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Car: XC90 2.5T AWD 2003.

During this years hot summer I noticed that the A/C and fan seems to work fine for only 30-40 minutes, after that I hear that the fan is still working ( and I can adjust its speed manually) but almost no air is coming thru any of the ventilation holes.

When my car was in for its regular maintenance service last week they checked but couldn't find any fault codes so it wasn't investigated any further.

Any suggestions how to continue?
 

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I noticed that the A/C and fan seems to work fine for only 30-40 minutes, after that I hear that the fan is still working ( and I can adjust its speed manually) but almost no air is coming thru any of the ventilation holes.
One reason this can happen is if the evaporator freezes up. The ice blocks the air flow. The cause is generally low side pressure too low, although a faulty expansion valve can do the same thing.
 
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