Vent blowing warm air always( when AC and heater is off ) - Hyundai Forums : Hyundai Forum
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post #1 of 20 (permalink) Old 07-06-2016, 11:12 AM Thread Starter
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Unhappy Vent blowing warm air always( when AC and heater is off )

Hello everyone my name is Bob Singh,Canada. i bought a white 2015 Sonata GLS with 55000 kms on it.
Car works fine but really great on gas in city with AC ( 11-12 liters/100 kms ) .

and my main problem is my AC/heater vents. its nice cool day out and i wanna roll my windows up and use outdoor air ( with AC off and heating knob on cool - Blue side ) but still blow warmer air( the more i turn the temp knob to less cool side more warm air comes out . . i went t dealership and complaint about it but they said Cant duplicate problem. and i replaced cabin air filter too, but still same problem.

PS i don't have automatic temperature climate control option, so its all manual, red and blue setting for heat and cold.

i complaint them may be my heater stuck on heating but no action taken from them,

any suggestion will be highly appreciated.
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post #2 of 20 (permalink) Old 07-06-2016, 11:41 AM
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Quote:
Originally Posted by bobsingh View Post
Hello everyone my name is Bob Singh,Canada. i bought a white 2015 Sonata GLS with 55000 kms on it.
Car works fine but really great on gas in city with AC ( 11-12 liters/100 kms ) .

and my main problem is my AC/heater vents. its nice cool day out and i wanna roll my windows up and use outdoor air ( with AC off and heating knob on cool - Blue side ) but still blow warmer air( the more i turn the temp knob to less cool side more warm air comes out . . i went t dealership and complaint about it but they said Cant duplicate problem. and i replaced cabin air filter too, but still same problem.

PS i don't have automatic temperature climate control option, so its all manual, red and blue setting for heat and cold.

i complaint them may be my heater stuck on heating but no action taken from them,

any suggestion will be highly appreciated.
Hmm how warm are we talking about here? Here's a few things to keep in mind:

1. Your vents will never blow in completely cool air from the outside, as the outside air is taken in it is mixed with the warm recirculated cabin air before it gets vented, even when set to "Intake" mode. Not sure what the ratio is, but if I had to guess it's probably 65% Recirculated and 35% Exterior. Therefore, depending on the existing cabin temperature, your vent temperature may vary.

2. You don't have a heater in your car. Your car uses engine heat as cabin heat, the more you turn the knob to "warm," the more air is being routed around the engine to warm up before entering the cabin.

3. Even if outside air is cool, your car's vent system ducts may be hot if it was left under the sun for a while before you turned your vents on.

A few things to try:

1. Cool off the interior first before while you use the fan without AC. Open your windows and vent the majority of the hot cabin air out while setting your cabin air system to full fan speed, 100% cool, AC off, and intake mode. This will ensure the duct system is cooled off as well as the interior air it recirculates.

2. Before you set the fan to "off," ensure your knob is turned all the way to "cool," as the temperature setting is independent of the fan.

3. Based on how the system works, you'll never ever get 1:1 outside temperature match. However, if you do everything correctly, you could probably get outside air+5 degrees to vent into the cabin.

Let us know if any of above works. Good luck!
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post #3 of 20 (permalink) Old 07-06-2016, 12:33 PM
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I had this issue in my Eclipse, the best way to avoid hot/warm air from coming out the vents when you have the system off is to change your air setting to recirculate. If you have the vent open for fresh air it will constantly push air though the system while it's off. Though if you have it on recirculate it won't move any air though the warm system.

I haven't experienced this issue on my Sonata because I always have my AC on.
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post #4 of 20 (permalink) Old 07-06-2016, 10:00 PM
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Vent blowing warm air always( when AC and heater is off )

This seems to be the case for me but only on a hot day like if I'm driving mid afternoon in the sun with ac off.

I don't think much of it as the problem is resolved with a/c on for a few seconds. At first I thought car was overheating but the temp is fine.


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post #5 of 20 (permalink) Old 07-06-2016, 10:14 PM
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Sounds like a blend door issue, and the dealer should be able to suss it out. How warm is it? I thought it was always cold in Canada.

Used to be in the old days there was a valve near the firewall that would route part of the coolant through the heater core, in the xummer it would close it off and bypass it so no hot water was getting in the cabin. Now there is no valve, and warm water is alway in the heater core, but they use a diverter called a blend door to send air through the core or bypass it. It sucks dolphins, IMHO. Some blend doors are controlled by a cable, some by an actuator, which is controlled by a knob on the dash (think of your radio's Volume control). Anything controlled electronically can go tips up and cause problems.

I hate the darn things. On older cars I remove the actuator and put what looks like a choke cable on it. You perhaps do not want to do this with your car?
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Last edited by Old's Cool; 07-06-2016 at 10:15 PM. Reason: Xummer? What about Xpring and faul?
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post #6 of 20 (permalink) Old 07-15-2016, 03:18 PM
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that is normal, mine does it too, as soon as you turn on ac it starts blowing cold, you can turn on rec mode, and nothing will be blowing out the vents. air will also cool off when you turn the fan on and set temp to cold without using ac.
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post #7 of 20 (permalink) Old 07-18-2016, 11:20 AM
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Quote:
Originally Posted by introspectron View Post
Hmm how warm are we talking about here?

2. You don't have a heater in your car. Your car uses engine heat as cabin heat, the more you turn the knob to "warm," the more air is being routed around the engine to warm up before entering the cabin.

!
I am pretty sure all cars that don't have an Air cooled engine have a "Heater". The heater uses the Engine Cooling System fluid. A heater gets the engine coolant routed through it when heat is called for. The Interior fan blows over that Heater Core to deliver heat to the cabin. The air is not routed around the Engine.
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post #8 of 20 (permalink) Old 07-26-2016, 01:25 PM Thread Starter
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Originally Posted by introspectron View Post
Hmm how warm are we talking about here? Here's a few things to keep in mind:

1. Your vents will never blow in completely cool air from the outside, as the outside air is taken in it is mixed with the warm recirculated cabin air before it gets vented, even when set to "Intake" mode. Not sure what the ratio is, but if I had to guess it's probably 65% Recirculated and 35% Exterior. Therefore, depending on the existing cabin temperature, your vent temperature may vary.

2. You don't have a heater in your car. Your car uses engine heat as cabin heat, the more you turn the knob to "warm," the more air is being routed around the engine to warm up before entering the cabin.

3. Even if outside air is cool, your car's vent system ducts may be hot if it was left under the sun for a while before you turned your vents on.

A few things to try:

1. Cool off the interior first before while you use the fan without AC. Open your windows and vent the majority of the hot cabin air out while setting your cabin air system to full fan speed, 100% cool, AC off, and intake mode. This will ensure the duct system is cooled off as well as the interior air it recirculates.

2. Before you set the fan to "off," ensure your knob is turned all the way to "cool," as the temperature setting is independent of the fan.

3. Based on how the system works, you'll never ever get 1:1 outside temperature match. However, if you do everything correctly, you could probably get outside air+5 degrees to vent into the cabin.

Let us know if any of above works. Good luck!

Thank you and i appreciate your suggestion:
i tried to do cool off my cabin by rolling windows down, and even A/C too ,
but as soon as A/c loose its coolness and outside air start coming warmer. i have been reading some posts about Air blender door/Valve .
Do you think that could be the reason ?

1. if my temp knob not all the way down to cool(blue) side it blows more warmer and when its close to all the way to cool side, it blow little cooler air but still not as cool as outside air or the air i want (A/C is off).
2. when i turn on my A/c does that air comes with same Heater core way? or heater door close as soon as you turn the air condition on.

sorry to bother you .
Thanks
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post #9 of 20 (permalink) Old 07-26-2016, 01:28 PM Thread Starter
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Quote:
Originally Posted by C4RN1 View Post
I had this issue in my Eclipse, the best way to avoid hot/warm air from coming out the vents when you have the system off is to change your air setting to recirculate. If you have the vent open for fresh air it will constantly push air though the system while it's off. Though if you have it on recirculate it won't move any air though the warm system.

I haven't experienced this issue on my Sonata because I always have my AC on.
Thanks for suggestion,
i want to let the fresh outdoor air in , since air outside is cool and cabin is warmer by sun.

But i will give it a try.

Thanks
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post #10 of 20 (permalink) Old 07-26-2016, 01:29 PM Thread Starter
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Originally Posted by MattTRIX View Post
This seems to be the case for me but only on a hot day like if I'm driving mid afternoon in the sun with ac off.

I don't think much of it as the problem is resolved with a/c on for a few seconds. At first I thought car was overheating but the temp is fine.


Sent from my iPhone using Tapatalk

Thanks,
how can i check if my car is not getting over heated, if its not showing on dash display?

Thanks
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