One of the first things I did this winter was remove and replace the heater core and heater motor in the van. The motor was squeaking and the core was leaking.
Not a job for the faint of heart, it took me three weekends to get it all apart and then all back together again. Surprisingly I had no screws left over when the job was done. This was because I labelled everything and put all screws, bolts and connectors into separate baggies for later installation. I also labelled every wire otherwise I would have forgotten where they connected back up.
The first part of the job was to remove the seats. This helped in giving me easy access to the dashboard and left the van looking very empty.