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HELP! AC issues w/2019 Tundra

Discussion in '2.5 Gen Tundras (2014-2021)' started by Impulsefishing, Aug 2, 2022.

  1. Aug 2, 2022 at 3:54 PM
    #1
    Impulsefishing

    Impulsefishing [OP] New Member

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    Hi everyone! I am new to the forum. Hoping to find a good mechanic on here that is familiar inside and out with the AC system on the 2019 Tundras. I hit a deer going about 30mph. Front end damage was the typical bumper, grill, head light, radiator, and a bunch of brackets, etc. I took the truck to the body shop. They replaced all damaged components. One of them being the AC line that has a sensor mounted to it. I get my truck back and noticed a couple days later that if I start my truck and let the AC run it would only blow hot humid air. This is while the truck was in park. If I put it in drive and go down the road, I would eventually hear a click around 30-40mph and then I would have instant ice cold air. If I slowed down and stopped at a light or stopped for fast food my truck would start blowing hot humid air again. So, I took it back to the body shop. They found a code saying the sensor on the AC line that they replaced was bad. They replaced the sensor again. The code went away but the issue was still there. So they took the truck to the local Toyota dealer. The dealership had the truck for 3 days and couldn’t duplicate the problem. They then tried to tell me that was normal operation and if they changed anything it would be the sensor again. My body shop went a picked the truck up then decided to put my old original sensor back on the truck. They said the only reason it got replaced was because the bracket that is attached to the sensor and line was damaged from the deer. So the old sensor went back on. I’ve had the truck back for 2 weeks now with no issues. Then today I go to leave from work and the AC wasn’t getting cold. Start driving down the road and set a timer. Took exactly 10min then I heard something click and instant ice cold air. I get home, put the truck in park and within 1 minute it started to get warmer. I left it running, went inside, came back 5min later and the truck was blowing hot humid air. My body is out of ideas and wants to take it to a different dealership. Help please! I’ve never had this issue prior to hitting that deer. Body shop says there wasn’t any other AC components that were damaged by the deer. One more thing that I noticed. The hotter it is outside, the more it happens. I did have 3 days last week over 92 degrees outside and it worked fine. Today was 96. The Freon was all checked by the body shop and again by the dealership. I know when I take it to the next dealership they probably won’t be able to duplicate it. Can anyone help diagnose this? Thanks!

    Ryan
     
  2. Aug 2, 2022 at 4:03 PM
    #2
    MadMaxCanon

    MadMaxCanon New Member

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    Too many, but not enough....
    Did you check the ac system relay? I had a similar problem on a previous truck and it was a bad relay.
     
  3. Aug 2, 2022 at 4:11 PM
    #3
    Impulsefishing

    Impulsefishing [OP] New Member

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    No I haven’t messed with anything since it’s still considered to be covered under insurance due to the deer. Neither the body shop or the dealership mentioned anything about a relay. This would make since because when it comes back on I hear a click and then the air is instantly cold. I just don’t understand why it would start to blow hot again once I slow down or put the truck in park. I will definitely have them look into the relay though.
     
  4. Aug 5, 2022 at 2:40 AM
    #4
    ubserved

    ubserved New Member

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    I feel for you. That said, the AC in these Tundras aren't that great to begin with. I have had numerous other makes of pickups over the years and the AC in them would go from zero to morgue in less than 15 seconds or so. I had a remote start installed with my alarm system just so I could pre cool the cabin for five minutes before I would leave because down here in Texas, it gets HOT. Being on this topic, I know it's not a fix for the OP, but any suggestions on how to get the AC to be more responsive? Meaning is the factory freon just not all that great? Is there an aftermarket product that would be better to swap out to?
     
  5. Aug 5, 2022 at 6:33 AM
    #5
    Buckaroo

    Buckaroo New Member

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    Tough to diagnose an intermittent problem - needs to be "doing it" when your testing. By the sensor, I think you mean the ambient temperature sensor. It is located low on the front of the condenser. Wiring issue can also generate sensor code so I would do a visual on that wiring and do a wiggle test when the ac is running and see if it cuts out. Would also do a visual on the air conditioning pressure switch and wiring which is a little higher on the condenser. Wiggle test that, too. Have attached schematic showing where they are located. Might want to just replace the relay to take that off the table - cheap and easy to do.
     

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    texasrho83 likes this.
  6. Aug 5, 2022 at 7:28 AM
    #6
    ScenicRoute

    ScenicRoute New Member

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    Really strange. Sorry I can’t be of more help. My initial check would be refrigerant level. But I guess that was confirmed.
     
  7. Aug 5, 2022 at 12:48 PM
    #7
    Impulsefishing

    Impulsefishing [OP] New Member

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    Replaced AC Magnetic Clutch relay and it’s still doing it. Any other ideas? Magnetic clutch going out? Wiring? Any other sensors for the 2019 that might be the culprit? So far the issue has happened the last 4 days in a row. If I’m looking at the correct part then the AC magnetic clutch is not engaging when the truck is in park. If I drive and get above 40-50mph then the cold air will start coming through. If I slow down below 15-20mph for more than a minute or 2 then it starts blowing hot air and will not recover until I get back up over 40-50mph.
     
    Last edited: Aug 5, 2022
  8. Aug 5, 2022 at 7:28 PM
    #8
    panicman

    panicman Everyone remain calm.

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    Man. That his the weirdest issue with AC I think I’ve heard of. Please post the solution when you find it.
    And next time… wait until at least November!
     
  9. Aug 6, 2022 at 4:35 AM
    #9
    Buckaroo

    Buckaroo New Member

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    Yes, AC pressure switch per post #5 above.
     
  10. Aug 6, 2022 at 4:59 AM
    #10
    07DCLimited

    07DCLimited New Member

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    Have the system leak fully checked and have the charge level checked. If necessary, have UV dye added and then check for leaks, focusing on the condensor. and the AC lines themselves. The connection to the compressor should be cleck closely as well, as the shock of the impact may have cracked the compressor or the connection points, causing a small leak. Did the body shop use Genuine Toyota parts, or aftermarket? Aftermarket parts have been known to fail right out of the box.
     
  11. Aug 6, 2022 at 5:00 AM
    #11
    texasrho83

    texasrho83 Teacher in a Tundra

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    What are the variables that change when you speed up? Voltage...forced air volume....what else? I'd look into those areas of the AC system that change when those variables do...
     
  12. Aug 6, 2022 at 5:09 AM
    #12
    KNABORES

    KNABORES I wouldn’t say I’ve been missing it, Bob

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    Did they replace the condenser when they did the work? It’s the radiator looking thing in front of the engine coolant radiator. I would think it’s the most likely part of the system to sustain damage in the accident you described. It’s also air flow dependent. Another dumb question would be, did they reinstall the engine fan shroud, upper and lower? Without the shroud, airflow through the condenser and the radiator will be poor sitting still.
     
  13. Aug 11, 2022 at 12:05 PM
    #13
    OpieTaylor

    OpieTaylor New Member

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    On my tuck the A/C condenser is in front of the radiator so I can’t see how the radiator had to be replaced without having to replace the condenser.

    If they did replace the condenser then the whole system lost pressure and many errors could pop up.

    Are you sure about the click? I had a vehicle that wouldn’t cool without moving above 40mph because the electric fans went out and the condenser needed the airflow from those fans, it still got enough air that it wouldn’t overheat.

    Maybe the fan clutch or shroud is not proving enough airflow.
     

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