Picked up a winter beater/dump runner/landscape supplies hauler. Has a 3.9 V6. Vehicle calls for a 195* thermostat.
Problem is good airflow from heater but poor heat. I was getting ready to back flush the heater core but happened to have my infrared temp sensor handy so I checked all the hoses.
Readings were taken after running errands for an hour (ambient temp was about 40*F), gauge is about 1/4 of the way between "C" and "H".
At hot idle the upper radiator hose reads 150-160* depending on exactly where I point the laser. The lower hose I don't recall but it was plenty cool.Heater hoses read 140* and 130* with the heat selector on full and fan on #2.
Do I have a clogged heater core or is the t-stat stuck open/missing?
