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A/C high pressure switch

Discussion in 'Trucks [ Eighteen Wheelers ]' started by silver dollar, Aug 29, 2014.

  1. Aug 29, 2014 #1
    silver dollar

    silver dollar Medium Load Member

    481
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    Jan 31, 2009
    Central North Carolina
    0
    I have a couple of questions about replacing the A/C high pressure switch.

    1) to replace it will the system have to be evacuated?
    2) do I need to use Thread sealer, such as Teflon on the threads of the switch?
     
    silver dollar, Aug 29, 2014
    silver dollar, Aug 29, 2014
    #1
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  3. Aug 29, 2014 #2
    JohnP3

    JohnP3 Road Train Member

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    Feb 21, 2010
    Rock Creek B.C. Canada
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    The port has a Schrader valve so there is no system leakage just what is in the switch. You just unscrew the switch.
    you do not use a sealer, you do want to put a little Pag or ester oil on the "O" ring when you screw on the new switch.
    Just a thought
     
    JohnP3, Aug 29, 2014
    JohnP3, Aug 29, 2014
    #2
    HopeOverMope, Raiderfanatic and silver dollar Thank this.
  4. Aug 29, 2014 #3
    snowwy

    snowwy Road Train Member

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    Jul 6, 2009
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    the appropriate oil on the o ring that goes inside the screw in portion of the switch. and screw her on. ez pz.

    make sure to check the schrader valve though. if you see any oil inside there when you unscrew the old switch. means that valve is leaking. then your going to have to evacuate, replace the valve. evacuate system into a vacuum state. (recommended for best results). and recharge with fresh freon.

    or r134a refridgerant if your one of them nit picky people who wants the exact terminology.
     
    snowwy, Aug 29, 2014
    snowwy, Aug 29, 2014
    #3
    silver dollar Thanks this.
  5. Aug 29, 2014 #4
    silver dollar

    silver dollar Medium Load Member

    481
    210
    Jan 31, 2009
    Central North Carolina
    0
    Thanks for the help guys. I got it changed ok. My engine fan was running constantly. Now I'm good to go. Thanks again.
     
    silver dollar, Aug 29, 2014
    silver dollar, Aug 29, 2014
    #4
  7. Aug 29, 2014 #5
    Davidlee

    Davidlee Medium Load Member

    419
    156
    Aug 31, 2012
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    there's a tool for replacing valve core without evacuation of the system. Takes 30 seconds to replace.
     
    Davidlee, Aug 29, 2014
    Davidlee, Aug 29, 2014
    #5
  8. Aug 30, 2014 #6
    lastgoodusername

    lastgoodusername Medium Load Member

    444
    215
    Dec 18, 2008
    central NC
    0
    more info please
     
    lastgoodusername, Aug 30, 2014
    lastgoodusername, Aug 30, 2014
    #6
  9. Aug 30, 2014 #7
    Davidlee

    Davidlee Medium Load Member

    419
    156
    Aug 31, 2012
    0

    Mastercool (MAS58490) Universal A/C Valve Core Remover & Installer Ki
    $124.00 from ToolTopia.com1,198 seller reviews
    These tools allow the user to service valve cores without losing the systems charge. This remover/installer kit makes removal or insertion much ...
     
    Davidlee, Aug 30, 2014
    Davidlee, Aug 30, 2014
    #7
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