"Heating & Ventilation" - Not Included in Bentley's Manual

[vesnyder]

I am debugging a situation where I am getting burnt oil into the cockpit and am looking for a schematic of the heating and ventilation in my '83 SC. For some reason my Bentley's Service Manual is missing the Heater and Ventilation sections - only includes Air Conditioning section. Anybody have the schematic of the ventilation and heating air flow? I've owned my Bentley's Manual for more than ten years and never realized there were sections missing?