98 Ranger 2.5L upper radiator hose hard
Recently had a freeze in coolant. Failed to test it before winter. Had to warm it up a couple times before it thawed so I could correct the coolant mixture.
Now, only get heat at driving rpms, not at idle...maybe thermostat stuck open?
Upper radiator hose is hard and I suspect a gasket problem.
This truck has been bulletproof for 240,000 miles...don't wish to break it now.