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1998 9400i A/C recharge

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Kenllah, Nov 19, 2017.

  1. Nov 19, 2017 #1
    Kenllah

    Kenllah Light Load Member

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    I had a broke AC line (freon leaked out) that I replaced. I would like to charge the system but the compressor won't engage. I checked power at the fuse and 2 relays (good). No power at the AC compressor. With direct power applied to compressor it kicks on but I'm afraid to damage a new compressor. Are there any tricks to this?
     
    Kenllah, Nov 19, 2017
    Kenllah, Nov 19, 2017
    #1
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  3. Nov 19, 2017 #2
    Heavyd

    Heavyd Road Train Member

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    hc_16.jpg
    See if you have one of these mounted on the firewall on the left hand side. Usually on the side of coolant reservoir. If you do, you have to reset it by keying on, and then off 4 times in 4 seconds.
     
    Heavyd, Nov 19, 2017
    Heavyd, Nov 19, 2017
    #2
    Oxbow Thanks this.
  4. Nov 19, 2017 #3
    Kenllah

    Kenllah Light Load Member

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    Didn't see one but I did try it. Clutch engages for a sort period (maybe 30 sec) then disengages after engine start.
     
    Kenllah, Nov 19, 2017
    Kenllah, Nov 19, 2017
    #3
  5. Nov 19, 2017 #4
    Old Man

    Old Man Road Train Member

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    Low pressure cut off switch is shutting off power to compressor
     
    Old Man, Nov 19, 2017
    Old Man, Nov 19, 2017
    #4
    Oxbow and AModelCat Thank this.
  7. Nov 19, 2017 #5
    Kenllah

    Kenllah Light Load Member

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    Ok. How do i get it to take freon if the low press switch shuts off power to the compressor
     
    Kenllah, Nov 19, 2017
    Kenllah, Nov 19, 2017
    #5
  8. Nov 19, 2017 #6
    Heavyd

    Heavyd Road Train Member

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    You really should be using a proper ac machine. It should be vacuumed down to remove all moisture and air and hold a vacuum for 10 mins or longer to make sure there are no further leaks. Then get it charged. Your truck should hold 4 pounds of 134a.
     
    Heavyd, Nov 19, 2017
    Heavyd, Nov 19, 2017
    #6
    Oxbow Thanks this.
  9. Nov 19, 2017 #7
    Kenllah

    Kenllah Light Load Member

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    Will go that route then. Thanks
     
    Kenllah, Nov 19, 2017
    Kenllah, Nov 19, 2017
    #7
  10. Nov 19, 2017 #8
    AModelCat

    AModelCat Road Train Member

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    As mentioned above, there are usually high and low switches on the A/C system. If the static pressure is too low in the system, the low pressure switch will be open and prevent the compressor from engaging.
     
    AModelCat, Nov 19, 2017
    AModelCat, Nov 19, 2017
    #8
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