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post #1 of 6 Old 05-05-2019, 03:21 PM Thread Starter
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AC issue

I wasn't sure where to post this, so I apologize if this isn't the right forum.

I have an 07 and I live in AZ and I rarely use my heat during the winter. The few times I did use it, it worked fine. I started noticing it was making a slight hissing/breathy noise that would go from high to low continuously then a considerably louder one when I'd switch it off. It got a little warmer so I stopped using it all together since I prefer the windows down.

We're starting to get into our higher temps so I turned on the AC and the same noise was present, only a little louder this time. I also noticed that it's blowing warm, but not hot air on the drivers side and cooler air on the passenger side. Then warm on both sides when I switch it to high. The heat works perfectly fine and I already checked the actuators and I can seem them moving when I turn the heat/cold dial.

Does anyone have any idea on where to start looking for the problem?

Thanks.
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post #2 of 6 Old 05-05-2019, 04:53 PM
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I've heard before that the ducting behind the dash can overheat and partially deform / melt. Recommend searching on it either here or Google. I think @KOWBOY on here had a melted part replaced with stainless or some such.

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post #3 of 6 Old 05-05-2019, 09:18 PM
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Hoping someone can answer this. Was gonna create a new thread about this but saw this.
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post #4 of 6 Old 05-25-2019, 10:31 AM
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Go through normal AC trouble shooting steps. With gauges, check low and high side pressure. Plenty of YouTube videos.

Hissing that happens all the time is usually an issue where blend doors arenít opening and shutting as they should.

Hissing that happened for a time and is not longer happening could be a refrigerant leak. If you heard that in the cab, then it evaporators most likely.

Hissing could also just be your climate system doing it thing.

Regardless, start diagnosing AC with pressures to see if you have refrigerant in your system. If you do have refrigerant and itís blowing warm, the you have bad compressor or blockages. Pressure differences between low and high sides can then tell you where blockage is, or if compressor has failed.
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post #5 of 6 Old Yesterday, 05:27 PM Thread Starter
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Quote:
Originally Posted by Laggy View Post
Go through normal AC trouble shooting steps. With gauges, check low and high side pressure. Plenty of YouTube videos.

Hissing that happens all the time is usually an issue where blend doors arenít opening and shutting as they should.

Hissing that happened for a time and is not longer happening could be a refrigerant leak. If you heard that in the cab, then it evaporators most likely.

Hissing could also just be your climate system doing it thing.

Regardless, start diagnosing AC with pressures to see if you have refrigerant in your system. If you do have refrigerant and itís blowing warm, the you have bad compressor or blockages. Pressure differences between low and high sides can then tell you where blockage is, or if compressor has failed.
Sorry for the late response, I got busy and forgot to check back.

Thanks for the advice. I have yet to look at it, so I'll check everything mentioned. In the mean time, I have noticed that the lower the setting, the cooler it blows and the hissing gets quieter when I switch it to heat. I took a video of the hissing to see if anyone can listen to it and figure it out from that.

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post #6 of 6 Old Today, 01:35 AM
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Quote:
Originally Posted by Bvandam7 View Post
Sorry for the late response, I got busy and forgot to check back.

Thanks for the advice. I have yet to look at it, so I'll check everything mentioned. In the mean time, I have noticed that the lower the setting, the cooler it blows and the hissing gets quieter when I switch it to heat. I took a video of the hissing to see if anyone can listen to it and figure it out from that.

https://youtu.be/HTz7IkVHD68
Impossible to tell from here, but could be a blower going bad + a slow refrigerant leak. Although I’ve never heard a blower make a metal grinding noise like that lol. I’ll PM you my phone number. You’re more than welcome to come over and I’ll give it a look-see, throw some gauges on there. I know on my TJ, the AC is ice cold, but my blower is slowly dying. So again, you could have coincidental, but separate issues. I’m off the next 2 days, and during the days otherwise...

Also, have you verified that controls switch to foot when prompted?
Also, when defrost is on, do those little side vents that Defoe the windows come on?
Open the hood, run AC. Does the AC clutch spin (middle of the compressor)? If it spins, is it constant or clicking on and off? Or is it stable with just the belt spinning the pulley?

Last edited by Laggy; Today at 01:43 AM.
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