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Not sure what applies differently to diesel, but here are some of the things I've done to my Neon...
1. Insulate hood (Used 1" XPS and expanding foam in the bracing for maximum R-value)
2. Seal up the hood and upper engine bay
3. Block heater
4. Oil pan heater pad
5. Misc (Grill Blocking and Warm Air Intake)
Here are things I'm planning to do...
1. Further seal engine compartment
2. WAI -> Controlled HAI
3. Insulated Coolant Storage System (current project)
4. Active Grill Shutter System
Right now, I still have some bad seal on the sides of the hood. The hood itself is well insulated, so you don't feel it warm to the touch after driving then parking, but between the fenders and the hood, you can feel the heat escaping there.
I've also dumped some expanding foam where I could under the hood (such as, between firewall and strut housing, along fender sides, etc.) to further insulate.
The insulated coolant storage system is what I'm really banking on. I'll have 0.645 gallons that'll be stored in a container sealed up in 1-2" of insulation on all sides. Just over 1/2 a gallon doesn't seem like much, but should be sufficient in raising temps after sitting w/o the heaters going prior.
I've also considered some sort of solar powered pump, painting my hood black, running some lines under it, and then tying that into my coolant system, but wouldn't be effective in shade or much in the winter.
Hope any of that helps!
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