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where can i find the drain for my air conditioning evaporator ? water leaks inside the car

 
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it could be your heater that leaking,

 
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You better hope it's your air conditioning evaporating if its anti-freeze your heater core is leaking. You have to pull the a lot of the dash board out replace it (really not that fun). If you don't have the money/skills you can bypass it (take the two heater hoses that go in to the fire wall and connect them together).