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1990 944 S2 Air escaping noise from AC

Heating and Ventilation

Vehicle Information: Model(924/944/968): 944S2; Year: 1990; Body Type: Convertible; Total Mileage: 73000;

The AC has started making a sound like air escaping that pulses at idle and becomes loud when the AC is turned off. The AC blows cold and at the last service (70K) did not need to be topped off.The sound is coming from the lower left side (passenger) of the engine compartment

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