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Old 04-28-2010, 07:32 AM
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Need Opinions, Possibly Blend Door?

For 2003 Grand Cherokee Laredo 4.0L I6

I noticed today that when I turn my heat on it doesn't work as it should. What I mean is that when I turn it on full heat, the air is only warm. It feels as if you turn the vent on during a summer day (semi warm but not hot). The weird thing is that if I turn the blower to HI, it SOMETIMES starts blowing HOT air (like it should). Then when I turn it to a lower setting it will go back to warm air. But, other times I can turn the blower to HI and it stays the same warm temperature.

So, does anyone have any ideas? I'm leaning towards the blend doors as it's a common problem. But I've also read about the air re-circulate door being a problem as well. Either way, I'm not real enthusiastic about spending a weekend tearing my dash apart. Any ideas are welcome.
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Old 04-28-2010, 07:59 AM
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Re: Need Opinions, Possibly Blend Door?

looks like ur gonna have to get in there and tear it apart

good luck though
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Old 04-28-2010, 11:09 AM
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Re: Need Opinions, Possibly Blend Door?

Could be the "door actuator" I can't remember the offical name. It's just behing the glove box and on the left side. I had the same problem and that's what fixed it.

It's the piece that moves to open the blend doors.

Here's some info from WJJeeps.com

Temperature coming from the HVAC system blows cold air only.
Air temperature remains cold regardless of the position of the temperature knob. Observe the temp door actuators on the HVAC housing while rotating the temp knob. If the actuators rotate, but the air temp does not change, the problem could be a broken temp door or temp door stop. Blend doors and doorstops are available through the Mopar Parts. The part number of the doorstop is 05012711AA.
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Old 04-28-2010, 01:17 PM
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Re: Need Opinions, Possibly Blend Door?

The thing under the glove box is the blower motor. There is also a resistor on it that can go bad (melt). Start with that first, cause it's a real easy fix. Is the air coming out with any power or is it barely blowing?
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Old 04-28-2010, 04:57 PM
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Re: Need Opinions, Possibly Blend Door?

I've attached a small picture of the piece taht fixed my problem that I just cut out of the FSM. I am pretty sure this is your prolem. I just got mine for $10 from a pull-a-part place.

They are I think $80ish new at the stealership.
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Old 04-29-2010, 08:59 AM
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Re: Need Opinions, Possibly Blend Door?

Quote:
Originally Posted by StoneCold View Post
The thing under the glove box is the blower motor. There is also a resistor on it that can go bad (melt). Start with that first, cause it's a real easy fix. Is the air coming out with any power or is it barely blowing?
Yeah, air is coming out at all speeds. On any speed except HI the air that's coming out is warm. Once I turn it to HI the air will get hot like it should be. I've replaced the blower motor resistor in my wife's Cavalier when it only worked on HI.
Quote:
Originally Posted by 206WJ View Post
I've attached a small picture of the piece taht fixed my problem that I just cut out of the FSM. I am pretty sure this is your prolem. I just got mine for $10 from a pull-a-part place.

They are I think $80ish new at the stealership.
Thanks, I'll look into this first. I would much rather pull out the glove box than remove the dash and everything to fix the blend door.
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Old 04-30-2010, 03:16 PM
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Re: Need Opinions, Possibly Blend Door?

Do you have the digital or analogue airco system?
When you have the digital one, try the below procedure to look for fault codes:

To enter the AZC self-diagnostic mode, perform the
following:
(1) Depress the a/c and recirc buttons at the same
time and hold. Rotate the left temperature control
knob clockwise (CW) one detent.
(2) If you continue to keep the a/c and recirc buttons
depressed, the AZC control module will perform
a Segment Test of the Vacuum Fluorescent (VF) display.
In the Segment Test you should see all of the
display segments illuminate as long as both buttons
are held. If a display segment fails to illuminate, the
vacuum fluorescent display is faulty and the a/c
heater control must be replaced.
(3) After viewing the Segment Test, release the
A/C and Recirc buttons and the display will clear
momentarily.
If a 0 is displayed, then no faults
are set in the system.
Should there be any faults,
either
"current" or "historical", all fault codes will be
displayed in ascending numerical sequence (note no
effort is made to display fault codes in chronological
order). Each fault code is displayed for one second
before the next code is displayed. Once all fault codes
have been displayed, the system will then repeat the
fault code numbers. This will continue until the left
side set temperature control is moved at least one
detent position in the CW direction or the ignition is

turned "
OFF".

If you find any code, let me know and i can find the corresponding fault.

The analog system im not familiar with, only know that it uses blend doors which use vacuum from the engine for operation.
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Old 04-30-2010, 09:20 PM
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Re: Need Opinions, Possibly Blend Door?

I must have the analog system. I do not have an air recirc button. It's a selectable setting on the main dial (ie, defrost, foot vents, foot and main vents, main vents, air recirc).
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Old 05-01-2010, 10:39 AM
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Re: Need Opinions, Possibly Blend Door?

On the site of www.wjjeeps.com they say that the manual system (what i had called the analogue) has one blend motor, which is accessable behind the glove box. Maybe that someone with this manual system can give more info. by simply removing the glove box.
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Old 05-01-2010, 10:48 AM
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Re: Need Opinions, Possibly Blend Door?

Quote:
Originally Posted by Frango100 View Post
On the site of www.wjjeeps.com they say that the manual system (what i had called the analogue) has one blend motor, which is accessable behind the glove box. Maybe that someone with this manual system can give more info. by simply removing the glove box.

That's the exact piece I have been talking about the whole time. Also known as the "blend door actuator" But nubody likes to listen to me...
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Old 05-01-2010, 04:47 PM
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Re: Need Opinions, Possibly Blend Door?

I had to have a heater core about a year ago... similar symptoms...
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Old 05-01-2010, 06:25 PM
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Re: Need Opinions, Possibly Blend Door?

Quote:
Originally Posted by 206WJ View Post
That's the exact piece I have been talking about the whole time. Also known as the "blend door actuator" But nubody likes to listen to me...
No man, I'm not ignoring your suggestion. I did say that's what I'll be checking first to avoid tearing out the whole dash. Didn't get to it today b/c I was working on the house.
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