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question about a/c fill and drain

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by scrappyk5, Aug 12, 2003.

  1. scrappyk5

    scrappyk5 1/2 ton status

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    Location:
    virginia
    i tried to charge my system but it would only take a
    little , and the compressor will only kick on for about
    10 seconds at a time. someone told my i was overcharged
    and to drian a little out. as soon as i did this, the
    compressor stop kicking in all together. i still have
    lots of pressure in both the top valve and the bottom valve.
    the bottom valve spits out some type of stuff when i try to drain it.
    my question is , should i completely drain the whole system
    and start over ? and if so , what ways can i drain the whole system ?
    and last , if i drain the whole system , do i just recharge it in the top valve ( valve coming out of the round canistor)?

    thanks for any help
     
  2. BRN78BLAZER

    BRN78BLAZER 1/2 ton status

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    Location:
    Stoney Creek Ontario, Canada
    You have to pull vacumm in order to empty the system, you can't just drain it out of one of the valves. Also you were undercharged, then emptying it brought the charge too low for the compressor to kick on at all. Pull vacumm then charge it from the low side (top) valve and it should be much better.
     
  3. scrappyk5

    scrappyk5 1/2 ton status

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    cool , thanks alot. i guess i have to take it somewhere to get them to vacuum. then i might as well have them recharge it.

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