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Old 07-20-2011, 03:16 PM
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A/C and Heater Controls Not Working?

The controller knob that switches from legs, defrost, front etc.. isn't working. It only works on one setting, heat, and A/C both work fine, just the control knob doesn't switch back and fourth. Any ideas?
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Old 07-20-2011, 05:19 PM
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Re: A/C and Heater Controls Not Working?

It's vacuum controlled so I would guess it's a vacuum leak. Have you pulled the control panel out and looked at the condition of the hoses? Maybe one of them is pinched.
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Old 07-20-2011, 05:27 PM
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Re: A/C and Heater Controls Not Working?

2004 4.7L SRT8 WK2
Isn't there somwething wrong in your sig? If you have a WJ, i can give you some ideas, if its a WK not.
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Old 07-21-2011, 09:11 AM
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Re: A/C and Heater Controls Not Working?

lol I really don't know what kind of Jeep I have other than 2004 Cherokee, so i just picked those randomly
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Old 07-21-2011, 10:07 AM
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Re: A/C and Heater Controls Not Working?

Quote:
Originally Posted by bommar37 View Post
lol I really don't know what kind of Jeep I have other than 2004 Cherokee, so i just picked those randomly
There's a difference between a Cherokee and Grand Cherokee. But since they stoped making the Cherokee in 2001, I'm going to assume you mean Grand Cherokee.
ZJ = 1993-1998 Grand Cherokee
WJ = 1999-2004 Grand Cherokee
WK = 2005-2010 Grand Cherokee
WK2 = 2011+ Grand Cherokee

Do you know if you have a 6 cylinder or 8 cyliner?
6 cylinder = 4.0L
8 cylinder = 4.7L

I do not believe they made a SRT8 for the WJ. That would mean that you have a 2004 WJ.
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Old 07-23-2011, 06:18 AM
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Re: A/C and Heater Controls Not Working?

So now it depends if you have a WJ with the manual temp control, or the AZC (automatic zone control system). The manual control is vacuum controlled, the AZC with an electric motor. With the vacuum control many times the problem is a disconnected or leaking vacuum line in the engine bay.
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Old 07-24-2011, 10:41 AM
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Re: A/C and Heater Controls Not Working?

How do I determine which one I have??? I don't think it's the blower resister because my high medium low blower settings work fine, its the direction of the flow that isn't working. Air only comes out of the defroster up against the windshield no matter the flow control position. So if I have it set to legs it still only will come out the defroster.
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Old 07-24-2011, 11:11 AM
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Re: A/C and Heater Controls Not Working?

Quote:
Originally Posted by bommar37 View Post
How do I determine which one I have??? I don't think it's the blower resister because my high medium low blower settings work fine, its the direction of the flow that isn't working. Air only comes out of the defroster up against the windshield no matter the flow control position. So if I have it set to legs it still only will come out the defroster.
Does it look like this?


If it looks like that, it's the manual control and you most likely have a vacuum leak somewhere. If it doesn't look like that, then you have an automatic system that's controlled electronically.
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Old 07-24-2011, 03:17 PM
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Re: A/C and Heater Controls Not Working?

When you have only low/medium/high for the blower settings, for sure you have the manual system. The default position is windshield when you loose the vacuum. Have a look under the hood if you can find the hose (it comes out of the firewall on drivers side (when you're not in England at least) and goes to the throttle body when i'm not wrong. You probably have a leaking or disconnected line.
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