AC Issues in Rain

[EdP]

I had the same issue. I gave my dealer permission to take my 2018 G80 AWD Ultimate on a 1 hour plus drive. They did and the issue with the AC was duplicated. They replaced the thermistor took the car on another hour plus drive and the issue duplicated itself again. Had the thermistor replaced again. It was driven again with no issue. AC worked fine. Previous two thermistors were sent to GENESIS engineering and deemed faulty. By the way there was no charge to me at all. This was all under warranty.

Evidently your dealer is smarter and more customer oriented than mine. I go in and say if I do ABC the coil freezes. They then test it doing XYZ and say it is fine. No, you have to do ABC and the reply is we can't do that only XYZ.

I did open a case with Genesis but they have not been able to contact anyone at the dealer.

Oh, to show how competent they are they even gave me the number to call Genesis Customer Care. It was the wrong number. They gave me the number for Canada instead of the US.

Thanks for posting this though. They said they replaced a thermistor in another car and it did not fix it. When I said it could have been defective, I got a strange stare but you proved I was correct. My guess is there are many defective one out there and if all you ever do it drive local, you will never have a problem.

 

[MyG80Ride]

I'll start by stating that I love my 2018 Genesis G80 Sport! One of best cars I've ever owned with one exception.

This is probably the strangest (and most annoying car issue I've ever experienced). It's happened 3 times in the past year, so I've pretty much figured out when it will happen, but with 3 trips to the dealership, they have yet to come up with a solution.
I posted about this last year when it first happened and have video evidence of the issue. Despite calls to the corporate engineers, (they are currently looking at the issue, but so far no solution and I can't believe I'm the only one having this issue.

My car is normally garaged and the AC works fine. However, on two long road trips, after the car sat outside in the rain for a weekend while travelling, the AC will work normally until about an hour into the drive, and then something (a flap, a baffle, main AC vent, or something) freezes up and almost NO air gets into the cabin. As stated previously, you can hear the fan roaring somewhere deep in the bowels of the car, BUT NO AIR IN CABIN. The last time (3rd time) it happened, I had driven from my home and all was fine. It began to lightly ran and, in the course of an hour, the AC simply stopped delivering air into the cabin!

Just wondering if anyone else has experienced this issue. Love the car, but don't want a car that I can't drive in rain or summer. I'm no AC expert, but surely someone out there can at least figure out this cause. The morning after each event, there is a ton of water on the garage floor (much more than normal) which would again indicated something in the system massively froze up. Of course, by the time it gets to a dealer, it's working just fine and they can't recreate. Thankfully video shows the issue. Genesis corporate engineers are working on it...just wondering if anyone else has had this issue.

I just posted an answer to this problem. It is the thermistor. I authorized my dealer to take G80 for a long drive (twice) and problem was replicated both times. Initially thermistor replacements were bad. Third replacement is working just fine. It was warranty work. No cost to me.

 

[EdP]

I just posted an answer to this problem. It is the thermistor. I authorized my dealer to take G80 for a long drive (twice) and problem was replicated both times. Initially thermistor replacements were bad. Third replacement is working just fine. It was warranty work. No cost to me.

I included your post in an email I just sent to my service manager. I'm not taking any long trip for a couple of months but I don't want this happening next spring and summer when I do.

 

[MyG80Ride]

I included your post in an email I just sent to my service manager. I'm not taking any long trip for a couple of months but I don't want this happening next spring and summer when I do.

Good luck.

 

[Loved my 2013]

We have the same issues with 2018 G80. Dealership has no clue.

Update. Genesis corporate care came to the plate on this. After a lengthy “hand holding diagnosis “ between the dealership and a Genesis field engineer they replaced the compressor (?) and the thermo sensor. By the time this was flagged as the solution we had the issue with the steering “locking “ during turns & lane changes. Again a lengthy diagnosis by the dealer (they sensed the issue but were unsure if the root cause) so Genesis replaced the entire rack assembly. That’s the good news. Unfortunately the parts were all on BO. But again, Genesis stood up and had the dealership provide a replacement vehicle for ~10 days. Then the dealership wanted it back under the pretext that it was « sold » so Genesis paid for a rental for another 3 weeks. The litmus test was a 14h drive to Texas from SC and all was as it should be.
HOWEVER while gassing up on the return trip I noticed that the small piece of trim between the roof panel and the roof edge was severely weather cracked. Genesis says there’s a service bulletin on this (see pic). So I need to go to dealership and see what is to be done

 

[bubbaG80Sport]

I'm taking in my 2018 G80 to have the A/C thermistor replaced next week. For those of you who've had this replaced what was taken apart/how'd they do the replacement.

1) Remove dash?
2) Removed center dash console
3) Went through glove box.

I'm very reluctant to let my dealer do 1) or 2). I fully expect broken parts and new squeaks and creaks if this is done.

 

[EdP]

I'm taking in my 2018 G80 to have the A/C thermistor replaced next week. For those of you who've had this replaced what was taken apart/how'd they do the replacement.

1) Remove dash?
2) Removed center dash console
3) Went through glove box.

I'm very reluctant to let my dealer do 1) or 2). I fully expect broken parts and new squeaks and creaks if this is done.

I read #3 is the way to go.

I'm still arguing with Genesis Customer Support about it. They want to see it happen, as I should turn around 200 miles into my trip to show them.

 

[MyG80Ride]

I read #3 is the way to go.

I'm still arguing with Genesis Customer Support about it. They want to see it happen, as I should turn around 200 miles into my trip to show them.

I had a thermistor replaced. Didn't solve problem. (It was detective). I authorized my dealer to take my 2018 G80 Ultimate HTRAC for a drive . They did problem replicated itself. New thermistor. AC works fine. No scrapes. No rattles. No noises. This was done during the summer in Florida.

 

[bubbaG80Sport]

I had a thermistor replaced. Didn't solve problem. (It was detective). I authorized my dealer to take my 2018 G80 Ultimate HTRAC for a drive . They did problem replicated itself. New thermistor. AC works fine. No scrapes. No rattles. No noises. This was done during the summer in Florida.

For the repair did they ...
1) remove dash?
2) remove center dash console?
3) go through glove box?

This forum reports that some of the replacement thermistor's were bad. I'm going to ask the dealer to test the new thermistor before starting the repair. A quick 5 minute test is to see electrical resistance change through the thermistor while heating or cooling the thermistor.

 

[joegr]

May be of interest.

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[VA Tom]

I read #3 is the way to go.

I'm still arguing with Genesis Customer Support about it. They want to see it happen, as I should turn around 200 miles into my trip to show them.

Simple, quick and non-invasive. Part is relatively inexpensive, $20 or $20. Cured my problem with AC freezing up in rain & high humidity.

 

[bubbaG80Sport]

@joegr T You da man! Much appreciated.

 

[5.0KDM]

May be of interest.
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Hey man do u think this is bugging out my heat. my ambent temperature randomly shoots up past 100F and blows cold air. its stupid annoying in the winter.

 

[joegr]

Hey man do u think this is bugging out my heat. my ambent temperature randomly shoots up past 100F and blows cold air. its stupid annoying in the winter.

Step 5 has a typo, it should say "evaporator" instead of "ambient." I do suspect that your heating problem is related to your failing outdoor temperature reading from the sensor in the driver's side mirror. If it were me, given the high cost of the mirror, I'd either take the mirror apart and try to find and fix the failing wire (assuming it's not the thermistor itself), or maybe place an alternate sensor in front of the radiator (but behind the grill) and wire it back to where the one from the mirror connects.

 

[5.0KDM]

Step 5 has a typo, it should say "evaporator" instead of "ambient." I do suspect that your heating problem is related to your failing outdoor temperature reading from the sensor in the driver's side mirror. If it were me, given the high cost of the mirror, I'd either take the mirror apart and try to find and fix the failing wire (assuming it's not the thermistor itself), or maybe place an alternate sensor in front of the radiator (but behind the grill) and wire it back to where the one from the mirror connects.

THANK YOU MAN!! You are a wealth of knowledge. Im glad your on this forum!

 

[bubbaG80Sport]

I rarely drive more than 1 hour in my 2018 G80 3.3T Sport. August 2021 I took a 500 mile/8 hour trip with A/C running the entire time. After about 3 hours A/C airflow was reduced and air was warm/not cool. Turning off the A/C for 5 minutes and then back on resolved the issue for about 15 minutes and then issue reoccurred.

Anybody have details on how to replace this thermistor (part number, diagrams, instruction video, etc.). I can "turn a wrench" and would prefer fixing myself versus dealing with stealership.

This weekend I tested my thermistor. It was relatively easy to remove the thermistor. Remove the 2 round disks (counter/anti-clockwise I recall) on the interior of the glove box and disconnect the "soft opening" arm on outside right of glove box to lower/drop glovebox. This will give you access to the thermistor on the left/engine side of the glove box compartment. There is a metal bracket which makes it tough to get your hand on the thermistor. Be careful so you don't cut your self. I removed the connector and twisted the thermistor counter/anti-clockwise about 90 degrees.

I heated water to 104F and gradually added ice checking the resistance on the thermistor as water temperature decreased. It was in specifications (see post #110 above) from 104 -> 50F. Below 50F ohm-meter showed an "open" reading. This indicated to me the thermistor is faulty.

I plan to purchase a replacement part and test before replacing as there are reports in this forum on replacement/new thermistors also being bad.

HVAC Evaporator Temperature Switch - Hyundai (97614-B1000) $19.06USD plus shipping.

2014-2020 Hyundai HVAC Evaporator Temperature Switch 97614-B1000 | OEM Online Parts

Genuine OEM Hyundai HVAC Evaporator Temperature Switch for select 2014-2020 Hyundai vehicles. Part # 97614-B1000 (97614b1000). International variants available upon request.

www.oemonlineparts.com

Many thanks to @joegr for the technical information on this issue.

 

[TinsleyC]

Great post bubbaG80Sport, thanks!

 

[bubbaG80Sport]

I heated water to 104F and gradually added ice checking the resistance on the thermistor as water temperature decreased. It was in specifications (see post #110 above) from 104 -> 50F. Below 50F ohm-meter showed an "open" reading. This indicated to me the thermistor is faulty.

Correction/retraction.
I have an OLD multimeter (very reliable/still works) that does not have auto ranging. Initial testing was done at 20 K-Ohm maximum. When the thermistor resistance increased >=20 K-Ohm at around 49F the multimeter showed open/out of range. This was not a part, multimeter failure, but a an operator error. It's frequently the carbon life form behind the keyboard not the computer that is the root cause of a problem

I re-ran the test with multimeter range at max. 100 K-Ohm and the resistance was in specification between 39F and 100F. I couldn't easily test below 39F. I didn't want to stick thermistor and multimeter in freezer. . I have gotten rather proficient at removing/re-installing the thermistor having done it 3->4 times.

For now it appears my thermistor is working properly and I will monitor for the issue going forward. I rarely see the warm air/reduced airflow, because I don't drive with A/C on for 2->3 hours continuously very often.

 

[R514]

I got this issue, taking my 2018 g80 into the dealership today with that print out from post 61. Fingers crossed they fix it.

 

[EdP]

Genesis customer service FAILED again. I had an appointment to have a field service engineer be at the dealer to check and resolve the AC problem. It had to be changed since the rep had surgery so, no problem, delay. I notified Genesis of the new date and they thanked me for letting me know.

So, I go to Gettel today and, they know nothing of it. No field service, no nothing. Customer service never notified anyone. The service manager will do nothing for me as he does not think it is the thermister. Of course, he does not know the real problem, just keeps insisting it is not the part I suggest.

Twice they spend time checking thing to no avail. In the time spent it would have been much cheaper for them to at least pull the thermister and check it with some ohm reading but no, nothing. I have the specifications but he did not even look at them. He does not think a forum knows anything in spite of the fact that many here had their problem solved.

I emailed customer service but if typical, it will be a long time to hear back. Certainly not a luxury experience with a luxury automobile brand. I have a 2500 mile trip coming up in a couple of weeks and it would be nice to have climate control.

A copy of this post will also be sent to both parties so I'm not going behind their back but everyone should know of the inability to properly fix their cars and keep a long time Hyundai/Genesis customer happy.
To Be Continued. . . .