Jim S

I have my evaporator core out for repair and your photos of the HVAC box are a BIG help thank you.  One question pertaining to the blend door to the left of the evaporator core.  My actuator was missing and I found a replacement. When vacuum is applied and the actuator pulls, which position should the blend door be in? Should it close the top opening above the heator core, or close the opening when air flows under the heater core.  I not sure which way to mount the acutator as the old one has been long gone.  Thanks!