Mine was an issue with the AC there’s a hose that was pushed against the firewall and it would fill with water and fill back into the truck but there’s multiple issues it could be. To me it sounds like it’s your windshield it probably has a leak.
Common reasons for the leak
AC hose...
I recently purchased a 2020 F-150 this truck has 1XXX miles on it. While driving home from the gym today I could hear the sound of water splashing back and forth but I knew for a fact there were no loose water bottles laying around. ( I baby this truck). well upon closer inspection when I got...