AC cycles from cold to cool back to cold every 10 seconds or so... - Jeep Garage - Jeep Forum

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  #1  
Old 06-20-2016, 11:20 AM
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AC cycles from cold to cool back to cold every 10 seconds or so...

The other day it was about 90 and sunny and I had the AC on Auto, set to about 66F or so - so the fans were running at high speed. I had them pointed at my hands and face and noticed that the air coming out would be very cold for about 10 seconds or less, and then the air would become just cool for about the same period of time, then it would become cold again, and this kept repeating the entire time.

I turned off Auto mode and the same thing occurred.

Is this normal / does anyone else's do this? My 3-year warranty expired, so I hope so. I know my AC has always made the "darth vader" noise about every 10 seconds (wondering if it's related) but I'm not sure it's always done this - although it could simply be because I never used to point the vents at my hands and face so I didn't notice the temperature fluctuation (although I have also always noticed that my AC's performance has always been underwhelming).

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Old 06-20-2016, 05:02 PM
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Re: AC cycles from cold to cool back to cold every 10 seconds or so...

I've had that frustration with the jeep climate control since I bought it. It's been inferior to my Ford sport trac's previous climate control in that regard exactly. I notice it on road trips even when it's not pointed at my face, it's uncomfortable. I find it also either hot or cold when selecting temperatures instead of modifying the air temp coming from the vents
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Old 06-26-2016, 08:46 AM
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AC cycles from cold to cool back to cold every 10 seconds or so...

Mine has done this since day one, very annoying. Even when set to "LO" it still cycles between blowing ice cubes to just cold air. Next time I'm in for an oil change I'm going to ask if this is common.

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Old 07-01-2016, 07:05 PM
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Re: AC cycles from cold to cool back to cold every 10 seconds or so...

I'm on my second '16 WK2, both exhibit this behavior and it drives me nuts now that it's approaching 100 in Texas - couple this with the fact that the pano roof is essentially a radiant heater and I'm not so happy. I can't imagine this is some design fault. The AC compressor is either on and cooling or turning off for a split second and dropping pressure causing this.

I am never comfortable in this car when the temps are over 90, not even at max AC. Did they even bother hot weather testing this car in its development stage?

Has anyone gotten this remedied?
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Old 07-01-2016, 07:34 PM
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Re: AC cycles from cold to cool back to cold every 10 seconds or so...

Quote:
Originally Posted by JeepersCreepers View Post
The other day it was about 90 and sunny and I had the AC on Auto, set to about 66F or so - so the fans were running at high speed. I had them pointed at my hands and face and noticed that the air coming out would be very cold for about 10 seconds or less, and then the air would become just cool for about the same period of time, then it would become cold again, and this kept repeating the entire time.

I turned off Auto mode and the same thing occurred.

Is this normal / does anyone else's do this? My 3-year warranty expired, so I hope so. I know my AC has always made the "darth vader" noise about every 10 seconds (wondering if it's related) but I'm not sure it's always done this - although it could simply be because I never used to point the vents at my hands and face so I didn't notice the temperature fluctuation (although I have also always noticed that my AC's performance has always been underwhelming).
Concerning the performance being underwhelming my 2014 was like that it cooled but did not cool well when it got fairly hot. I lived with it like that for around 2 years then took it in and they determined that it was undercharged from the factory. they charged to proper levels (under warranty)and its been fine the last year and a half.
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Old 07-01-2016, 07:50 PM
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Re: AC cycles from cold to cool back to cold every 10 seconds or so...

FYI, starting in 2014, Jeep started using the new R-1234YA refrigerant that is a little less efficient than R-134A. I've been pretty underwhelmed with mine on the really hot days so far. I had them check it when I had the new shifter recall done, and they claimed it was blowing 47F on max A/C, in the shop, on an 80F day. They said that was within spec. I say BS!! I always keep a thermometer in the left vent of all my cars, and until this one, they would have no trouble getting down to 40F and under on Max or recirc. I have yet to see it go below 50 (they took their reading from the center vents). I think the system is capable of getting cold, it's just software making the compressor cycle off too soon. Maybe to keep it from freezing up in humid climates, I don't know.

I think all modern vehicles just don't blow the ice cold air they used to.
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Old 07-01-2016, 08:30 PM
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Re: AC cycles from cold to cool back to cold every 10 seconds or so...

Quote:
Originally Posted by DriverDave View Post
FYI, starting in 2014, Jeep started using the new R-1234YA refrigerant that is a little less efficient than R-134A. I've been pretty underwhelmed with mine on the really hot days so far. I had them check it when I had the new shifter recall done, and they claimed it was blowing 47F on max A/C, in the shop, on an 80F day. They said that was within spec. I say BS!! I always keep a thermometer in the left vent of all my cars, and until this one, they would have no trouble getting down to 40F and under on Max or recirc. I have yet to see it go below 50 (they took their reading from the center vents). I think the system is capable of getting cold, it's just software making the compressor cycle off too soon. Maybe to keep it from freezing up in humid climates, I don't know.

I think all modern vehicles just don't blow the ice cold air they used to.
My 2014 GC must have made it right before the cut off I still have R-134a in mine. I thought R-134a was supposed to be the wonderful savior from the "evil" R-12. So now R-134a is the evil and R-1234YA is the savior? So that means the price of R-134a will start going through the roof like R-12 did? I smell a rat.
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Old 07-01-2016, 08:33 PM
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Re: AC cycles from cold to cool back to cold every 10 seconds or so...

My old early built (2/2013) 2014 Summit has the R-134A refrigerant. The A/C in it never performed as well as the one in my previous 2012 Overland. About 2 years ago, I had the dealer check it, and it actually had 1.6 ozs. to much refrigerant. So they evacuated and recharged with the proper amount and while it's improved, it still doesn't work like it should. But since we don't get very hot temps (rarely above 80) around here very often, it is ok for now.
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Old 07-03-2016, 02:27 AM
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Re: AC cycles from cold to cool back to cold every 10 seconds or so...

Quote:
Originally Posted by silvermax04 View Post
My 2014 GC must have made it right before the cut off I still have R-134a in mine. I thought R-134a was supposed to be the wonderful savior from the "evil" R-12. So now R-134a is the evil and R-1234YA is the savior? So that means the price of R-134a will start going through the roof like R-12 did? I smell a rat.
R134a will still be made, therefore prices should stay stable. R1234yf has a much lower global warming potential (GWP) than R134a which is already being phased out as an automotive refrigerant in Europe.

Keep in mind however, many of the "canned air" dusters are just cans of R134a. It's not going anywhere any time soon. The environmental consequences of release are nowhere near as bad as R12 so there's no push to ban manufacture. Just like R12 cars, in 25 years most R134a cars will have been sent to the crusher and demand will be very small.
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Old 07-03-2016, 07:15 AM
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Re: AC cycles from cold to cool back to cold every 10 seconds or so...

Quote:
Originally Posted by DriverDave View Post
I had them check it when I had the new shifter recall done, and they claimed it was blowing 47F on max A/C, in the shop, on an 80F day. They said that was within spec. I say BS!! I always keep a thermometer in the left vent of all my cars, and until this one, they would have no trouble getting down to 40F and under on Max or recirc. I have yet to see it go below 50 (they took their reading from the center vents). I
That is proper performance, per the chart in the (2014) FSM
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Old 07-03-2016, 11:24 AM
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Re: AC cycles from cold to cool back to cold every 10 seconds or so...

Quote:
Originally Posted by MBDiesel View Post
R134a will still be made, therefore prices should stay stable. R1234yf has a much lower global warming potential (GWP) than R134a which is already being phased out as an automotive refrigerant in Europe.

Keep in mind however, many of the "canned air" dusters are just cans of R134a. It's not going anywhere any time soon. The environmental consequences of release are nowhere near as bad as R12 so there's no push to ban manufacture. Just like R12 cars, in 25 years most R134a cars will have been sent to the crusher and demand will be very small.
I still have the bad memories of buying a new car in the early 90s that used R-12 and 7 or 8 years later paying $40 for a 99 cent can of R-12 and doing it myself because the shops wanted hundreds for the recharge. It seems I bought that car right at the phase out point of R-12 just like I bought this jeep right at the phase out point of 134a. 134a may not be as bad because they will continue to make it but I read it would be heavily taxed to avoid frivolous use of it so time will tell how much that will be for a charge or how much a shop will exaggerate the cost because its considered the "old" one.

Mercedes apparently does not like the flammability of R-1234yf and is moving some of their cars to CO2 (R-744) systems in 2017, I think it said VW and Audi were looking at that also. So it sounds like CO2 systems will be the "new" systems. Maybe R-1234yf will be a short lived transition
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Old 07-05-2016, 10:17 AM
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Re: AC cycles from cold to cool back to cold every 10 seconds or so...

The cycling is necessary to prevent freezing of the A/C compressor. Every car I've had does that. On the Subaru, it is pretty obvious because the compressor is belt driven and you can see its spinning-stopping cycle. Obviously when there is a high temperature differential between the outdoors and what you are trying to achieve inside the vehicle, this behavior will be felt at the vents.
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