High Side Service Port.
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Cadillac Seville / Cadillac Eldorado Forum Discussion, High Side Service Port. in Past Cadillac Vehicle Discussion; I have a 1996 Cadillac Seville STS. I think my high side service port valve is leaking, I think it's ...
  1. #1
    dv53 is offline Cadillac Owners Member
    Automobile(s): 1996 STS
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    High Side Service Port.

    I have a 1996 Cadillac Seville STS. I think my high side service port valve is leaking, I think it's the valve because there's residue inside the cap and the silver liquid line below it is all gummed up. There doesn't seem to be anything coming from the port where it threads onto the line. I have a tool to take out the valve, but it only works for the low side port valve. Is there a different one for the high side? I'd rather just replace the valve if I can get it out. If I need to buy a special tool; I can just buy the whole port as they are cheap, Thanks!

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    sefiro's Avatar
    sefiro is online now Cadillac Owners Enthusiast
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    Re: High Side Service Port.

    These are the tools used to change the Schrader valve on r134 systems. The high and low side are different sizes so two different tools. (I don't remember if the valves themselves are different).

    Ps. These are used on systems that are still pressurized. Be sure to loosen the Schrader valve before trying to use the tool.


  4. #3
    dv53 is offline Cadillac Owners Member
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    Thread Starter

    Re: High Side Service Port.

    Thanks!

  5. #4
    Harry Yarnell is offline Cadillac Owners Connoisseur
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    Re: High Side Service Port.

    You might try some soapy water on the valve to check for leaks.

  6. #5
    dv53 is offline Cadillac Owners Member
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    Thread Starter

    Re: High Side Service Port.

    I found the leak on the high pressure port. It looks like the Schroeder valve is leaking, but the valve looks like it has a piece of clear plastic surrounding it. it doesn't look like a tool will fit over the sch valve to screw it out. Only the tip is exposed. I could replace to whole valve assembly on the line, but would have to draw the system down somewhere. I was gonna buy one of those tools that closes off the refrigerant while the valve is being replaced, but I want to make sure the valve can be taken out first. Have you ever seen that before, meaning, something looking like it covers a Schroeder Valve?

  7. #6
    sefiro's Avatar
    sefiro is online now Cadillac Owners Enthusiast
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    Re: High Side Service Port.

    Use basic Schrader valve tool to loosen and ensure that the expensive valve tool can get to it. Some of expensive tools are made of softer metal and break when trying to free the Schrader valve

  8. #7
    dv53 is offline Cadillac Owners Member
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    Re: High Side Service Port.

    Thanks. Have a look at the attached picture. Only the tip of the Schroeder valve is exposed as to not allow a tool to get over it.


    ac high side valve.jpeg

  9. #8
    sefiro's Avatar
    sefiro is online now Cadillac Owners Enthusiast
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    Re: High Side Service Port.

    That's a gm oem bell valve that is prone to leaking. You will have to replace the pipe with a new valve. Be sure to get an after market pipe so as to get one with a shrader valve for future maintenance.

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