Hey I have a 86 5000qt that has a water leak in the front. I noticed under the floor mats it was moldy and damp. Any thoughts as towhere I can look to fix it? My imediate thoughts would be the Sunroof drain but past that I'm clueless.

Thanks
CDC

Clean the leaves out of the area where the blower assembly is located. Also it could be your heater core if you are using Pentosin (blue colored) coolant.

Thanks for the info. I will remove the the leaves. I know my heater does not work nor the AC. Where would I look to fix the heater. I am getting a Bently repair manual so with your input and the book I might be able to fix it.