Question about 1983 Chevrolet Chevy

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1995 Chevy pickup. The high pressure A/C valve is stuck open. How do I repair or replace. Used a long schrader valve tool but can't get it to grab. It just turns?

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  • foneman99 Sep 09, 2009

    Thanks for the info

  • Richard Scordino May 11, 2010

    never had that happen but try a long skinny pair of tweezers and try to pull up as you turn it.

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  • Master
  • 986 Answers

I know you dont want to hear this ,but you are more than likey have to change that line,

Posted on Sep 09, 2009

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How to bleed the fuel line on a 2012 Chevy impala


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The A/C high side valve is leaking on my 1994 Chevy Silverado 1500. It's an R134a system. Can the valve be replaced


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REPLACEING FUEL FILTER


Pressure Relief
Special Tool(s) EFI/CFI Fuel Pressure Gauge
310-012 (T80L-9974-B) swn~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel related component. Highly flammable mixtures are always present and may be ignited, resulting in possible personal injury.
swn~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Fuel in the fuel system remains under high pressure even when the engine is not running. Before servicing or disconnecting any of the fuel lines or fuel system components, the fuel system pressure must be relieved to prevent accidental spraying of fuel, causing personal injury or a fire hazard.
  1. Remove the schrader valve cap and attach the EFI/CFI Fuel Pressure Gauge.
  2. e5e3ebf.gif
    NOTE: Open the manual valve slowly to relieve the system pressure. This may drain fuel from the system. Place fuel in a suitable container.
    Open the manual valve on the EFI/CFI Fuel Pressure Gauge slowly and relieve the fuel pressure. 9deacdd.gif
    Filter Removal
    1. Relieve the fuel pressure; refer to Above.
    1. Remove the fuel filter (9155).
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      1. Remove the fuel filter from the fuel filter support.
      2. b717c63.gif
      1. Push Connect Fittings
        Special Tool(s) Fuel Line Disconnect Tool
        310-S039 (T90T-9550-S) 4bbcf9e.gif
        1. Relieve the fuel pressure; refer to Pressure Relief in this section.
        1. Disconnect the safety clip from the male hose.
        2. Install the fuel line disconnect tool and push into the fitting. f0af03c.gif
          Install the fuel line disconnect tool and push into the fitting. 367328f.gifSeparate the fittings.
          • Inspect for damage.
          • Clean the fittings.
          • 3beef33.gif

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Where is the Schrader valve on a ford Explorer 1995 V6


I believe the schrader valve for checking your fuel pressure can be seen looking from the passenger side of the engine. It is on the fuel rail, which is installed between your lower and upper intake manifold sections, about the center of the fuel rail.

Hope helps (remember rated this) Good luck.

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The pressure check valve on your EVAP canister is stuck open or damaged. Replace the canister

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its possible but if you install a good service cap with known good o-ring inside...this might take care of it...for your info ,that cap is the primary seal of the port and open schraders can leak on a good day ...in order to replace that schrader ...a/c must be discharged..evacuated and recharged after replacement...put a good cap on it and save the big fix

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1 Answer

Hot air comes out at all times even when i turn on a/c


I think your cooling fan (elecric) isn't working when the a/c is on. If so, The a/c pressure climbs very high and pops open the emergency pressure release to save the system from damage.

Check your cooling fan and relays, or ect, engine collant temp sensor.

You may have to add freon too.

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A/C Pressure Cutoff Switch

The A/C pressure cutoff switch is used to interrupt A/C compressor operation in the event of high system discharge pressures.
  • The A/C pressure cutoff switch is mounted on a Schrader valve-type fitting on the A/C compressor to condenser discharge line.
  • It is not necessary to discharge the refrigerant system to remove the A/C pressure cutoff switch.
  • A valve depressor, located inside the threaded end of the A/C pressure cutoff switch, presses on the Schrader valve stem.
  • This allows the A/C pressure cutoff switch to monitor the compressor discharge pressure.
  • When the compressor discharge pressure rises, the switch contacts open, disengaging the A/C compressor. When the pressure drops, the contacts close to allow operation of the A/C compressor. For specifications regarding operating pressure(s), refer to Section 412-00 .
The switch contains a second set of electrical contacts used for high-speed cooling fan control.
  • When the compressor discharge pressure rises, the contacts close and engage the high-speed fan control. When the pressure drops, the contacts open and the high speed fan control is disengaged. For additional information, refer to Section 303-03 .

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