AC air vent block issue!!!

Discussion in 'Audio & Electronics' started by PlunkZ71, Jul 13, 2019.

  1. AzDiamondBlue

    AzDiamondBlue TYF Newbie

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    Hello. You seem to know bit about the Tech 2. Do you know off hand if it will go down to a 2004 Yukon, or is it just for newer ones? Thanks!
     
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  2. AzDiamondBlue

    AzDiamondBlue TYF Newbie

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    Found my answer! Thanks for the tip. Buying a Tech 2...might save me some headaches
     
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  3. PlunkZ71

    PlunkZ71 TYF Newbie

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    Well... went on a 12 hour trip to Colorado from Texas. evacuated the system, new orifice tube under the hood, sucked it down and filled to spec. the trip there was fine but on the way back into the texas heat, the symptoms started towards the last leg of the drive. I pulled in the driveway and popped the hood and the accumulator/drier was frozen solid. Im sure the evaporator is freezing as well causing the air not to flow through the vents. So whats the next step to figuring this issue out? Refrigerant temp sensor? Low pressure switch?

     
  4. kbuskill

    kbuskill ***CAUTION*** I do my own stunts!

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    Unfortunately GM cheaped out and didn't install a cabin air filter in the NNBS trucks.

    I would start by buying the cabin air filter retrofit kit which comes with the door and filter and I would cut the "door" open and use a good foaming coil cleaner and clean your evaporator coils really well before installing the new filter and door.

    Most of the time if an A/C is freezing up it is either a freon/pressure issue or a dirty evaporator coil not allowing enough air flow.

    My 2 bits... YMMV
     
  5. PlunkZ71

    PlunkZ71 TYF Newbie

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    Thanks for the tip but I actually just retrofitted a cabin air filter right before I left and evacuated the system and charged to spec. Evap looks new when i took this pic through the hole i cut for the filter. I rinsed the condenser off as well. I have noticed that the compressor clutch never seems to disengage when the ac is on.

    IMG_9820.JPG.jpeg
     
  6. kbuskill

    kbuskill ***CAUTION*** I do my own stunts!

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    Good to know that's not the issue... its possible that it could a pressure switch or temperature sensor...as mentioned before, a Tech2 would be very helpful in determining the culprit.
     
  7. PlunkZ71

    PlunkZ71 TYF Newbie

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    Thanks again. As much as I hate stealerships, I think i'm going to bite the the bullet and get the dealer to do a diagnostic check for $110. At least then ill have a leg to stand on and I can plan my attack.
     
  8. kbuskill

    kbuskill ***CAUTION*** I do my own stunts!

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    I hear you... just FYI... 3 stealership diagnostic fees would pay for a Tech2 clone and you could use it as much as you want/need.

    Just something to think about.
     
  9. PlunkZ71

    PlunkZ71 TYF Newbie

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    Can you recommend one to get or link me to a known good one? Ive been debating getting one. Ive heard that there is a seperate sd card for GM trucks in order to read ones like the Tahoe. Also, im sure the learning curve will slow the process down.
     
  10. kbuskill

    kbuskill ***CAUTION*** I do my own stunts!

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    @swathdiver
    @iamdub
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    One of these guys can surely point you in the right direction for the Tech2.
     

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