I'm new to this room........I have a 2001 SKL-320 Sport. The warranty has ended at 50K miles (my car has 53K miles). Now, as soon as the engine starts, there's this hissing noise come from somewhere on the passenger legs area. And if I toggle with the A/C switch On-Off the noise would go away briefly and would start again shortly. It's driving me crazy.
Does anybody experience this problem?!!! Please help.

 

switchover valve leaking.

 

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