Hi I have the 2012 Mustang GT. After it rains there will be a small amount of water build up in the left wheel well in the trunk. I saw in another thread a month ago that this is normal, but there's a way to seal this off. Anyone else experiencing some water build up in the trunk after it rains? Is this normal for our cars?

 

My 11 GT/CS stays dry in the trunk....yours is not normal.

 

had that on my mustang after heavy rain. it's leaking in from behind the taillight. there is a square hole with some plastic clip in it or something. seal that up and problem is fixed. don't ask me to explain further this was 2 years ago and I don't remember exactly.

if you want to be sure, take out the mat and plastic cover from behind taillight and duplicate conditions with a hose. you will see the water trail. do both sides while you're at it.