2005 Grand Cherokee heat only works on max temp - JeepForum.com

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post #1 of 34 Old 09-15-2013, 06:47 PM Thread Starter
chris9581
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2005 Grand Cherokee heat only works on max temp

I am having a problem with my 2005 Grand Cherokee (Limited 5.7 Hemi) cabin heater. After the engine is warmed up, the heat will only work at the maximum temperature setting (set on the RED dot of the climate control). As soon as I move the dial up one notch it gets cold. This happens on both the manual air temp setting and the auto setting. The blower works perfectly. Any ideas what is causing this? I'm at a loss and frustrated... Thanks in advance for the help!

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post #2 of 34 Old 09-15-2013, 09:53 PM
CT05WK
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I was just going to post this. I have the same issue with my 05 Limited 4.7L
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post #3 of 34 Old 09-16-2013, 08:25 PM
loganheadx
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I am too.... 05' 5.7 hemi
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post #4 of 34 Old 09-16-2013, 08:47 PM
JRLT
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Worth a look.
http://www.youtube.com/watch?feature...&v=dcL_0TWeZJY

2010 3.7L, 4XGuard Matrix, Fastman TB, TB Ground Mod, Injen CAI, 255/60/18 Nitto Terra Grapplers, Bilstein Shocks & Struts, Cruiser Alloy Wheels - Switchblade, Stillen Brakes, Cargo Light Strip Mod, Electric Ashtray Mod, Jet-powered, Monkey Navigated...
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post #5 of 34 Old 09-17-2013, 08:51 AM Thread Starter
chris9581
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Thanks for the video. I had the heater core replaced last winter because it was leaking and the coolant system was flushed at that time. I would think if the heater core was clogged, it wouldn't produce heat, right? Any other ideas what can be causing heat only on max temp setting?
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post #6 of 34 Old 09-17-2013, 04:18 PM
loganheadx
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bump
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post #7 of 34 Old 09-17-2013, 05:16 PM
RUGLAYR
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It sounds like the control panel has went bad. A clog or air in the heater core would cause no heat at all so that would leave the temperature part of the control panel being faulty
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post #8 of 34 Old 09-18-2013, 05:40 PM Thread Starter
chris9581
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Thanks for your input! Do you know of a way to test the temp control to make sure that is the problem? I'm on the fence about buying a new control panel without knowing for sure. Also, FYI, I have a dual-control panel and both controls do the same exact thing... Blow cool/cold until I move the dials to max heat. Once I do that, the air out of the vents is HOT. Is it possible both controls can be bad and behave the same way?
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post #9 of 34 Old 09-18-2013, 08:08 PM
RUGLAYR
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Have you had your heater controls out recently? There are a few plugs in the back one could have possibly came loose. Not saying it's the issue but worth a try
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post #10 of 34 Old 09-18-2013, 08:30 PM
RUGLAYR
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And even though you have the dual zone like I do it still had to read the interior temperature of the vehicle which is probably the part that went bad. When it's all the way cold it only blows cold and when all the way hot the opposite when it's in those positions it's not trying to adjust temperature to a certain degree.
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post #11 of 34 Old 09-20-2013, 08:14 AM Thread Starter
chris9581
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I have never had the controls out of the dash. I'll check the connections soon and will post the results. Thanks for the help!
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post #12 of 34 Old 10-07-2013, 03:09 PM Thread Starter
chris9581
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The connections on the temp controls are just fine. Any other ideas or thoughts on this issue would be appreciated. Thanks!
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post #13 of 34 Old 10-07-2013, 03:12 PM
RUGLAYR
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I would say it's the control unit itself if all the connections are good.
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post #14 of 34 Old 10-09-2013, 02:39 PM
Jasmin71
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We have same Problem..... I was told its my Head .....
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post #15 of 34 Old 10-10-2013, 12:42 AM
94jeepman
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lets us know if you figure it out I have the same problem but hasn't bothered me that bad only because I had a yj before it haha
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2005 , grand cherokee , heater control , jeep , maximum

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