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Depending on the diameter, I think you can sub those for bleed valves. But given you don't have one, I'd do as suggested and just crank it open.
If it doesn't seal again, I'd try PTFE tape first. Maybe six wraps or so. Very slow leaks are sometimes remedied by time since you get corrosion and sludge which helps to naturally seal.
rodabod
JesperXT
Sorry for crossposting, but:
The building manager has asked us to vent our radiators. Mine are old cast iron ones without a regular air vent. Is it just a matter of taking a fitting wrench and carefully loosening this: