Question about 2004 Honda Civic

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04 civic heater blows cold air at idle

Cold air at idle, blows warm on the highway. Upper rad hose is hot, lower rad hose is cold. I checked the Thermostat (replaced it actually), flushed the rad. Water Pump seems ok because when I take out the thermostat and run the engine, coolant flows through the system and temp stays too cool. thought I might have an air bubble, but after purging the system I still hae the same problem.
Any thoughts would be helpful.

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  • 5 more comments 
  • zwiss99 Feb 05, 2009

    I am experiencing the same issues, but my temp gauge goes up when low RPM or stop and go traffic. I can also smell burning oil when the gauge show high temp. When I am on the highway, no problems.

  • Anonymous Mar 12, 2014

    The top hose is hot bottem hose cold

  • Anonymous Mar 13, 2014

    FORGOT TO RECONNECT THE HOSES TO THE HEAD AFTER CHANGING GASKETS. RECONNECTED AFTER DRIVING ABOUT 2 MILES ON THE HIGHWAY. HEATER BLOWING COLD AIR. WHY? HOW CAN I CORRECT THIS?

  • Anonymous Mar 28, 2014

    Have a Nissan Titan 2009 running warm even in idle top hose hot lower hose cold

  • Anonymous Mar 28, 2014

    Have a Nissan Titan 2009 running warm even in idle top hose hot lower hose cold

  • Anonymous Mar 28, 2014

    Have a Nissan Titan 2009 running warm even in idle top hose hot lower hose cold

  • Anonymous Mar 28, 2014

    Have a Nissan Titan 2009 running warm even in idle top hose hot lower hose cold roaring sound when speeding up

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You should have hot water on all rad. hoses when the motor is running at a norm. temp. the water is not going through the heater core like it should. you have cutoff valve bad low water are a stopped heater.try a hoter thermostat if none of the above are true.

Posted on Jan 18, 2009

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