Water Leak Test

[Ridgetalker]

The weather guru's are calling for 3"-5" of rain this weekend in Louisville. In fact, it's raining right now. I just backed my RL out of a perfectly dry garage and parked it at the back of my driveway. I'm going to let it sit there all weekend and see if I have any leaks. After many carwashes, no leaks to report yet.

Do you guys think this is a valid test, or do I need to be driving it in rain for the leaks to show up? Thanks.

[Rick Walker]

You might be able to test the C-pillar leak by just letting it sit in the rain (if the truck is sitting at the right angle; can't remember for sure but I think the nose of the truck needs to be elevated), but in most other cases (A-pillar leak, and other undercarriage leaks) water needs to splash up from underneath the truck for some time before finding its way into the cab.
There is a specific leak test for the A-pillar leak spelled out in the TSB. Not sure if other leaks have such definitive tests though.

[Ridgetalker]

Thanks R W

[ninefive0]

Pop the hood and you will see an opening in the fender wall towards the rear of the engine bay. This is where the water gets into the fender. Take a garden hose and put water in through this hole and you will test the fender drain. Very quick and easy to do.