I have a hellacious smell coming from my passengers side floor board. it smells like wet stank... thats the only way to describe it. I ran a hose over the truck and its not leaking anywhere. do you think it could be the heater core clogged up and backing up in the floorboard of the truck.

 

That's what it sounds like to me. Sorry to hear.

 

check to see if all the plugs are in the drain holes.

 

the heater core has coolant in it, youll smell sugar, if the heater core is pooched youll have coolant in your truck, look at it, do you see crustys on it? if so its leaking, do you have carpet? im thinking you do, you may just have it very wet...a cat may have sprayed under your truck and your smelling it on that side of the truck, maybe hit something dead on the highway? is there a dead creature in your truck IE mouse etc...start taking things apart only way to find out