GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 7 of 7
  1. #1

    Default A properly running AC system question

    If an AC system has a new compressor, orifice, dryer and high pressure line, correct amount of refridgerant and the engine also has a new fan clutch, when turned on max, would it drain water? I have seen my other vehicles do that with the AC running and after the engine is shut down, but my 97 Tahoe, with all of the aforementioned items does not drain water and when it is put on max AC, it blows only cool. Does anyone know what may be the cause of an AC system described above only blowing cool and and not cold? Thanks.

  2. #2
    Legend
    stephan's Avatar
    Join Date
    Sep 2010
    Location
    Far West, Oregon USA,
    Posts
    8,606
    Blog Entries
    1

    Default

    Two possibilities on the lack of drain water. There may not be enough humidity in the air to condense, or the drain hose could be plugged.
    As for not blowing cold air providing it's properly charged, the blend door may not be closed or adjusted properly & is mixing heated air with the AC
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


  3. #3

    Default

    Yea the water is kind of a by product from the air, humidity levels will determine the amount of water.
    I'd check the drain lines, sooner or later you'll find that missing water and you might not like where it turns up which'll probably be on the passengers floor board of the truck.
    Again like Stephen posted check the blend door position this determines the temperature reaching the cabin.

  4. #4

    Default

    When using Max AC, you are recirculating the cabin air rather than drawing in fresh air from the outside. The perceived temp difference may simply be due to higher airflow across the evaporator. Try Max AC with the fan on low and see how cold it feels. As for no water dripping on Max, it won't take long to dry the air in the cabin, and the water will stop dripping. Once you go back to normal and draw in fresh air it should start dripping water again.
    When you hear hoofbeats, look for horses not zebras.

  5. #5

    Default

    Well, I live in Arizona, so zero humidity. Looks like I have to look at the blend door. Does that require dismantling the dash to access? Thanks for all of the replies.

  6. #6

    Default

    What kind of pressure reading are you getting on the manifold gauges, what is the ambient temp at the time of test, also did you check superheat?

  7. #7

    Default

    system was overcharged by .6 lbs of refridgerant. seems to working much better.

Similar Threads

  1. 98 Suburban Running Lights AND sound system issues
    By Eubyfied in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 7
    Last Post: 10-23-2010, 08:49 PM
  2. Factory plastic running boards question
    By troyb in forum Chevy Silverado Forum (GMC Sierra)
    Replies: 0
    Last Post: 04-26-2010, 08:10 PM
  3. 1999 suburban daytime running lights question
    By ochs99 in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 7
    Last Post: 04-15-2010, 06:44 PM
  4. Cooling system question
    By scott0303 in forum General Chevy & GM Tech Questions
    Replies: 5
    Last Post: 12-24-2009, 04:42 PM
  5. OE DVD System Question
    By DKramer1027 in forum Audio, Video & Gadget Tech
    Replies: 2
    Last Post: 05-12-2009, 09:39 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •