I have a leak on the passengers side of my Impala when it rains. it drips through the light below the glove box. It has shorted out 2 resistors that power the AC/Heat 1-4. It I park on a hill with the hood facing down the hill not water comes in. If I park up hill or on flat terain water starts to drip. I was told there is some form of device running from the sunroof that could be the culprit. A tube of some sort. My question is how do I get to this tube/part? A body shop wanted to charge me 100.00 dollars just to look at it. Any help would be appreciated.