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It's been a couple years since I took the heater box out-a my parts truck. As I recall it was super easy. Couple of hoses,couple of cables, and I think about 4 nuts on the firewall under the hood.
I checked O'reily's website and they list a HD core, it is taller, for a Dentside truck. Will this fit in the Bumpside heater assembly? The pipe connections look to be in the same location. The part number for the dentside HD heater core is Murray 399023. The part number listed for the dentside trucks is Murray 399024.
My radiator parts place asked me if I wanted the std or High Output and seeing as mine came with the factory HO unit that's what I got. Maybe try a radiator shop?
I'll see if I can find it, it was 6 or 7 years ago that I got it. Seeing as it was a factory option maybe one of our number gurus can come up with a number.
After doing some checking I don't think the dentside HO heater core will fit in the bumpside heater box. I'll order some new foam seals and replace them while I have this thing apart.
Anthony, I did some looking on the Advance Auto site there are two listed 399024 & 399023, The 23 lists for 76 and does not fit a 72 F100 (just picked one). They look the same, and I have read here that they use same through our year range.
Mr. Wilson is not posting just now, so use your own judgement.
If it's getting hot water in the box and cold air from outside isn't overcoming it, you should have heat from 24.
There is a lot of air leak in my truck and heating is harder that it once was.