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AC not blowing cold air

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air condition cold
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874 views 8 replies 5 participants last post by  brycemartinez  
#1 ·
I own a 2020 VN with about 75,000 miles on it and live in San Antonio, Texas. A few weeks ago, my AC stopped blowing cold air, so I took it into the dealership for an AC diagnostic, which cost me $250 (up from their usual $170). They quoted me $2,100 for the repair, which was mostly made up of $1,850 in labor (8.5 hours).


I spoke with the tech, who said he ran the standard AC tests, and everything was working fine. He then showed me his diagnostic screen which displayed the EVAP - Evaporative Vapor Pressure sensor at -2 degrees Celsius (28F degrees ) which was way off as the ambient air temp was reading 53F degrees. Because of this incorrectly low reading from the sensor, the AC isn't blowing cold air.


The tech said to get to the sensor to replace it, he would have to tear the whole dash apart which is why the labor quote is so high. He also noted that he was able to unplug the sensor from the outside (not tear apart the whole dash) and plug in a new one to confirm that the sensor was, in fact, faulty. He also said faulty EVAP sensors are common on some of the N vehicles as well as hyundai Tuscans.

Has anyone dealt with this or replaced the sensor themselves?
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#4 ·
It's 5 years or 60,000 miles, whichever comes first. So because you're at 75,000 miles that means your New Vehicle Limited Warranty coverage is over.

You should probably ask for a second opinion because they are quoting you a full days labor for something the tech could reach from outside. I'd request to only replace the sensor using the access method the tech already used. And if you’re mechanically-inclined, you may be able to do it yourself.
 
#6 ·
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Update July 2025 - My friend and I were able to replace the EVAP sensor and ended up replacing the EVAP core aswell as it made sense to do so. The hardest step was one of the first steps which involved unscrewing the cover bolt and two more EVAP bolts that are located behind the turbo on the firewall. We took off the intake, inlet, battery, unplugged the heater core and bungy corded lines out of the way to get enough clearance to get a wrench in. Taking the interior apart was honestly not terrible compared to this step. After taking the seats, lower dash, steering wheel, gear assembly and a pillar dash covers the resh of the dash pops out as one huge unit. Total it probably took about 20 hours to complete, it sucked but I saved a lot doing it myself. If anyone has to do this install shoot me a message and I can give some tips.
 
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