Acura Repair Questions? Ask a Mechanic for Answers ASAP
The coolant runs through a valve for the front heat and not for the rear. The first thing I would check is if the valve is operating properly. You can do this by watching the arm on the valve for movement as someone inside turns the heat from hot to cold. Watch and make sure the screw in the center of the valve also moves. If the screw does not move then the valve is bad. I have seen many of these valves go bad.
Yes I do agree that you have found the problem. That is exactly what I was referring to.