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Discussion Starter #1 (Edited)
HVAC, low refrigerant .. AGAIN ?

Just returned from a 500 mile trip, AC slowly losing its coldness.
By yesterday it was only cooling on driver vents.

Going to Chev dealer this week, but thinking they may need some advice?
Car 100% maintained by Chev dealer, except one refill done in Jan, on da road DIY, just to get us home.
Car has been to dealer several times on AC complaints, so far no $$ repair charges.

Every time, the cold air 1st stopped on passenger side, keeping driver side going almost another week as long as it was set at 60F, with manual fan speed; then no cold air anywhere - so I assume compressor shuts down due to low refrigerant.

DEALER has checked for leaks several times, none found.

History, THREE refills that I know about,
one back in 2016, about 9,000 miles, dealer.

last two:
16,800 miles, 01/2019, dealer
15,500 miles, 06/2017, DIY

other cars in the family have had ZERO AC issues, including a '92 and a '87, still running on original everything - something is wrong that needs repair.

thanks in advance for any help


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Is the drivers side still cold, or just remotely cool? I had a random icing of my evap core during a road trip last summer. I don't know if the temp/ humidity were perfect that weekend or what, but it seemed to happen in auto mode mostly. Upon returning home, and after checking for leaks (I found none), both with a UV light and a Halogen gas leak detector (sniffer), I evacuated the system to find it a couple ounces low. I don't believe it to be enough to cause the icing that I experienced as it only did it that one time. I refilled with proper charge and decided to check AC system live data. I found the evap core temp sensor was reading erroneously; about 10* above ambient, so I replaced it and all has seemed well so far, though that was late last summer and wasn't scorching hot when I did it, so I've not had opportunity to test the AC output since then.

The Auto mode in this car seems so fickle compared to my other vehicles. My truck, by contrast, performs flawlessly year round. Set it like a house thermostat and forget it. The SS always seems to be blowing too high or low, or too cold/ hot, so I've been using manual controls all winter and it seems to work best for me.
 

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Discussion Starter #4
My first thought is that you may want find a more competent dealer.

Also, you may want to check the A/C lines as it appears to be a weak point:

https://www.ssforums.com/forum/warranty-service-issues/188813-leaking-hvac-ac-line.html
YUP .. if they try to charge me, that may well be the outcome.



Is the drivers side still cold, or just remotely cool? I had a random icing of my evap core during a road trip last summer. I don't know if the temp/ humidity were perfect that weekend or what, but it seemed to happen in auto mode mostly. Upon returning home, and after checking for leaks (I found none), both with a UV light and a Halogen gas leak detector (sniffer), I evacuated the system to find it a couple ounces low. I don't believe it to be enough to cause the icing that I experienced as it only did it that one time. I refilled with proper charge and decided to check AC system live data. I found the evap core temp sensor was reading erroneously; about 10* above ambient, so I replaced it and all has seemed well so far, though that was late last summer and wasn't scorching hot when I did it, so I've not had opportunity to test the AC output since then.

The Auto mode in this car seems so fickle compared to my other vehicles. My truck, by contrast, performs flawlessly year round. Set it like a house thermostat and forget it. The SS always seems to be blowing too high or low, or too cold/ hot, so I've been using manual controls all winter and it seems to work best for me.
Well, driver side cool, not really cold.




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Discussion Starter #5 (Edited)

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Could be one or more of the temperature control sensors in the airbox behind the center stack. That's not such good news either if that's the culprit. There are a few posts on the subject somewhere in here.
 

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I also had mine freeze up once last summer. I took it off of recirculation and turned off the AC for a few minutes. It worked again after a little while and haven't had any trouble since.
 

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YUP .. if they try to charge me, that may well be the outcome.





Well, driver side cool, not really cold.




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Since I noticed the leak on mine, my AC still blows cold on the driver side but the passenger is noticeably warmer. Not sure on the reason for this but I assume it's related. Have an appointment for Saturday to have the line replaced.
 

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Discussion Starter #12 (Edited)
I do thank you for all the responses, but ...
going by the responses, some missed the main point of the issue.
Not a sensor, not intermittent, not software - when it failed, it had to be refilled.
system had to be refilled several times - and now, it needs refilling AGAIN.
So the car either digested refrigerant or it leaked - but, where?

Could the compressor be leaking and if so, where might one physically spot the dye leak?
I got my UV light ready, but I don't see dye anywhere.

my gut feeling is that I can still get dealer tech to find the leak/issue and doing a proper fix before I get the "out of warranty / can't do cust satis" response from Service Mgr.


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Could the compressor be leaking and if so, where might one physically spot the dye leak?
I got my UV light ready, but I don't see dye anywhere.

my gut feeling is that I can still get dealer tech to find the leak/issue and doing a proper fix before I get the "out of warranty / can't do cust satis" response from Service Mgr.

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It can leak from almost anywhere, hoses to it, seals around it. Most likely out the front seal though. Look right in the center of the pully.

Don't forget the condenser up front too.

Are you sure it has dye? Might just be newer models that have it.
 

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Discussion Starter #14 (Edited)
It can leak from almost anywhere, hoses to it, seals around it. Most likely out the front seal though. Look right in the center of the pully.

Don't forget the condenser up front too.

Are you sure it has dye? Might just be newer models that have it.
thanks for the spots to check ...

I do not know for sure on the dye. A previous post here says it does, but I also found a post elsewhere commenting that dye was put into the '15 and on. Mine is an early '14, made in Oct 2013.

Maybe I should run to parts and get Fluorescent Dye into system before taking car in?


Gm/Ac Delco 4 In 1 Fluorescent Dye - 1 Oz.
Multipurpose fluorescent leak detection dye is used in conjunction with ultraviolet or UV/blue light lamps to pinpoint leaks in oil and oil based fluid systems.

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thanks for the spots to check ...

I do not know for sure on the dye. A previous post here says it does, but I also found a post elsewhere commenting that dye was put into the '15 and on. Mine is an early '14, made in Oct 2013.

Maybe I should run to parts and get Fluorescent Dye into system before taking car in?


Gm/Ac Delco 4 In 1 Fluorescent Dye - 1 Oz.
Multipurpose fluorescent leak detection dye is used in conjunction with ultraviolet or UV/blue light lamps to pinpoint leaks in oil and oil based fluid systems.

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You would need a way to get the dye in there. Now that I think about it you said it has been filled before? If so, they may have put dye in it already. Also, it is possible it is not low this time, could be something else. But the diagnoses will start with refrigerant level.

If you really want to put dye in it there are relatively cheap "kits" to add dye and refrigerant. I don't like them because these things don't show you high side pressures which makes me nervous, but since they make them I'm guessing thousands of people use them all the time and don't get hurt. If you do it at the very least WEAR EYE PROTECTION and gloves.

Although I love the DIY thing, I do recommend taking it to someone who knows what they are doing too.
 

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I do thank you for all the responses, but ...
going by the responses, some missed the main point of the issue.
Not a sensor, not intermittent, not software - when it failed, it had to be refilled.
system had to be refilled several times - and now, it needs refilling AGAIN.
So the car either digested refrigerant or it leaked - but, where?

Could the compressor be leaking and if so, where might one physically spot the dye leak?
I got my UV light ready, but I don't see dye anywhere.

my gut feeling is that I can still get dealer tech to find the leak/issue and doing a proper fix before I get the "out of warranty / can't do cust satis" response from Service Mgr.


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No way a competent A/C tech refills your system and doesn’t add dye to it. Just call the dealer that filled it the first time and ask them.
 

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Will it have dye if it has been refilled several times and no dye was added it may not have dye. If you have an AC service center go to them and pay for check it out and let you know what it needs then proceed to dealer of your choice. You may have trouble with a sensor also. CB750 can shed some light on this also knowing what I know about his back ground.
z51vett
Doug
 

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To properly diagnose a check of all control components must be done.

Second; that being said; from the symptoms it has a slow SEEP. That is if the pressure was low when it stopped cooling.

You don't just "gas and go". Whether a visible leak is found or not a low/empty system needs a full evac; vacuum pulled (which is a good way to test for a small seep or make it worse when you gas it back up) and then refilled with the proper amount of gas and oil if called for.

Slow seeps are a PIA to find. Good luck.
 

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Discussion Starter #19
before this I was convinced problem was resolved, only to have it go again a few months later.

hopefully, this time will be the final resolution.

thanks for all the responses.


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Discussion Starter #20 (Edited)
SS is 2 hrs from where I am, had a friendly local mechanic there, who doesn't do AC, take a courtesy quick look ...
Said, Dealer didn't find this? He didnt even run engine, just opened hood and hit it with UV light.
Its the hose that goes to the refill nipple by radiator.

Recommendations?

Should I battle with "dealer"
Should I contact GM?
Should I trow in the towel and have a local AC shop fix it on my coin?

AC is putting out almost no cold air, any setting .. blowers blow.

20190507_142922.jpg 20190507_142915.jpg 20190507_142926.jpg

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