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Been lurking but this is my first post. I recently bought a 1977 F250 Custom 2WD w/ 351 and no AC. I replaced my heater core and the blower motor today. I noticed though, that the Y-shaped vent that goes up to the defrost openings doesn't connect to the actual heater box. It seems there is a short square shaped length of duct hose that goes between the Y vent and the heater box. Does anyone have an extra, or have they found something that works instead?
I also just noticed that the whale tail for the fresh air heater box is 100% different from the A/C whale tail (Top "Y-shaped" plastic to defrost the windows).
This conversion from A/C to just a heater box is going to be harder than I thought!
Sounds like you need a part#18490 without part # 18547....
Or 18490 that has a different lower end...
You're correct on both accounts, also correct that either could work.
I'm debating modifying the heater box completely as this retro-fit isn't turning out as easy as I thought it would.
I can see now why many of you have deleted the A/C box, mounted an A/C block-off plate, and called it a day...
However... I need heat lol. Canada is cold!!!! especially in Saskatchewan!
I might do a write-up on my mods so that everyone can get a view of how I did it, what tools, the modifications, etc. Wondering if anyone would even use it tho lol... Lots of you guys seem satisfied with no heater in your truck.
