1. Some of the parts have become unavailable or extremely pricey.
2. From its exposure to the elements and potentials it has a lot of rust after 40+ years
3. It is in an awkard location and many have to come out to grant access so you want this done right not to have to revisit.
Let's look at this point by point :
1. Luckily i had 3 used boxes and had to mix and match parts to make a good one. Only one of the 3 heater cores had no leak (tested submerged in water with air pressure). One of the 3 had a stronger and nicer working flap system. Had had a good motor.
2. Cleaned the rust and sprayed gloss black. Now as i said it is exposed to the elements so you want to try to get the seals replaced but they aren't made anymore. Escpecially the one that fit around the entry / exit hose. The old ones have become hard and brittle and resemble cookies that have forgotten in the closet. In the end i made my own using house pipe insulation and it looks good and seems functional. Used window seal tape to create the seal around the fan hole.
But double sided foam tape as well where the core touches the body as the original one had clearly disintegrated.
3. Install and pray
Photo below of the heater ready to be installed, tada !
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