Question about 2004 Honda Odyssey

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2004 Odyssey, heat and A/C do not work unless van in motion

The fans blow fine, but unless the van is actually driving down the street, the heat or A/C do not come out, just outside muggy air comes through vents, or cold air if winter. At stoplights, the controlled air stops until the van starts moving again.
During cold days, I would run the van to warm it up for my wife. After 20 minutes, the van temp was 210 on the engine, but the cabin temp was still freezing and cold air blowing through vent, until you start driving, then warm air starts coming through.

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  • divesouza May 13, 2009

    Thank You, I will try this tomorrow.

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Since warm air eventually comes out when the vehicle is in motion, you may have an air mix door that is stuck in fresh or is somehow blocking warm air from the heater core.

To see if the air mix control motor is bad, you need to retrieve your Diagnostic trouble codes (DTC's) from the heater control panel. To run the diagnostic function, do the following:
1. Turn the ignition switch ON (II).
2. Turn the fan switch OFF.
3. Press the recirc control button to select Recirc (recirc light on.)
4. Press and hold the recirc button to select Fresh (recirc light off) and continue to hold the button down until the recirc light comes on for two seconds and then goes off.
5. If the system is okay, the recirc light stays off.
6. If there is a problem, the recirc light blinks the DTC to indicate the trouble. One blink=a problem in the air mix control motor circuit. Two blinks=problem in the mode control motor circuit
Three blinks=problem in evaporator temp sensor circuit.
7. Turn the ignition switch off to cancel the self diagnosis function. Run the diagnostic again after repairs are complete.

Note: the air mix control motor has a rod which connects to a plastic link. The link controls the mix doors and also connects to the heater control water valve via a cable. The air mix motor may check okay, but if the link is broken then you will still have problems. the motor is on the bottom of the heater unit in the front passenger's foot well.

Posted on May 11, 2009

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