non-AC heater on an AC cab

[68C15]

a guy I know (my old neighbor) needs heat. the evaporator box is missing. I think I have a regular heater box I can give him but I need to know if it will fit.

BTW, it is either a 69 or 70, not sure which one though.

[LockDoc]

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I don't think so but I have never really tried it... I know the openings in the firewall are different and the heater core is inside the cab on the A/C.

LockDoc

[clay68c10]

Yup, boxes/openings are different and the core is inside. Someone makes a bypass duct, but maybe a guy could come up with something at home in a pinch. You just need air to flow from one opening to the other on the firewall.

Here's a link:
http://www.acdelete.com/pages/67-72_Truck.htm

[mrein3]

Originally Posted by 68C15

a guy I know (my old neighbor) needs heat. the evaporator box is missing. I think I have a regular heater box I can give him but I need to know if it will fit.

BTW, it is either a 69 or 70, not sure which one though.

If you have an afternoon to kill it might be worth a shot.

I would plug the heater hose holes with a fabbed up plate. Then I would attempt to cover the part of the AC hole furthest from the tranny tunnel that isn't covered by the heater box. This piece might be the same plate to cover the AC style heater core holes. Then bolt on the non-AC heater box. You'll have limited heat flow through the firewall but limited heat is better than no heat at all.

If you are doing it permant like you can use the parts you got to make sheet metal pieces you can weld in the firewall. A few years ago I went the other way making my non-AC cab work with factory AC parts.

You make paper templates by rubbing a pencil on the firewall and the heater box. I marked up the famous AC vs. non-AC firewall picture to help with lining stuff up. You simply need to do the inverse of what my marked up picture states. Cut out what I welded in, and make and weld in what I cut out. Make sense?

I'd try it first with a simple sheet metal plate roughly covering the AC opening.