Question about 2006 Nissan Xterra

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Heater blowing cold on 2005 Nissan Xterra

Even when the engine is warm, the heater continues to blow cold air. Any suggestions?

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  • chip5150 Nov 22, 2008

    My heat blows cold, even after 30 minutes with the engine running.
    I have a secondary cooling fan on the radiator, and unhooked the power running to that fan. Will see if that makes any difference.

    Sucks not having warm air during the winter... taking the vehicle 45 mins to "warm up" is ********.


  • artski34 Jan 14, 2009

    2005 nissan xterra and nothing but cold air even after 40 - 60 mins driving. took ti to shop they said there was an air bubble in my radiator but i suspect they said that becasue that wouldnt be something covered under warranty which just expired. So that may be the cause i havent fixed it yet, i am going to try adding antifreeze today , it is 0 degrees this week and i need soem heat!

  • Anonymous Feb 01, 2009

    My 2005 Nissan Xterra also blows cold air while on heat setting. It just started doing it this year, and only blows cooler air when its in idle, such as sitting in my driveway or at stop signs and lights, as soon as I driving again, it blows warmer air again. I suspect it will start blowing cold air all the time like in the other posts. The dealership says they don't have any idea why its doing that. So??

  • lesterallen May 11, 2010

    Is there an "Econ" setting button or selection on your heater control?

  • Anonymous Mar 24, 2014

    Heater blows cold air even when the vehichal is warmed up

  • Anonymous Mar 27, 2014

    My nissan xterra engine shut off wen the air compresor activate in lo rpm

  • Anonymous Mar 29, 2014

    My heater is blowing cold air it won't warm up

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I live in Alaska and have had the same problem i just added more coolent to the radiator and it warmed up i installed a block heater and i leaked a bit and the coolent level got low and i would have no heat. I tryed to fill just the coolent resivoir and that dident work so i filled the radiator pumb full and that worked!! Hope this helps.

Posted on Jan 18, 2009

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No is there isn't.

Posted on Nov 17, 2008

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1 Answer

No heat air is blowing cold


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is worm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest to flush the heater core.

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1 Answer

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It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:

First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

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1 Answer

Heater not working


First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

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2 Answers

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