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1994 W900L AC Theromostat Switch

Discussion in 'Kenworth Forum' started by JimmyWells, May 26, 2017.

Page 5 of 6
  1. Jun 3, 2017 #41
    JimmyWells

    JimmyWells Road Train Member

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    Put a new compressor, clutch, thermo and trinary switches on today. Tested for leaks, vacuumed the system and charged up with 2lbs and 12ozs. No freezing, 40 at center vent (idling on recirculate), 38 or so while driving.

    I'm not sure if I have enough charge on it though but I'm apprehensive about putting too much in. Low side was slowly fluctuating between 25-30 and high side was around 225 on a sunny 80 degree day at 35% humidity. Should I risk adding more?
     
    JimmyWells, Jun 3, 2017
    JimmyWells, Jun 3, 2017
    #41
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  3. Jun 3, 2017 #42
    lilillill

    lilillill Sarcasm... it's not just for breakfast

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    I would leave it as is. The pressures look good and it's cooling good.
     
    lilillill, Jun 3, 2017
    lilillill, Jun 3, 2017
    #42
    JimmyWells Thanks this.
  4. Jun 3, 2017 #43
    JimmyWells

    JimmyWells Road Train Member

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    I'm leaning that way as well. Although, that pesky tinkering bug is nagging me.
     
    JimmyWells, Jun 3, 2017
    JimmyWells, Jun 3, 2017
    #43
  5. Jun 18, 2017 #44
    tnpete

    tnpete Medium Load Member

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    Have a question on these ac units? If part of the system was replaced. Then vacuumed out good. But never gassed up, would this mess up the system? Was told that was done 4 years ago. Guy did not use AC's, so he did not gas it up. But told me he did have a vacuum pulled on it when the parts were replaced.
    Reason parts were replaced. Driver wrecked and took out the Air to Air and ac parts along with the Hood and Radiator. So all that was replaced and never charged the system back up. If I buy the truck. Was thinking take my gauges and charge the system up. Sure hate to drive it home . 5+ hours with no AC. And being its getting into the 90's. This fat boy does not like hot air.
    Also on a 72" Studio sleeper truck. Would I be ok with thinking around 2.5 lbs would get it working? As not sure how much it takes on these W900l with 72" Sleeper. Also 1997 model truck. With the York compressor.
     
    tnpete, Jun 18, 2017
    tnpete, Jun 18, 2017
    #44
  7. Jun 18, 2017 #45
    lilillill

    lilillill Sarcasm... it's not just for breakfast

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    At a minimum, I would replace the drier, vacumn it down again and charge it if it shows to be leak free. (Holds a vacumn with no needle movement for 15 minutes)

    A drier will cost you $25-30 at most.
     
    lilillill, Jun 18, 2017
    lilillill, Jun 18, 2017
    #45
    JimmyWells and tnpete Thank this.
  8. Jun 18, 2017 #46
    JimmyWells

    JimmyWells Road Train Member

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    I would replace the dryer (and new oiled o rings), pull a vacuum and charge it. Even if it leaks a little at least you'll have A/C to get you to your destination.
     
    JimmyWells, Jun 18, 2017
    JimmyWells, Jun 18, 2017
    #46
  9. Jul 7, 2017 #47
    JimmyWells

    JimmyWells Road Train Member

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    Just wanted to update this to say the initial 2lbs and 12oz didn't work once the temps got into the 90's. I ended up putting a total of 5lbs 4oz (what the data plate called for) and now it's amazing in the cab. The A/C clutch stays running but I can hear the relay in the kick panel cutting in and out as the center vent alternates between 38 and 42 degrees.
     
    JimmyWells, Jul 7, 2017
    JimmyWells, Jul 7, 2017
    #47
  10. Jul 7, 2017 #48
    Superhauler

    Superhauler TEACHER OF MEN

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    Take front cover off out on the firewall. There will be a tray that sits on top of heat and evap core. The switch is mounted in the center of it with two wires going to it. Unplug wires and pull tray out being careful as to not damage the probe that is Jamed into the evap core. 5 lbs sounds like to much for that system. I run 3 1/2 lbs in all the W9s I have owned and never had a problem. If you have to much in the system the pressure will not let the pressure switches work correctly.
     
    Superhauler, Jul 7, 2017
    Superhauler, Jul 7, 2017
    #48
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  11. Jul 7, 2017 #49
    JimmyWells

    JimmyWells Road Train Member

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    No sir. As I previously mentioned, that's what the data plate calls for and it's functioning beautifully now. And I've already replaced the switch. It was definitely toasted. I've posted a picture in this thread earlier.
     
    JimmyWells, Jul 7, 2017
    JimmyWells, Jul 7, 2017
    #49
  12. Jul 7, 2017 #50
    Superhauler

    Superhauler TEACHER OF MEN

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    Sorry didn't pay attention to the date on the post. My bad.
     
    Superhauler, Jul 7, 2017
    Superhauler, Jul 7, 2017
    #50
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