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Hissing Under Dash - Air Con?

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Hello all,


Looking for some advice. My Mondeo mk4 has recently started making a hissing (best way to describe it) noise coming from under the dashboard. It stops when I turn the air con off, and returns when I turn it on.


I bought the car in August last year, and had the air con re-gassed, it is likely the issue is with the evaporator? Its difficult to tell, but I'm sure the air con still works and I haven't smelt air con gas inside the car.


Your thoughts are gratefully received.



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