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In general, the untimate temperature a system like ours can attain is limited by the temperature of the air outside. The typical refrigeration system can remove enough heat to lower the temperature inside the vehicle by 50 Fahrenheit degrees or more. You do not say what the outside temps were like during your experiment; certainly BC is not AZ. Switching on the "recirculation" should also make it possible to attain a colder ultimate temperature. It is possible that "too cold" could block airflow through the climate control system by freezing atmospheric humidity. Obviously that would depend on the humidity in your area. I do not think that any harm would come to the system.
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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