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No heater

Tiny
DUSKO
  • MEMBER
  • 2007 DODGE NEON
  • 2.8L
  • 4 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 50 MILES
Air condition working well, but now is very cold, no heating in cabin, blower working but air is cold, I try to found how to open manual flap but not found. When I changed botton min to max for heating same time coaming ltl hot but steel is cold
Sunday, December 15th, 2013 AT 2:03 PM

13 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If not too hot to hold, then you have to look at the actual engine temp and if that is up, if it is, then your looking at a restricted heater core or poor circulation for another reason.
If you find that they are both too hot to hold, then the heat in that vehicle is controlled by a blend door that regulates heated air flow. it is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.

This guide will help us.

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

Please run down this guide and report back.

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Sunday, December 15th, 2013 AT 3:23 PM
Tiny
TROMOSER0929
  • MEMBER
  • 1 POST
  • 2003 DODGE NEON
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 107,000 MILES
I have had problems with my heat for a while now the check engine light came on and I took it to autozone and had the code pulled, The code was for low coolant or bad temperature sensor I check the coolant was fine so I had the coolant temp sensor change out and it is still not working right. At low speed the temp sensor works fine but as soon as you get on the freeway it stops working and the heat goes out in the car. I have also changed the thermostat and cannot think of anything it could be. Please help me if you can thanks
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Monday, April 27th, 2020 AT 2:29 PM (Merged)
Tiny
SHARPKAT79
  • MEMBER
  • 17 POSTS
You could have a blocked heater core or even just partly blocked not enough to make it over heat. But before replaceing the heater core I would go get the cooling system flushed
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Monday, April 27th, 2020 AT 2:29 PM (Merged)
Tiny
RICHARDTB15
  • MEMBER
  • 1 POST
  • 2002 DODGE NEON
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 146,000 MILES
When I turn my heater on low, it blows hot air, when I turn my heater on high it blows cold air. I already changed the termostat, and I took apart my dashboard and checked the control. I dont think its my heater core, because I have no leaks, and it does blow hot air on low. Does anyone know how to fix?

Thanks
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Monday, April 27th, 2020 AT 2:29 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Does your car use electric actuators for the blend door? I have seen a Chevy do that due to a weak actuator motor and when on High, would actually push the blend door over to cool. Worth looking at. Does the engine run at correct temp?
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Monday, April 27th, 2020 AT 2:29 PM (Merged)
Tiny
BRANDI1TAYLOR1
  • MEMBER
  • 1 POST
  • 2002 DODGE NEON
  • 4 CYL
  • 2WD
  • AUTOMATIC
Heater blows air out, but will not blow warm air out.
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Monday, April 27th, 2020 AT 2:30 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
Feel the upper radiator hose after the engine is warmed up. It should be too hot to hold onto for very long. If it is, feel the two heater hoses. If they're just warm, the heater core is plugged.

More commonly, if the radiator hose is just warm, suspect the thermostat.
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Monday, April 27th, 2020 AT 2:30 PM (Merged)
Tiny
KAI6
  • MEMBER
  • 1 POST
  • 2000 DODGE NEON
My heat in my car is not getting hot. There is anti-freeze in the radiator. The air is just not getting hot. What might be the problem?
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Monday, April 27th, 2020 AT 2:30 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Check and replace the thermostat
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Monday, April 27th, 2020 AT 2:30 PM (Merged)
Tiny
NUMMY
  • MEMBER
  • 1 POST
  • 2000 DODGE NEON
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 89,000 MILES
My son's heater works when standing but when driving it blows cold air. Is there a damper that's not closed or how can he fix this problem easily?
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Monday, April 27th, 2020 AT 2:30 PM (Merged)
Tiny
DR LOOT
  • MECHANIC
  • 2,311 POSTS
There is never an easy fix, and when you say that you just curse the job and it makes it one billion times more complicated, so don't ever say that again. I will give you a few pointers, open up the hood and check all of your vacuum lines going into the firewall ( that means inside the car) they will be very small lines, make sure they are not broken or cracked, that dampener door that you are referring to is controlled by a vacuum, let me know what you find out, , and it is not going to be easy, making sure that your vacuum lines are in good condition.
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Monday, April 27th, 2020 AT 2:30 PM (Merged)
Tiny
CASPER27292
  • MEMBER
  • 5 POSTS
  • 1999 DODGE NEON
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 211,000 MILES
My dodge neon is blowing nothing but cold air as heat, it has a new radiator, new thermosthat and has been flushed and the heater core has been flushed, one person said something about a vaccum hose and flap that allows the heat into the car, where is the flap and vaccum hose? Please resond, I am freezing in the mornings and now my car is overheating. Thank you, ps. I have tried everything. The heat starts to blow hot for a split second and then goes cold again, my heater hoses are getting hot and it seems the water is cirrculating fine, I am goin to change the thermosthat again but I need to know where and how to get to the flap people are telling me the might be closed, please help me, plz e-mail me with a response. Thanx. Casper27292@yahoo. Com
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Monday, April 27th, 2020 AT 2:30 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi:
My concern is the car is overheating with all of the work you have done. That shouldn't be the case.

As far as the vent door, it's called a blender door. It should be located in the heater core box.
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Monday, April 27th, 2020 AT 2:30 PM (Merged)

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