Where is the end of the Condensate Drain Pipe?
'Can you access it?

Example:
HVAC system in this house is in an interior closet (Evaporator and Gas fired H.E.).
The Compressor is outside.
The Evap Pan Drain is 1" PVC THAT GOES INTO THE CEMENT SLAB AND COMES
UP [VIA a PVC "Gooseneck" ,Removable] outside next to the Compressor.It's
ALWAYS full of Condensate!!! Every couple of months it gets 1 teaspoon of
Bleach @ the interior drain pan ,and even then sometimes "Snot" grows in the
underground portion of the PVC.

Enter the Shop Vac. Small Vacuum hose Duct taped to the outside of the
PVC drain line ,Apply Vacuum.
Apply Hot Water Flush with a funnel and 3 gallons of boiling water to the Interior end of the PVC Pipe.
Problem Solved.

BIL' s old house,in town, had the HVAC unit in the attic with same sort of PVC
type drain line.The HVAC unit sat in a 6" high Tin Condensate Pan.
Same Problem.Same Solution.

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'84 300SD sold
124.128