1998 Dodge Intrepid OVERHEAT Issue

I have a 1998 dodge intrepid…. 85k miles… 3 days ago it started to run hot….
PLENTY of coolant… I thought thermostat at first… So i checked the upper and lower hose… Upper house is getting WAY hotter than the bottom.. and it has pressure on it…. So that tells me the thermostat isnt locked up…. But i also noticed it only gets under TIGHT pressure once it runs hot… … i cant feel liquid flowing through it.. but it gets hot and under pressue…. My fans are turning on and working right…. the 2 things i narrowed it down to are water pump or head gasket… butno signs of a head gasket… at this point im stuck… any advice???