Heater Doors

Inside the cab...appearance, repair, upgrades

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m9452p
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Heater Doors

Post by m9452p »

I'm going to rebuild my heater. There's been a couple of great write ups on here prior. Thanks to those that did the work. Great articles with lots of details. I understand that the big flapper door directs air to the defroster vents, but what is the small one beside the fan supposed to do ? Maybe I'll understand after I get it apart?, its not like they're sealed off to other areas or chambers. Thanks
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sargentrs
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Re: Heater Doors

Post by sargentrs »

The big door directs the air to the defroster, floor vent or a mix of both. The small door blocks the blower fan and heater core off entirely and just allows fresh air through. https://fordification.com/forum/viewtop ... =6&t=73960
Randy
1970 F100 Sport Custom Limited LWB, 302cid, 3 on the tree. NO A/C, NO P/S, NO P/B. Currently in 1000 pcs while rebuilding. Project thread: http://www.fordification.com/forum/view ... 22&t=59995 Plan: 351w, C4, LSD, pwr front disc, p/s, a/c, bucket seats, new interior and paint.
1987 F-150 XLT Lariat, 5.0/C6 auto.
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