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More A/C issues- fixed the plastic piece- now what?

Discussion in 'The Garage' started by SC-Texas, Nov 1, 2006.

  1. SC-Texas

    SC-Texas Registered Member

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    My A/C wasn't blowing hard. so I asked for advice & received some.

    I had my mechanic remove the vent assembly from under the dash and the plastic piece that opened and closed some of the duct work was broken.

    Now that it has been replaced and everything reassembled, the A/C blows even weaker and the diverter doesn't seem to be opening or closing.

    anyone have some more ideas?
     
  2. Cmoe

    Cmoe 1/2 ton status

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    are you feeling air out of your lower vents or defrost vents when you have the AC on, if you do you may have a vacume leak......
     
  3. SC-Texas

    SC-Texas Registered Member

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    OK, that is one thing the mechanic said- it may be a bad vacuum bulb.
     
  4. kwissman

    kwissman 1/2 ton status

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    Where did he get the plastic piece on the door. Mine is also bad and I need to replace it.
     
  5. SC-Texas

    SC-Texas Registered Member

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    I ordered a set from LMT
     
  6. RAY

    RAY 1/2 ton status Premium Member

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    Are you sure its not the blower motor? My A/C back when it worked:mad: wasn't blowing hard because the motor was worn out. Picked up a new one at autozone for $20 and it worked well until the compressor froze.
    Just an idea.
    Ray
     
  7. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    If you get a new fan, order one for a 94 Chevy 1/2 ton extended cab -- They move a ton more air than your factory one does, and is a direct bolt in swap.

    And as mentioned, sounds like either your vaccum bulb is bad, a line is shot / pinched, or your valves may be bound up.
     
  8. SC-Texas

    SC-Texas Registered Member

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    The fan works. That was replaced last year.

    I may pick up a 94 fan though if it will move more air.
     
  9. SC-Texas

    SC-Texas Registered Member

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    WeThe Blazer's dash is apart, once again, and my mechanic thinks its the vacuum bulb.
     
  10. SLOK5

    SLOK5 1/2 ton status

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    Theres not a lot of thinking to be done...It either holds vacuum or not.....:rolleyes: . I would be sure everything is moving freely and the doors are not binding. If the vacuum pods hold vacuum then it may be a lack of vacuum to them. Check and replace vacuum hoses to the intake manifold and tee connections. Test Vacuum at pods and see how much is there when engine running. It should be a pretty straight forward diag.
     
  11. SC-Texas

    SC-Texas Registered Member

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    The vacuum pod holds vacuum on the bench, but the bench tester is said to be pulling much more vacuum than teh truck system does.
     
  12. SC-Texas

    SC-Texas Registered Member

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    Thanks to everyone for their help and suggestions.

    After the plastic peice was replaced, the system didn't open or close the baffle doors properly.

    After a few weeks of intermittent work and inspection, along with a a schematic thoughtfully provided by a board member, my mechainc determined that someone, many,m many years ago, put the vacuum motor in backwards.

    Of course, now that the A/C works properly, and the temp has dropped t0 32f, the heater is ont working!
     
  13. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    That's some funny sh1t.... :haha: Not for you, I'm sure....but that reminds me a lot about how a lot of my repairs seem to go.


    :usaflag:


    ps. Looks like your fingers are too cold to even type!!!
     
  14. SC-Texas

    SC-Texas Registered Member

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    I'm taking back to the mechanic this afternoon, He is a great guy and undercharged me for the time he put into this project.
     
  15. SC-Texas

    SC-Texas Registered Member

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    Y'all just have to love this one . . the water pump isn't pumping water.

    This explains the occasional times when I am in traffic and the temp spikes up to 280f.

    Double damn! But the A/C blows out of hte correct vents now!
     
  16. randy88k5

    randy88k5 1/2 ton status

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    I got mine from the dealer...

    GM Part # 03018715
     
  17. SC-Texas

    SC-Texas Registered Member

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    I just wanted to say thanks to everyone who helped me with this project.

    The A/C & the heater now blow through the correct vents.

    The vent system ended up with two issues:
    1. The broken plastic piece.
    2. A vacuum switch that had been mounted upside down.

    The heater didn't work because the heater hose was run off a fitting on the waterpump instead of the intake.

    Now its of to the upholstery shop for new seat covers.
     

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