2004 TJ Rubicon Heat Stuck on - JeepForum.com
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post #1 of 11 Old 05-24-2021, 09:36 AM Thread Starter
lazermule
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2004 TJ Rubicon Heat Stuck on

Did some searches and couldn't find any related problems to my type of HVAC control. Saw a couple of other threads where folks has issues with jammed levers and such, but my 2004 doesn't have levers for control, it has knobs.

What is happing, is that although the temp control knob turns, it just blows hot (heated) air. The A/C is working fine, just not getting the cool air into the cab. Is there a common occurance to look for here? Interestingly enough, the blower motor only worked on high a while back (pointing toward a bad resister module), but has since started working on all settings.

As far as I know, I don't have any vacuum leaks, but I will investigate that a bit closer. The engine seems to be running/idling smoothly as it wouldn't had there been a vacuum leak.

Thanks in advance for a probable place to start, or if anyone has had similar issues.

LM


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post #2 of 11 Old 05-24-2021, 12:11 PM
mukluk
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The air temperature is controlled via the blend door, which is positioned by an electric stepper motor called the blend door actuator on TJs with rotary knob controls. With the ignition switched on, observe the blend door actuator located as shown below in the passenger footwell -- does the actuator move/respond when you rotate the temperature control knob back and forth? You should see the slotted shaft passing through the middle of the actuator move as the knob is rotated. If it does move, then the blend door is likely broken; if it doesn't move, further troubleshooting of the actuator and wiring is needed.
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2000 TJ SE
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post #3 of 11 Old 05-24-2021, 12:30 PM
Rubi4MyMrs
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The blend door which controls the temp setting in electric since 1999. As you turn the knob the blend door motor is supposed to move the door. It is probably stuck. The motor is under the dash more or less in the center.

Here is a link with good info & photos.

https://www.jeepforum.com/forum/f9/h...repair-464741/





Edit: mukluk, you are too quick.
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post #4 of 11 Old 05-24-2021, 01:23 PM Thread Starter
lazermule
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Thanks for the replies guys, I ordered a new actuator for good measure. I had a Rock Auto order anyway and it was coming from the same warehouse and was less than $15.

LM


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post #5 of 11 Old 05-24-2021, 03:17 PM
2jhanna
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Not sure if it applies here, but pull the knob off and look at the "D" shaped hub on the backside. Sometimes the hub splits and doesn't rotate the shaft.

I am multi-talented, I can talk and piss you off at the same time.

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post #6 of 11 Old 05-24-2021, 05:28 PM
TheBoogieman
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Quote:
Originally Posted by 2jhanna View Post
Not sure if it applies here, but pull the knob off and look at the "D" shaped hub on the backside. Sometimes the hub splits and doesn't rotate the shaft.
I just fixed that issue on mine. It's my 5th Jeep that had it crack.
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AC Heat knob.jpg   AC knob.jpg  

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Originally Posted by jeepinmichguy_ View Post
TheBoogieman is a jerk.
2003' Rubicon/Zone 4.25" combo lift with Rancho RS5000X shocks/ Zone hydro shocks/5.13 gears/35" Mickey Thompson MTZ P3 tires/Black Magic brakes. Jeep #17 & 19.
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post #7 of 11 Old 05-25-2021, 06:43 AM Thread Starter
lazermule
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Quote:
Originally Posted by TheBoogieman View Post
I just fixed that issue on mine. It's my 5th Jeep that had it crack.
I will certainly look at this, thanks for the tip. The knob does currently rotate (seems to rotate very freely) and stop at approximately the 8 o'clock and 5 o'clock positions but I guess that could still be an issue.

LM
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post #8 of 11 Old 05-25-2021, 02:57 PM
mukluk
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It takes all of about five minutes to visually check the operation of the actuator and control panel knob, not sure why folks like to buy parts before figuring out what's wrong.
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post #9 of 11 Old 05-26-2021, 07:34 AM Thread Starter
lazermule
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Quote:
Originally Posted by mukluk View Post
It takes all of about five minutes to visually check the operation of the actuator and control panel knob, not sure why folks like to buy parts before figuring out what's wrong.
I guess I just like to spend like a Rockefeller..

LM


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post #10 of 11 Old 05-27-2021, 05:00 AM
PDoyle
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Rockefeller... Showing your age there. It's gotta be Bezos now.

2003 X, 5 speed, FT/RR bumpers by Eddie Reighard. JKS 1" body lift, JKS disco's, 2 1/2" Rough Country lift, 8k Warn, w/class 3 receiver FT & RR hitch. GA 8 rims riding 33's- GY Kevlar.
SOLD- 1985 CJ7 soft top , fiberglass body, 5" total lift258-6- Howell TBI, Full Roll cage.
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post #11 of 11 Old 05-27-2021, 06:03 AM
PDoyle
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lol.

2003 X, 5 speed, FT/RR bumpers by Eddie Reighard. JKS 1" body lift, JKS disco's, 2 1/2" Rough Country lift, 8k Warn, w/class 3 receiver FT & RR hitch. GA 8 rims riding 33's- GY Kevlar.
SOLD- 1985 CJ7 soft top , fiberglass body, 5" total lift258-6- Howell TBI, Full Roll cage.
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