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Discussion Starter #1
Hey all! Been awhile but have an issue. Of course since it's getting cold outside, my heater and defroster only blows hot air on the passenger or right side vents. The left side seems to blow cold air or vent temp. air.
Any help with this problem would be great! Wife drives it and we're supposed to have a chance for freezing rain and possible snow Thursday night! So I need to figure this out QUICK!
 

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Passenger side always gets more heat in mine
 

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Khaki Nitro Nut
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Sounds like something is plugged up in there.
If it were a blend door issue, you would get the same on right and left.
All the mode door does is direct the airflow. Up to the defrost, to the dash, or the floor.
You may have a mouse nest...
 

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The Univalent Radical
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Do you have a vacuum cleaner where you can hook the hose up to the blow side? If so, put the crevice tool on the end of the hose and put the tool in the heat outlet by the gas pedal - see what come flying out of the defroster vents! :SHOCKED:

:cool:
 

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Khaki Nitro Nut
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I have been thinking about this. Something does not make sense.
If you have airflow out of the ducts, as in the drivers side foot well, defrost, and dash, then it is not clogged.
If it is not clogged, then you should have heat as well as airflow.

Looking at the diagram in the SM for the air distribution part of the HVAC system. It is all one piece. There are not separate doors for the drivers side and passenger side.
For instance the air distribution center only has 1 opening which leads to the Defrost ducts. The ducts then split right and left, like a "Y".
Here is a general layout.
......¯¯¯¯¯¯Y¯¯¯¯¯¯ .....Defrost
......¯¯¯¯¯\|/¯¯¯¯¯.....Dash
......|¯¯¯¯¯¯¯¯¯¯¯|…. Air distribution
.../.|¯¯¯¯¯¯¯¯¯¯¯|.\ ....Heater core
..|..............,........|
./.........................\ ……….Heater ducts
So you can see, if there is air flow out both sides, you should have heat on both sides.
 

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I have the same problem, it's been like this since I bought it 4 years ago. The only difference is, I only get cold air on the drivers side floor, the vents and defrost both blow hot and the passenger side floor blows hot.
 

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Discussion Starter #11
It is odd. But even with the front center vents right next to each other blowing, the drivers side is cold and the passenger side is hot. Same for the defrost. I didn't have time last night to look at it. But if what your seeing in the service manual shows theres no way for that to happen, How can it happen?

Thanks for spending your time on my situation!

If anyone has any other ideas feel free.
 

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Khaki Nitro Nut
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It is a real strange one. :thk:
The only 2 ducts which are separate are the floor ducts. They come out of the air distribution housing on opposite sides of the housing.
Unless the graphics are wrong in the SM, this should not happen.
 

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Khaki Nitro Nut
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At this point I need to warn you...
Before doing any work on the Nitro, disconnect the Neg (-) battery cable and wait 10 minutes! This will allow time for the airbag capacitors to discharge.
You don't want to have your airbags go off accidentally.
It has already happened to a few members here...
 

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The Univalent Radical
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Now, this really strange. I have had my radio face plate, which includes the vent outlets, off so many times that I have lost count! Both vents come from the same large supply line! :SHOCKED:

:cool:
 

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I'm having exactly the same problem in my '07. I have great air flow at the floor vents, dash vents and the defroster. But, luke warm heat from the passenger side and no heat on the driver's side.

I checked after the drive home tonight, and both the inlet and outlet lines to the heater core are warm/hot to the touch.

Does anyone know anything about the flow through the heater core? Could it be that it has two sides and one is blocked? Or, is there an actuator that controls a door to allow airflow in over the core?
 

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Khaki Nitro Nut
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The heater core is one piece. In one side, out the other. The core sits in the bottom of the air distribution housing.
I suppose the core could be clogged up on one side, but the airflow through the core enters the bottom of the air distribution housing then up.
I do not see any kind of divider, where the doors are located, which would indicate there is 2 separate sides.
 

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The Univalent Radical
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7,287 Posts
I'm having exactly the same problem in my '07. I have great air flow at the floor vents, dash vents and the defroster. But, luke warm heat from the passenger side and no heat on the driver's side.

I checked after the drive home tonight, and both the inlet and outlet lines to the heater core are warm/hot to the touch.

Does anyone know anything about the flow through the heater core? Could it be that it has two sides and one is blocked? Or, is there an actuator that controls a door to allow airflow in over the core?
Welcome to the forum. This is all too weird.

:cool:
 

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Well, I have ruled out both the blend door and mode doors as well as their actuators. I removed both actuators and checked the function of the doors manually, and checked the function of the actuators visually. (Big Hint: These can be a pain to put back once you put power to them and they start seeking a position).

I'm really starting to think that Scar0 has this one sorted out with his call on the mouse nest ... :mad:
 

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Khaki Nitro Nut
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Well, I have ruled out both the blend door and mode doors as well as their actuators. I removed both actuators and checked the function of the doors manually, and checked the function of the actuators visually. (Big Hint: These can be a pain to put back once you put power to them and they start seeking a position).
Oh ya, and if you don't get them back in the right spot, you have to have them calibrated by a dealer...

I suppose one could try disconnecting the heater core hoses and back-flush it. Just to see what happens.
 
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