Two possiblities, either your heater core has a leak and needs to be replaced, or your AC condensation drip tube is clogged and the condensation is backing up into the interior.
I would pull back as much as you can and run a fan in there with the windows down so the moisture can escape.
This member had a similar issue and came up with this:
"Just a follow up, as I found my problem and it was an easy fix.
abomb4601 and a couple others called it, was a bad plug connection.
I had replaced all the plugs and wires less than a year prior to the issue, so I kind of discounted that...
Code 95 is fuel pump circuit issue.
Code 87 is fuel pump circuit intermittent.
I would check the fuse/relay box for corrosion on the backside of the plug ins, and also recheck your connection at the fuel pump.
I just had to comment on the red oil can in the photo. A couple weeks ago I was filling the OD unit of the Dart with an oil can like that. I need the flexible wand to reach the fill hole. The tip of the wand broke off and fell into the OD unit:eek: Had to remove it and pull it all apart to get...
I bypassed the switch panel and the pump worked fine. I've already replaced the defective panel and all is well with that now. I just shipped the carburetor off to Pro Systems today so they can make the Dominator carb more streetable. It was previously optimized for wide open throttle operation...
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PATS key success! Thanks Forscan