Heater not working it blows cold air?

2010 HONDA ACCORD
34,000 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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NEIL2002CIVIC
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I have warm heat unless I drive for a long time then it gets a little warmer, but not hot like my 2002 Civic it blows me out of the car. The car listed above has manual controls and I use the re-circulation button. I replaced the thermostat OEM with Honda 50/50 blue anti-freeze. Both heater hoses seem to be equal in temperature 156 is the warmest it gets same way as the old thermostat. The car seems to be running cooler then normal. May explain poor gas mileage. Any popular problems with this model?Please help it is getting cold here. LOL
Jan 15, 2018 at 10:30 PM
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ASEMASTER6371
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Good morning.


it sounds like the heater core is clogged. you will need to remove the hoses from the core and flush it with a garden hose and assist with air pressure is you have a compressor. if that does not work, then the heater core must be removed.

Lets go over this guide to be sure

https://www.2carpros.com/articles/car-heater-not-working

Roy
Jan 16, 2018 at 3:24 AM
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NEIL2002CIVIC
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Thanks Roy, I will try flushing the core. If it needs the core, how big of a job is it? looks like a nightmare! If I cannot do it myself where do I bring it? Dealer?

Neil








Jan 16, 2018 at 4:18 AM
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ASEMASTER6371
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it is complicated but not that bad. try the flushing first and let me know.

Roy
Jan 16, 2018 at 5:40 AM
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NEIL2002CIVIC
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Hi I flushed the core it seemed a little better. One other update if I drive the car for a while and use the heat it works okay but...when I turn it off for a few minutes then restart it the heat works great nice and hot. Can you please explain why this happens. I don't want to do a heater core if its not needed. Thanks,

Neil
Mar 17, 2018 at 5:18 AM
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ASEMASTER6371
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Ok, I would start by flushing the core again. you made progress but it sounds like it needs more flushing.

It gets hot because when you shut it off, the heat from the hoses heats up the core temporarily.

Roy
Mar 17, 2018 at 5:36 AM