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Heater not working it blows cold air?

Tiny
NEIL2002CIVIC
  • MEMBER
  • 2010 HONDA ACCORD
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 34,000 MILES
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
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Monday, January 15th, 2018 AT 10:30 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Tuesday, January 16th, 2018 AT 3:24 AM
Tiny
NEIL2002CIVIC
  • MEMBER
  • 117 POSTS
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
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Tuesday, January 16th, 2018 AT 4:18 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It is complicated but not that bad. Try the flushing first and let me know.

Roy
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Tuesday, January 16th, 2018 AT 5:40 AM
Tiny
NEIL2002CIVIC
  • MEMBER
  • 117 POSTS
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
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Saturday, March 17th, 2018 AT 5:18 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Saturday, March 17th, 2018 AT 5:36 AM

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