I have had my jeep for a year, but I've never really worked on it. I usually take it to the shop.

Anyways, I'm flushing my coolant. I've got the lower radiator hose disconnected for the water to drain out. I sprayed into the radiator cap to flush the radiator and it worked no problem. I then sprayed into the upper radiator hose, but instead of going through the engine, it just filled the hose up. I'm doing everything like the video I watched, but I have no idea what would cause this, and I cant find anything either.

 

Did you take the thermostat out? If not then that is your problem.