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Pounds of refrigerant?

Discussion in '1936-Present Suburban' started by porboy, Aug 12, 2002.

  1. porboy

    porboy Registered Member

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    I am refilling my subs a.c. system(front and rear)with r134a and was wondering if any of you guys had a ruff estimate on how much 134a the system should hold. I already put about three and a half pounds in. The front is running ice cold but the rear is not. The refrigerant pressure only reads about 40 lbs. on my gauge. Any help would be appreciated.
     
  2. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    5.25lbs
     
  3. porboy

    porboy Registered Member

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    Thank you very much /forums/images/icons/smile.gif
     
  4. BXwildshot

    BXwildshot Registered Member

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    The expansion valve in the rear unit might be bad.
     
  5. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Fill 80-85% of the original r-12 when using r-134 as a replacement. 40 pounds on the low side sounds alright. Keep in mind that a warm engine compartment or ambient tempature will cause that number to rise. Winding it up will cause it to move too.
     

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