No heater

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.

Check coolant level first. Check to see if your air mix motor works and or the linkage has fallen off check mode door for proper movement. Check out the diagrams (Below). Please let us know what happens.

Hi ghondaw,

Check if both heater hoses in engine compartment are hot when heater is turned ON. If yes and tyou do not have heat, the most likely cause would be the air mix motor, either it is faulty or stuck.

Have you checked to see if both the heater hoses going to the heater core at the firewall are getting too hot to hold?

Could be but usually when the heater core is clogged one hose will be too hot to hold while the other hose is cool to warm.

Hi thomscott,

The front air mix doors are not operating correctly causing the problem. Check if the air mix motor is working when the heater is turned on.

The air mix motor is located on the heater housing under the dash.

If you have further questions, please reply to this post using the reply to question link below so that notification would be sent to me and I can get to you as soon as I am online.

I would NOT add tranny fluid to the radiator !
Check and replace the thermostat
if its a blend door it will work in the back not in the front

Engine not getting hot thermostat is bad
replace the thermostat
catalytic converter does not effect your heater