If both heater core hoses are equally hot, then that indicates that the heater valve is working and that the core is not clogged. Basically, it implies that the problem is elsewhere. Maybe it is in the blend air door actuator(s), the blend air door itself, or the HVAC control unit (the control board in your console). The blend door (aka air mix control door, as Honda calls it) basically directs the incoming air either to heat it or cool it, depending on your choice. It is not uncommon for the actuator that operates those doors to go bad and have the door stuck in whatever position it happens to be in at the time.
I am attaching a diagram indicating where the air mix control motor is on the HVAC assembly box and some instructions on how to test and replace the motor. If you can get to the motor, then run the test on it and let us know the results. The HVAC box is located behind the center console. Unfortunately, I do not have much information on how to access the air mix door motor or anything like that, so you will have to wing it.
Also, if your van has a navigation system, or a dual zone climate control (where the front passenger and driver can have different temperature settings), then please let me know that. I may have to do more research to get you the correct information. And the VIN# would be helpful too. Thanks and good luck. Let us know what you find.
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Tuesday, December 11th, 2018 AT 12:07 PM