AC Not Cold Enough - JeepForum.com
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post #1 of 15 Old 05-14-2021, 06:48 AM Thread Starter
gunterkaiser
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AC Not Cold Enough

Hey everyone,
Two weeks ago, I noticed that the AC was not as cold as it used to be while driving in my 2011 Jeep Grand Cherokee. Normally, it takes 3-4 minutes for AC to cool off, and it was really cold so I was using the fan speed below the medium speed. Once I noticed that the AC is not as cold as it used to be, I took it to the service at the dealership. They told me that nothing is wrong with the AC, and the temperature is 46-47 degrees. I even took a friend to test drive who travels in the car a lot (and always complained that the AC was too cold, and turned off air vents on passenger side) and he told me that the AC is not as cold as before.

The AC is blowing cool air, but it is not getting cold as it used to be... The service guy told me that they did/check everything (freon check, dye for leak, etc) they can and the air temperature was always consistent around 46-47. But, I know that I am not making up an AC issue, because it was way colder than now, and it was making my hands and face like ice. Now, I have to use the AC at high speed to get some relief while driving.

My question is that since the service at the dealership cannot find anything wrong with the whole AC system, what should I do? What could be the problem that AC is not as cold as it used to be. Should I take it to another Jeep service or friendly neighborhood shop?

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post #2 of 15 Old 05-14-2021, 08:33 AM
Fast55
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Definitely get another opinion. In fact, if you have a dedicated auto/truck A/C specialist in your area, I would go there instead. My guess is the system is contaminated and/or slightly low on charge. If there are no obvious issues, you could still benefit from a complete evacuation and recharge of the system by weight, not system pressures. Most automotive A/C systems are extremely sensitive to refrigerant charge and a few ounces in either direction will make a noticeable difference in how it performs.

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post #3 of 15 Old 05-14-2021, 05:37 PM
danelo
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As the temperature outside goes up the lowest temperature that the AC is able to output will go up. That could be the only issue you are having.
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post #4 of 15 Old 05-14-2021, 07:13 PM
Bilko
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You could try one of the off-the-shelf, aerosol can, recharge kits such as AC Pro, if it's a 2011 you need R134A refrigerant.

Do not consider this a permanent fix, it's more like a diagnostic tool. If you do the recharge and it runs cooler you know your refrigerant was low. But this would also confirm you do have a leak and needs to be addressed. Usually, on WK2s it's likely to be the condenser that sits in front of the main radiator or the compressor. The compressor is a more common failure if you live somewhere it's colder and you don't use the AC for extended periods. The coolant works as a lubricant and if you don't regularly run the AC, the compressor seals can fail in older vehicles.

Actually, thinking about this, if you have had the AC system tested and there are no obvious leaks, it could be the Blend Doors that direct the hot and cold air to the various outlets inside the vehicle. Diagnosing faults with these is not something I am familiar with.
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post #5 of 15 Old 05-24-2021, 05:28 PM
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Did you ever solve this issue? It's a spooky coincidence but I had the same issue on a trip we took this weekend. Pressing the AC button seemed to make no noticeable difference to the air temp coming out of the interior vents. I checked the refrigerant using an old AC pro kit I had lying about and it showed good pressure/fill in the middle of the green zone. I checked the compressor and the clutch was engaging and it was running. The low-pressure AC coolant pipes felt cold. This suggested it was a blend door issue so I tried a hill billy repair, Fan on full, then I cycled through all the vent outlet options by pressing each button, waiting 30 seconds between changing modes then turning AC on and off and recirculate on and off. And it worked, nice cold air. I am just hoping this was a glitch rather than an impending blend door failure.
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post #6 of 15 Old 05-24-2021, 10:19 PM Thread Starter
gunterkaiser
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Hey everyone,
Thank you for your replies.
I have an update on the issue. I took my Jeep to a shop specialized in AC repairs. First of all, they listened me and believed that there was an issue with the AC. I told them everything that was done in the service on the AC.
It took them 30 minutes to figure out the problem. There was a leak inside the evaporator. They told me that the service could not figure it out because putting dye in the system would not work on this type of leak. They even told me that the freon was lower than what it was supposed to be which the dealership service did not check/confirm apparently.

They are replacing the evaporator, and I am hoping to get my jeep back in 1-2 days. And, I confirmed again to trust my judgement...
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post #7 of 15 Old 05-24-2021, 10:23 PM Thread Starter
gunterkaiser
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That's exactly what they told me at the service. I live in Florida, and it started to get hotter.
Though, I have been living in Florida and driving my Jeep since 2011, and never had a similar experience before. As I stated in my update, there was a leak in the evaporator and that's why the AC was not as cold as before.
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post #8 of 15 Old 05-24-2021, 10:24 PM Thread Starter
gunterkaiser
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Quote:
Originally Posted by danelo View Post
As the temperature outside goes up the lowest temperature that the AC is able to output will go up. That could be the only issue you are having.
'

That's exactly what they told me at the service. I live in Florida, and it started to get hotter.
Though, I have been living in Florida and driving my Jeep since 2011, and never had a similar experience before. As I stated in my update, there was a leak in the evaporator and that's why the AC was not as cold as before.
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post #9 of 15 Old 05-25-2021, 07:51 AM
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I just added some more R-134 to my system. I just keep a cheap gauge and hose for the small cans you can get for $6. Maybe add 12 oz a year.

I was going to say maybe the blend doors may not be working. Controlling the temperature that is. Mine had this problem when I bought it used.
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post #10 of 15 Old 05-25-2021, 11:56 AM
Bilko
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Quote:
Originally Posted by gunterkaiser View Post
Hey everyone,
Thank you for your replies.
I have an update on the issue. I took my Jeep to a shop specialized in AC repairs. First of all, they listened me and believed that there was an issue with the AC. I told them everything that was done in the service on the AC.
It took them 30 minutes to figure out the problem. There was a leak inside the evaporator. They told me that the service could not figure it out because putting dye in the system would not work on this type of leak. They even told me that the freon was lower than what it was supposed to be which the dealership service did not check/confirm apparently.

They are replacing the evaporator, and I am hoping to get my jeep back in 1-2 days. And, I confirmed again to trust my judgement...
Sounds like a good outcome.

Just to be clear, the AC evaporator, is that the condenser that sits in front of the radiator, or is the matrix/heat exchanger that is buried behind the dashboard?
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post #11 of 15 Old 05-25-2021, 02:26 PM
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I have a 2019 GC Laredo and started to experience the same thing. However, the new refrigerant is R1234yf. 134a is not compatible. You can find the new stuff at most auto parts store. It's a little more expensive, but worth it. I wound putting close to half a can in my system and it's so much better now.
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post #12 of 15 Old 05-25-2021, 02:41 PM
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Quote:
Originally Posted by Bilko View Post
Sounds like a good outcome.

Just to be clear, the AC evaporator, is that the condenser that sits in front of the radiator, or is the matrix/heat exchanger that is buried behind the dashboard?
The evaporator is the in-dash coil that gets cold as opposed to the condenser that dumps the heat from the cabin in front of your radiator. Having an evaporator leak would be nearly impossible to find with dye since you can't see much of it.

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post #13 of 15 Old 05-25-2021, 03:15 PM
Bilko
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That sounds expensive because of the Labor involved, I guess that why it's a 1-2 day job plus a refrigerant recharge.

This also highlights the benefit of finding a shop that actually knows what they are doing. Your typical dealer would swap every easily accessible part and charge you for it before fixing the more challenging, underlying problem.

gunterkaiser you may want to name the shop you used so other local Jeep owners can use them in the future.
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post #14 of 15 Old 05-26-2021, 08:53 AM Thread Starter
gunterkaiser
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Quote:
Originally Posted by Bilko View Post
That sounds expensive because of the Labor involved, I guess that why it's a 1-2 day job plus a refrigerant recharge.

This also highlights the benefit of finding a shop that actually knows what they are doing. Your typical dealer would swap every easily accessible part and charge you for it before fixing the more challenging, underlying problem.

gunterkaiser you may want to name the shop you used so other local Jeep owners can use them in the future.
Thank you for the suggestion. I took my Jeep to get a second opinion at Ice Cold Air Discount Auto Repair. I suggest people having similar issues to get a second or third opinion, definitely!
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post #15 of 15 Old 05-27-2021, 10:29 AM
Roadijeff
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My 2018 HA started showing problems the other day with the AC not being near as cold as it once was. I tried the hillbilly repair, as was mentioned in a previous reply, but it made no difference. Since I have the lifetime MaxCare warranty, I will be making an appointment with the dealer in the near future to get it fixed. The most it will cost me is a $100 ded. I hope they don't just add refrigerant and say it's been fixed because if it is low it leaked out of somewhere.
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