If you've not been consistently using your air conditioning over the winter months you may not be aware condensation in the pipe work combined with heat from the engine can create a breeding ground for bacteria and mould. Switching your air conditioning back on could lead to:
Air conditioning is not part of the schedule service routine but is not maintenance free. Peugeot recommends that air conditioning is checked and treated on an annual basis.
Air Conditioning Check at Alan Milne for only £29.99.