Question about 2004 Honda Odyssey

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2004 Odyssey heater not warming up...replaced thermostat still not hot

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Could be a bad heater control valve,

Posted on Oct 11, 2010

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I have a Honda accord 2.4 exec on an 03 plate. The heated seat switch lights on bothe seats but neither get warm. Is there a relay that needs replacing? any help would be appreciated.


According to the factory wiring diagram for a 2002 Honda Odyssey, the seat heater switch hi/low indicator lights won't light up unless the seat heater relay is good. The seat heaters have thermostats and circuit breakers that limit power to the seat heaters under the following conditions:

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Heater is not blowing warm air. 2004 odyssey.


Welcome to FIxYa.com


First check the heater control valve install a piece of 10mm hose to top so cable will not come off ( see diagram)

Check coolant level, do you have heat at defrost?, if not --replace heater core and flush coolant.

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Regards, Lee Davidian


Thank you for using FixYa,com.

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