Re: 1967 with C60 - Problem removing heater box assembly from under dash
I checked the holes today on the duct-housing where the evaporator box assembly attaches, and they appear to be drilled, with sharp edges on the back side. The previous owner says he didn't do it, and doesn't remember if it was already like that or not when he removed the A/C components from the engine bay back around 1973. He understood the problem, and says it was something people did back then to prevent the evaporator core or related parts from icing over (as Ray mentioned in post #7 above).
It's possible that my father knew about this "fix" and drilled the holes, just as the previous owner was aware of this kind of modification. But my father couldn't have known whether this car's A/C system had an "icing" problem until after he reinstalled all of the engine bay A/C components. Removing and reinstalling the evaporator box while the engine is in the car cannot be an easy job. I took it off the firewall with the engine out, and it wasn't easy. Whoever put the holes in it did so for a reason, and went to a lot of trouble to do it.
It would help to understand more about the problem that was being addressed, and what the correct (or better) solution is. If I fix the duct-housing and put everything else back together according to the AIM, it's likely to exhibit the exact same problem that led to the modification in the first place.
Does anyone here have experience with this situation, or ideas about how to correctly "fix" it?
I checked the holes today on the duct-housing where the evaporator box assembly attaches, and they appear to be drilled, with sharp edges on the back side. The previous owner says he didn't do it, and doesn't remember if it was already like that or not when he removed the A/C components from the engine bay back around 1973. He understood the problem, and says it was something people did back then to prevent the evaporator core or related parts from icing over (as Ray mentioned in post #7 above).
It's possible that my father knew about this "fix" and drilled the holes, just as the previous owner was aware of this kind of modification. But my father couldn't have known whether this car's A/C system had an "icing" problem until after he reinstalled all of the engine bay A/C components. Removing and reinstalling the evaporator box while the engine is in the car cannot be an easy job. I took it off the firewall with the engine out, and it wasn't easy. Whoever put the holes in it did so for a reason, and went to a lot of trouble to do it.
It would help to understand more about the problem that was being addressed, and what the correct (or better) solution is. If I fix the duct-housing and put everything else back together according to the AIM, it's likely to exhibit the exact same problem that led to the modification in the first place.
Does anyone here have experience with this situation, or ideas about how to correctly "fix" it?
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