used to release any air pockets in the system.
To date this unit works great. Not as hot as i first expected, i think its because my car is a fairly modern diesel engine and they run pretty efficiently not producing much heat to start with. (its a 2.5L Turbo Diesel Nissan Navara D40) The pie warmer runs at about 45C after about 30mins of driving. Funnily enough when i turn the engine off the temp gets up to about 55C. Many times working on site we have put our lunch in there being leftovers from the night before for example and it perfect!
Thanks for reading!