Where exactly is the A/C drain tube?
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You can use the infamous "Teste de l'eau"
Throw a kid under the steering wheel and close the doors and windows. Take your hose and with mild pressure, start at the bottom of the windshield and spray along the joint. Keep it to one area for several minutes (unless the kid yells that he is getting wet, then you can stop . . . ). Move progressively higher on the windshied/body joint. If you start at the top, you don't really know where it is leaking. Stay on each small area for about 5 minutes. Once you find the spot, turn it off a let it stop dripping inside, then re-test that small area again to make sure it leaks right away, confirming you have the correct spot.
Throw a kid under the steering wheel and close the doors and windows. Take your hose and with mild pressure, start at the bottom of the windshield and spray along the joint. Keep it to one area for several minutes (unless the kid yells that he is getting wet, then you can stop . . . ). Move progressively higher on the windshied/body joint. If you start at the top, you don't really know where it is leaking. Stay on each small area for about 5 minutes. Once you find the spot, turn it off a let it stop dripping inside, then re-test that small area again to make sure it leaks right away, confirming you have the correct spot.