C280 Climate control vacuum leak?
I have a 1995 C280. When I start the car, there is what sounds like a hissing/vacuum leak under the passenger dashboard. The sound goes away when I turn on the heat, but I can make it come back on by either shutting off the heat or by initiating the recycling air feature (turns off the air coming in from the outside). Is it a vacuum leak and if so, where should the line be to reattach it? Thanks.
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