I have a 78 F100 that I would like to take the AC unit off the fire wall. (Its in the way) What problems am I going to run into.

 

You need to find a donor truck with the heater assembly if that is what you would like to go back to. you ll need the wiring, plus all the heater parts, and the firewall is different, so alittle cutting and welding has to be done.

Im in the process of doing the opposite, adding a/c into a truck that didnt have it.

 

To delete AC, a donor truck with the heater and stuff is a must if you want heat and defrost and dash controls. A section of the firewall with the smaller round holes or a template of an original will be needed so one can be made, you could perhaps rivet it in with many stainless steel 3/16" rivets (use air rivet tool) and seal with silicone if you didn't want to weld it in.

If you care not for them, you could build a box inside the pass side cab with heater core and fans ... if talented with wood and'or metal crafting, or fibreglass. Early cars had "add on heater" that were esentially boxes with the core and fans in them, I think you can still find them in camper supplies and JCWhitney.

I did it the other way 'round about 15 years ago on my '77 as below. (I've had it since '86, it has 99,XXX miles last I looked, it does what I want and I like the looks of it when it looks good ... I am going to get around to installing those new bedsides, doors, tailgate, trim that I have been collecting over the last few years ... she's getting new wheels and tires then too, and maybe that 400 that has been on the stand too long ... this year)
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I have finnally got time to work on the conversion. It has taken some time to do but I am on the down hill side of making the change. One of the things that has made it easy is I had removed the front clip from the truck. I was told that I would regret starting it and so far not yet. When you do something like this you dont know what your getting into until after you start. The dash had to be taken apart in order to do it right. I should have the dash and heater assy back together by the end of the week.

 

Glad to hear it is going OK. Get some pics of what you are doing and put them in a gallery. When you are finished post a notice in the completed projects thread.

 

My suggestion would be to keep all of the A/C parts you removed. There are those out there who will pay good money for those parts if they're still in good condition (or even if they're not). More people do the opposite of what you are doing.

 

The only part that I missed up was the unit outside the firewall. I cut the flange off of it to use it as a template for the piece of metal to use to mount the heater assy. on. Other than that all other parts are in good shape if you know anybody interested in them. I have everything from vacum hoses, dash contols and all duct work.

 

Please use PM or email to discuss part trades etc.

 

I am just wondering what the A/C was in the way of? By your user name I take it you are putting a 429 in a 78 2WD? Was the valve cover in the way with the A/C box? I put a 429 in my 79 4X4 and kept the A/C.

Open up your PM or PM me so I can discuss the A/C parts you have leftover please.

 

Are you setting down? I installed the engine in the truck to drag race it. I always kept the truck clean, it was my first vehicle. Racing got to be to expensive so I put the truck back on the road. The truck has been garage kept for the past 20 years and I would take it out on some weekends as long as weather was good. So I took it to some truck and big rig race/shows and went to race just for fun and also show. One of the downfalls of showing the truck was the engine compartment, I left it like it was. I went through three rounds of eleninations and the starter burnt up at the last show I went to. I went to replace it and the header was in the way. So I figured I would just do some other things while I was doing that and one of the things I always wanted to do is remove that mess off the firewall. I didn't know that it was going to be that envolved. (I was warned.) Since I didn't use AC anymore it would be a whole lot easier to work on it if that stuff was not there. All of this will look great when its back together. Hopefully soon.