Redesigned modern evaporator has 35% MORE PASSES, using three-circuits, instead of the original single-circuit design. This is a direct bolt-in replacement and requires no modification.
As far as evaporators go, we highly suggest going with a good used evaporator over these new versions. What happens is this: These companies use more coils (35% more passes) which equals out to thinner metal. It has been our experience that these often fail within a few years. We suggest flushing and pressure testing your original evaporator. Even if the connection ends have been twisted off they can be reattached.
Check out our videos below on how to replace a heater core and A/C evaporator!