Climate control issue on 82 300d.
Econ setting and fan on I get only hot (engine temp) air coming in. It should be bringing in outside air.

It's probably been discussed earlier, but I can't come up with good search terms.

Any help/advice greatly appreciated.

monovalve

Econ will only bring in ambient air plus whatever heat bleed-through from the engine. If you want cool, you'll need to push the AC button. Monovalve could also be a problem, too.

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1987 300DT
2002 Ford F-250 7.3 Crew Cab Short Bed