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Old 06-17-2015, 01:19 PM
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'05 4.7L Grand Cherokee HVAC Issue

Hello all- Currently having an issue with my 2005 Grand Cherokee 4.7L. When I have my thermostat on cool and have the fan on, it blows hot air. I don't mean hot air because it's hot outside, I mean hot air like it's running through the heater core. It's definitely not drawing in fresh outside air. It does the same when I have the AC on. I know the AC needs a charge, as it was rather weak last summer. However, I would like to atleast be able to get it to blow cool outside air.

I did plenty of searching, but could not find an answer to my problem..maybe I wasn't wording my search properly.

My first thought was a fuse or relay for the thermostat?

Any Ideas?

Thanks!!

-John

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  #2  
Old 06-17-2015, 07:39 PM
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Re: '05 4.7L Grand Cherokee HVAC Issue

Welcome to the garage John,
This seems to be a problem with the blend door or actuator. That door must lead all the air around the heater core (for cold selection), all air through the heater core (for hot selection) or any mix in between for the desired temperature. Do you have a single zone system, or the dual zone?
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Old 06-18-2015, 12:20 AM
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Re: '05 4.7L Grand Cherokee HVAC Issue

Thanks for the welcome. That does make sense, guess I was overthinking the issue. It is a dual zone system (the rear has it's own thermostat knob - I'm assuming that's what you mean by dual zone?). Is that a tough fix?

Edit: If you mean dual zone by the Left/Right having their own respective thermostat knobs, then no it's not dual zone, it's single.


-John
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Old 06-18-2015, 12:31 AM
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Re: '05 4.7L Grand Cherokee HVAC Issue

Normally a dual zone system has a separate temperature regulation for driver and front passenger. I donīt know the WK, so donīt know how the rear temperature control is managed.
So is there a separate temperature control knob for the driver and passenger on the AC control head? If there is, then it is dual zone with two blend doors. If there is only one temperature selector, then it is a single zone system with 1 blend door
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  #5  
Old 06-18-2015, 12:36 AM
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Re: '05 4.7L Grand Cherokee HVAC Issue

Just saw your edit. Single zone then. The actuator for the single zone blend door sits on the left side (drivers side) of the HVAC housing. See attached page how to access it. You will have to remove the actuator and see if it rotates when changing the temperature setting. Then also feel on the input shaft of the blend door if you can move it by hand, or that there is no friction at all, sign of a broken blend door hinge.
Attached Files
File Type: pdf WK blend door actuator.pdf (101.9 KB, 6 views)
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Old 12-08-2016, 02:26 PM
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Re: '05 4.7L Grand Cherokee HVAC Issue

Hi,

So my 05 GC Wk has a single zone hvac system and the blend door has broken free from the actuator. (I move the knob and the actuator moves but the door does not change position so I still get no heat.) I have seen lots of videos on youtube on how to cut a small hole to fix the dual zone blend doors, anyone know of a video on how to cut a hole to fix the blend door on a single zone system?

Thanks

God bless...
Mark
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