The mechanic at my dealer checked it out and heater core is not leaking. He says it is wet on the right front corner of the firewall which usually means a sunroof drain or leaking windshield.

Car has original windshield and mechanic poured water down sunroof drains and it came out on bottom of car as it should.

Any tips on finding this leak??

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup