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AC/4X4 vacuum leak?
I've read a ton about this issue but still cant identify my problem. '01 excursion 4X4 shift in the fly. My heat and A/C only vent through my defrost. SOF does not engage my 4X4. If I lock my hubs manually and shift the SOF switch, I have 4 wheel drive and heat through any vent selected. Hubs locked and in 2H mode, heat defaults back to defrost mode.
If I disconnect and plug the vacuum lines at the hub still defaults to defrost.
Brand new vacuum pump installed, hubs removed, inspected o rings and greased.????