what will cause mold to grow inside my 2009 Jeep Liberty

Mold grows for the same reason it grows anywhere. Water or lots of moisture is getting in. If you have noticed water coming in during rains this will do it. Usually starts in the carpet. Alex

It been a very rainy summer - that also means less sunshine to help prevent mold growth .. Keep in mind condensation as a result of the interior heating up then cooling down is also a contributing factor. There are a few YouTube videos showing how to clean and prevent mold growth posted by automobile detailing professionals.