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Old 11-13-2009, 08:36 PM   #1
jonathan13
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Default heat/air stuck on vents only (no feet or defrost)

as the title says my air and heat will only blow out of the vents.. when i press the buttons from defrost and feet they light up as though they have changed but still air only comes from the vents- no warm feet and no defrosted windshield.. im assuming its a motor failure that changes the flow of air.. could it be something else? where should i start trouble shooting? thanks for any help!... btw its a 98 4dr accord 4cyl model.
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Old 11-14-2009, 04:31 AM   #2
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Default Re: heat/air stuck on vents only (no feet or defrost)

When you press the buttons to change ventilation mode can you hear the humming of the mode control motor inside the heater unit? If you cannot hear the motor spin then there's a problem with the motor or the cabling. Do the test with engine not running and ventilator speed low.
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Old 11-16-2009, 01:08 PM   #3
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Default Re: heat/air stuck on vents only (no feet or defrost)

tried that and i had the fan on the lowest setting and when i change the modes from lets say vent to floorboard there is no change in noise- just the small "hum" of the fan blowing
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Old 11-16-2009, 02:09 PM   #4
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Default Re: heat/air stuck on vents only (no feet or defrost)

Must be the mode control motor is not working (like you suggested in your first post). There's a good chance you can locate it under the dashboard on the driver's side, to the right of the throttle pedal. It has a seven wire connector attached to it.
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Old 11-18-2009, 06:20 AM   #5
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Default Re: heat/air stuck on vents only (no feet or defrost)

appreciate the info, i was very worried i was going to have to dig and dig to find it somewhere deep in the dash.
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Old 11-18-2009, 06:25 AM   #6
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Default Re: heat/air stuck on vents only (no feet or defrost)

another question.. when i search ebay for this part it is separate from the blower motor correct? so what exactly is it called and what should i search for?
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Old 11-18-2009, 06:30 AM   #7
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Default Re: heat/air stuck on vents only (no feet or defrost)

nevermind, apparently it is called exactly what you said it was.. a "mode motor". thanks again
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Old 11-18-2009, 08:05 AM   #8
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Default Re: heat/air stuck on vents only (no feet or defrost)

Quote:
Originally Posted by jonathan13 View Post
appreciate the info, i was very worried i was going to have to dig and dig to find it somewhere deep in the dash.
I remember spending half a day taking out the center console, radio, instrument panel etc... only to find out that the ventilation control cable had come off because some day my foot had slipped off the throttle pedal... (car had manual ventilation controls)
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92, 99, accord, acura, air, civic, defrost, flow, foot, heat, honda, mode, stuck, tl, vent

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