Heater Ductwork
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New User
Joined: Nov 2008
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Heater Ductwork
Hi-
I am a new user here, Live in KY where very little rust attacks our vehicles. We inherited my late father-in-law's 1979 F150 4wd longbed, 351M / auto, 63,000 original miles. Dual front shocks, dual tanks, stock steel wheels. No exterior rust, but alot of surface rust underneath from living its whole life back home in PA.
I am replacing the heater core, but cannot find the last couple of mounting screws (above the tunnel, supposedly) to remove the main plastic ductwork box. HELP?!?!?!?
We are treating this one as a family heirloom. Already have replaced the radiator, water pump, master cylinder, rear brakes and wheel cylinders. Dad hand-made a front push/light bar, Class 3 hitch, and stainless running boards for it. He owned it from 1980 until he died in 2005, garaged it the whole time. Plans for it include new SS brake lines, new front tank & bracket, and alot of elbow grease underneath.
Thanks in advance for any help on the heater ducting.
Dick Peoples
I am a new user here, Live in KY where very little rust attacks our vehicles. We inherited my late father-in-law's 1979 F150 4wd longbed, 351M / auto, 63,000 original miles. Dual front shocks, dual tanks, stock steel wheels. No exterior rust, but alot of surface rust underneath from living its whole life back home in PA.
I am replacing the heater core, but cannot find the last couple of mounting screws (above the tunnel, supposedly) to remove the main plastic ductwork box. HELP?!?!?!?
We are treating this one as a family heirloom. Already have replaced the radiator, water pump, master cylinder, rear brakes and wheel cylinders. Dad hand-made a front push/light bar, Class 3 hitch, and stainless running boards for it. He owned it from 1980 until he died in 2005, garaged it the whole time. Plans for it include new SS brake lines, new front tank & bracket, and alot of elbow grease underneath.
Thanks in advance for any help on the heater ducting.
Dick Peoples
Laughing Gas
Joined: Dec 2007
Posts: 796
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From: Minnesota
Does it have a/c? The non a/c ones I have removed a few times by removing the whole unit like you are doing. Mainly just have the 2 cables to undo, some wire connections, and 3 or 4 screws that go through the fire wall. Don't forget the one bolt that goes through the fire wall right behind the motor. Also I took out some dash bolts on the passenger side to get some more clearance when removing the unit. It's been like 2 years since I did it but hope this helps. It's kind of tight between the floor and the dash but it will fit if position the correct way. Move floor mats and have the dash loose to get more room.
Senior User
Joined: Nov 2007
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On my 78 F250 w/o AC there were three studs holding the heater box to the firewall, two at the fan motor and a third at top of tranny tunnel. It's a tight fit getting the box in and out.
Sounds like a nice truck and it's cool that you have kept it in the family.
Sounds like a nice truck and it's cool that you have kept it in the family.
Thread Starter
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New User
Joined: Nov 2008
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Heater Ductwork
A huge thank you to those who replied and helped on this. Yeah, it's a no-A/C truck. I had a feeling that those 3 studs on the engine side of the firewall had nuts on them beneath what looks like silicone rubber. It has occurred to me that at my age (53) I should go ahead and replace the blower motor while I'm in there - Won't have to worry about that one again in my lifetime! The lucky nephew who is next in line for the truck will.....
Thanks again for the help on this.
Dick Peoples
Rush, KY
Thanks again for the help on this.
Dick Peoples
Rush, KY
Elder User
Joined: Jul 2008
Posts: 899
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From: trenton ns canada
I have just removed and reinstalled my heater box on my 78 w/o air due to a leaking heater core and I also had to take of the passenger side vent to get the thing out,maybe it wasn't needed but it seemed to make slidding it out alot easier.
