I believe you may be referring to the condensor drain which you will find
coming through the firewall. It's a rubber hose that is maybe a foot or
two long. It should have water dripping out of it when your ac is on. If
it is clogged, the water backs up and leaks into your car through the
heater compartment. To clean it, look in the end of the hose and stick a
small stick or screwdriver into it until the water puors out.
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