i have a 1998 dodge ram 1500 5.2L i've replayed the t-stat, rad, heater core on 1998 Dodge Ram 1500

and the water pump and the upper hose is hot and the lower hose is cold. it sounds like a flow problem but can not find or know where to start. still has heat but temp gauge not reading right.

by in Clayton, NC on November 06, 2011
2 answers
ANSWER by , November 06, 2011
Take out your t-stat to verify that you don't have plugged up water jackets in your engine. The coolant should really flow. I have also seen an after market t-stat not flow properly, so be sure of that. If the coolant flows and both hoses get warm-hot, then you may have gotten a defective thermostat.
ANSWER by , July 08, 2014
Your heater core is plugged. Reverse flush it with water and air. I have done mine a few times now. I get pieces of gasket looking material out every time. Works great for about a year and then I do it all over again.