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My split system heat pump decided to start leaking, but I didn't know it was leaking until my floor started to sag a bit. I've cut into the linoleum and the subfloor is wet. The vinyl plank flooring in the dining room (which is right on the other side of where my hvac is, was pulled back today and it has mold growing underneath it. I'm thinking that it's an area of 5'x5' at the most that will need to be replaced. We're going to replace the subfloor, but what can I do (in the meantime) to try to kill some of this mold?
Use Vinegar or Borax to kill mold. Bleach does not kill mold. A lot of people think it does because it bleaches the stains and makes them 'go away' - for awhile - but bleach has problems (surface tension) getting to the mold 'roots' because they are too long and bleach is too corrosive.
Spray or pour white vinegar (from grocery store) on mold and let it sit there (wet) for 30-60 minutes. Rinse with warm water and allow to air dry (important). Afterwards, you can use bleach to remove any stains.
(Bleach does kill mold on non-porous surfaces - think porcelain - not caulking, floor or wall around bathtub.)