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Hyundai heater problem

I have a 2008 hyundai accent with a heating problem. I have had the car in twice about it, the first time was part of a service interval and they flushed out the cooling system. It didn't work, they then told me it was likely the thermostat, so after three weeks a new one came in and I had it replaced, still the same. If the engine rpm is high, I get "warm" air, not hot, never hot air actually, but as soon as I shift gears or idle, it blows cool air. It is definitely connected to the engine speed , is this a heater core problem?

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  • 2 Answers

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: 04 civic heater blows cold air at idle

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

  • 3 Answers

SOURCE: 2001 FORD EXPEDITION XLT 4.6L V8 BLOWING MILD WARM

You hot air comes from the water circulated through the heater core. It is like a miniture radiator with water flowing thru it constantly. So by opening the "Blend Door" you are permitting so much of this hot air to pass thru.

Seems like for some reason your heater core is plugged up. Just like a radiator can be. So water may be passing through your heater core but not passing through fully. Your heater core gets hot from water passing throught it from the engine. Then your doors open up, in proportion to how much air is permitted to pass over the heater core.

Suggest to remove the heater core and replace it. Seems the blend doors are working properly but again, if you have a non working heater core then no air can pass over the "Hot Core" for you to recieve hot air.

If you are not mechanically inclined, then go to a local parts store and you can buy a car manual, such as Chilton's or Hane's Car manuals, for your year and make to show you how to replace it. Then you can also have it for any other problems that may arise.

Posted on Jan 24, 2010

  • 714 Answers

SOURCE: Heater doesn't put out heat.

could be your temp control actuator which is under the dash

Posted on Jan 31, 2010

  • 635 Answers

SOURCE: replaced thermostat and flushed out heater core 3

If the heater core is not damaged or leaking ie: if you don't see coolant on the INSIDE of your windshield or coolant on the floor inside the car then chances are you may just need to BLEED the radiator.

remove radiator cap

Fill coolant resovoir to the cold line if the engine is cold from sitting overnight.

Start engine with cap off

Wait till engine gets hot

While waiting you will see a big gurgle of air bubbles come out and the coolant level will drop

Fill the radiator with more coolant to compensate.

When the fans come on and it stops gurgling air install the radiator cap

You are done

Watch the coolant level for the next few days and top off in the resovoir as needed to keep it filled.

Your heat should be very hot now providing you installed the correct oem thermostat correctly.

Hope this helps

Posted on Mar 31, 2010

  • 147 Answers

SOURCE: 2008 Chevy Uplander has 21,000 miles. Nno heat

Uplanders with the 3.9 engine are prone to no heat at idle speeds. Probably weeping head gasket. Air bubble trapped. Dealers will remove rad cap and let it sit at about 25 deg. angle for a couple hours. Good for awhile.

Posted on Nov 23, 2010

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