Wow - you've got some work cut out for you....

#1 & #3 can go together. #1 is showing a check valve that is obviously blocked off to prevent the loss of vacuum. It should go on the two yellowish lines showing in pic #3. Might be best to leave this until you have researched door lock vacuum troubleshooting. Searching is your friend.

Looks like your alda has been disabled so banjo bolt line won't be required for anything (IIRC). Probably not a priority. can't help with heat exchange but suspect this will be no small task.

Pic #2 is a OEM block heater plug. It is impossible to see from topside with the aircleaner attached. From the bottom, just ahead of the starter, IIRC, you should be able to spot the connection for the plug. I would suggest using an VOM to verify continuity with the ends of the plug before messing with it. Also checking the business end at the block - but you can also check that by plugging it in.

I let others contribute. Best of luck.

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83 300d - 390k