HELP! 90' Cooling Problem

I have a problem with my 90' Cherokee I have yet to figure out. Whenever I drive it, the pressure in the coolant pressure tank gets to high and leaks coolant through the bottom return hose. It also leaks from the tank while driving. I replaced the thermostat, water pump, pressure tank cap, and flushed the system with radiator flush, but the problem still exists! Any ideas? Please help!

Coolant is supposed to get pressurized when driving. Thats why they say never to open the coolant fill cap when the vehicle is hot after driving. It will explode all over.
SOunds like you have some bad hose clamps and fittings. These are cheap. Get some new ones and put them on, and see if that fixes the prob.

from you posting you may have two problems.
the coolant pressure tank gets to high and leaks coolant through the bottom return hose
1. you have too much coolent in your system. I am not 100% sure because I don't really know what I coolant pressue tank is but if you are referring to the overflow tank then you deffently have too much coolent.
2. leaks. someone already gave good advice there. get some new clamps and hoses and clean it up.

Coolent is going to get hot and expand. therefore it will boil over from the radiator and cooling system to the overflow container. if it is overflowing that then you have too much coolent in there. if the coolent is leaking after it is hot then you need new hoses and clamps after replacing the parts you have already mentioned.

Good luck &

Keep on Jeepin!

Sounds like air! Burp your system!