Originally Posted by Rusty289
Washer fluid tank is way out in the front grill of your truck, I seriously doubt you're hearing that in the cab while driving on an icy bumpy road.
If you are then you have some kind of super human K9 hearing! Lol
Seriously though, sounds like a little air in the cooling system making its way to your heater core. Check your coolant level in the overflow tank and pop the radiator cap off (Not while its hot) and make sure the rad is full. Just need to bleed the system to get the air out.
i haven't heard abut this since my 1991 Buick Roadmaster. Today's system are not like that, they get the air out themselves, as far as I know. I might be wrong...