There are a couple places in the joint between halves where you can put it
through with the heater apart. If you are not too picky about fine temp
control you can leave it outside somewhere out of the way, maybe in front of
where it blows hot air, till you find yourself doing routine heater maintenance,
(sanding and painting the box, cleaning it out, etc)
This is most easily done with the engine OUT. In fact it is nearly impossible
with the engine in.
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George Downs Bartlesville, Heart of the USA!