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1990 944S2 A/C Recirculation function

Heating and Ventilation

Vehicle Information: Model(924/944/968): 944S2; Year: 1990; Body Type: Cabriolet; Total Mileage: 32000;

I had noticed previously that when I used the A/C recirculation function via the button on the dashboard I would hear a noticable thump (like a door closing in the A/C) and the blower speed increasing - resulting in cooler air at higher speed (as I would expect). Now, when I press the recirculation button I hear nothing and notice no change in A/C performance. What is the most likely cause of this problem? Is it the vacuum unit? Blown fuse (I looked for one that might control this function and couldn't seem to find one)?

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