280 heater box in a 240?Has anyone

[Z dreams]

Has anyone tried this? couldn't find any threads on it.

[zKars]

I thinks its do-able with certain "custom" touches required. The control panels are different, and if the 280 heater box has the vacuum operated components then it will be tougher yet, as the 240 is totally push cable operated. Early 280 boxes are cable operated too, its the later ones with AC that vacuum actuated. The heater core outlets have different orientations requiring the 280 hot water valve and its plumbing/hoses, and it relys on a throught the fire wall nipple thing that 240's don't have. Get all the parts you can for that.

The center air outlet plumbing from the air box is different, but similar, again because of the differences in the heater control panel. Using some old 240 parts there may be required to mate them up.

The blower motor and housing under the passenger side is pretty identical.

The FSM's and the fiche show pretty good pictures of both as to air handling hose differences.

Space under the dash is pretty much the same, should "physically fit" back there. Only one real way to tell. Try it.

[Z dreams]

Thanks zKars,

Since I started this thread.I got my 280 heater box out, its a 75, and did some test fitting in my parts car. The 280 box bolts through the fire wall in the same location as the 240 heat box. But the 240 box has welded nut mounts on the firewall. Using the nut mounts for a guide, I drilled 2 holes in the firewall, then cut off the welded nuts, re- drilled the holes to fit the studs on the 280 box. Change the plumping to fit the 240 firewall, use 240 parts to center vent,should be good.