Strippers, boots, and blowers.

I got your attention.

*I stripped the paint off the trunk "boot" lid, the blue paint came up immediately, most of the mallard green came off without any difficulty.

Crappy respray

Came out better than expected

Pre strip

*Took the heater apart to clean and paint, most of it went well.  I noticed the blower fan wouldn't spin one revolution by hand so I broke into the casing. 
There is a clip that holds the fan cage onto the shaft that wouldn't let go. I tried tapping the shaft out of the fan and ended up cracking the fan cage.  Figures.

The wires unplug from the end case, take note what side they plug into.
mark a side of the case to keep it aligned.

(2)  nuts come off, then the rear cover comes off.  Try not to lose the 3 shims that go on the shaft near the armatures rear.

This exposes the brush plate,  my brushes were in great shape. :)

  Clean out the rear bronze bushing, then I put some silicone grease and a drop of synthetic oil in it.

Remove the brush plate, don't lose the 2 spacer springs off the bolts.

I found that the armature contacts were tarnished, so I used a scotch brite pad ( fine sandpaper does the trick too, just make sure its clean afterwards)

The entire armature would not pull out of the front fan-side bearing- probably why the fan cage wouldn't come off either!  So I worked some synthetic oil down around the bearing and it started turning a lot easier.

To put it back together: put in the 2 case bolts, the brush plate around the shiny armature contacts,
the motor mount ring noting the little alignment tab, I put a tiny dab of silicone grease to hold the 3 shims, then the rear cover, lock washers and nuts, and plug in wires.

After this, mine would hand spin over a revolution without the fan on it. 

Test it out to make sure everything works.  Mine is quieter, probably because the gravel is out of it.
The shaft, while looking at it, should rotate "anti clockwise" or counter clockwise as marked on the fan .