Start by checking the coolant level when the engine is cold. If that's ok you may be having an issue with a blend door actuator or door. These are located behind the dash and control air flow through the vents.
Alex
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The car is warm it blows cold on the passenger side it does have duel climate controls
did you get it to work? My fiat500L has the same issue. Let me know! thanks!
hi Alex, thanks for your answer, so in this case we need take the whole dash out to repair or replace it?