WATER COLLECTING INSIDE HEATER BOX on 2007 Lincoln MKZ

FOUND WATER SLOSHING AREOUND INSIDE THE HEATER BOX...HOW DID IT GET INSIDE A SEALED UNIT ??

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2 answers
sweating from the evap in the ac system. go to a shop and have them clean out the drain

Roy
And also it is not a sealed box, air has to get in there somehow.