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  1. #1
    LordNelson's Avatar
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    Pressure Switch Location?????

    Can anyone help my locate the Air-con pressure switch on my S3 8L (2000).

    I might be being stupid but cant locate it.
    I need to test the switch before i go and buy a new one.

    thanks

    2000 Audi S3
    1967 VW Beetle
    Location: Wakefield
    Where Do I go From Here?

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  3. #2
    Staz's Avatar
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    You may have more luck in the 8L forum mate.
    8P2 S3

    For advice on Air Con problems please read my FAQs.
    To find ASN members with VCDS check out the MAP.

  4. #3
    mike-turbo's Avatar
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    its behind the heat sheild at the back of the turbo

  5. #4
    technics100's Avatar
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    On the A4's the pressure switch is located on the air-con radiator near the pass side headlight, its just a unscrew and change job..


    2003 Silver A2 1.4 TDi - 65mpg & 30 a year to tax - ;-)
    2003 Atlas Grey A4 2.0 S-line - gone
    2000 Goodwood Green S6 4.2 V8 - gone

  6. #5
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    Does the system need the gas removing first? My A4 has a blown fuse 6 (air con pressure switch) and blows a new fuse as soon as the ignition is swiched on. I'm thinking that if the wiring is ok (will test for a dead short at the plug when I find the damn switch) then the pressure switch must have died and gone dead short.

  7. #6
    Staz's Avatar
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    Yes mate if you want to change the pressure switch the whole system needs to be recovered
    8P2 S3

    For advice on Air Con problems please read my FAQs.
    To find ASN members with VCDS check out the MAP.

  8. #7
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    How the hell can you get to the sensor? Please tell me you don't have to remove the front bumper!!
    2005 Audi A4 Avant 1.9TDi

  9. #8
    Staz's Avatar
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    You may have more luck asking in the A4 forum mate.
    8P2 S3

    For advice on Air Con problems please read my FAQs.
    To find ASN members with VCDS check out the MAP.

  10. #9
    technics100's Avatar
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    Quote Originally Posted by Wobbler View Post
    Does the system need the gas removing first? My A4 has a blown fuse 6 (air con pressure switch) and blows a new fuse as soon as the ignition is swiched on. I'm thinking that if the wiring is ok (will test for a dead short at the plug when I find the damn switch) then the pressure switch must have died and gone dead short.
    No it doesn't (B6 A4) it just unscrews and unplugs..


    2003 Silver A2 1.4 TDi - 65mpg & 30 a year to tax - ;-)
    2003 Atlas Grey A4 2.0 S-line - gone
    2000 Goodwood Green S6 4.2 V8 - gone

  11. #10
    NHN
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    Quote Originally Posted by mike-turbo View Post
    its behind the heat sheild at the back of the turbo
    Yeah this is where it is I believe, as thats what I had to change on my late 99 S3 once, I lost cold air, so changed this which was 50 & it worked again, its slightly more to the right IIRC from the turbo, but is hidden behind the heat shielding in that area attached to the silver pipes & as already said, they emptied system then regassed to do the job.

    OEM RETROFITS - CRUISE CONTROL - SAT NAV - BLUETOOTH - AMI - HEADLIGHT SYSTEMS

    PARKING SYSTEMS - DIAGNOSTICS - FAULT FINDING - BODYWORK - PAINTWORK

  12. #11
    Staz's Avatar
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    Quote Originally Posted by technics100 View Post
    No it doesn't (B6 A4) it just unscrews and unplugs..
    Ok if you do it that way you'll vent all the refrigerant!
    8P2 S3

    For advice on Air Con problems please read my FAQs.
    To find ASN members with VCDS check out the MAP.

  13. #12
    NHN
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    I would have to agree, given the name of the actual switch it would suggest its not a good idea to undo it without removing the pressure it reads, given its refridgerant that wouldnt be wise huh Staz.

    OEM RETROFITS - CRUISE CONTROL - SAT NAV - BLUETOOTH - AMI - HEADLIGHT SYSTEMS

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  14. #13
    Staz's Avatar
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    ...and illegal!

    Plus it would allow air into the system if it was done that way so it'd have to be deep vacuumed before recharging.
    8P2 S3

    For advice on Air Con problems please read my FAQs.
    To find ASN members with VCDS check out the MAP.

  15. #14
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    I have read that the switch screws into a valve assembly similar to a tyre valve, although this would mean some gas would escape as the valve was removed/fitted.

    Think I'll get the garage to do it for me.
    2005 Audi A4 Avant 1.9TDi

  16. #15
    NHN
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    Advisable mate, given the system involved & yes, iirc, it just screws onto the pipe as such.

    OEM RETROFITS - CRUISE CONTROL - SAT NAV - BLUETOOTH - AMI - HEADLIGHT SYSTEMS

    PARKING SYSTEMS - DIAGNOSTICS - FAULT FINDING - BODYWORK - PAINTWORK

  17. #16
    Staz's Avatar
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    Yeah and as the refrigerant escapes it super cools and will give you frostbite.
    8P2 S3

    For advice on Air Con problems please read my FAQs.
    To find ASN members with VCDS check out the MAP.

  18. #17
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    Sooo. gloves would be advisable then?.......just kidding, given that the bumper has to come off and that I have no inclination to undertake a job I'm unsure of, I'm gonna book it into the dealers.
    2005 Audi A4 Avant 1.9TDi

  19. #18
    NHN
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    Why take it to a dealer mate, take it to any garage that has an ac gasser, they can remove the bumper & re-gas for a hell of alot cheaper than audi for sure.

    OEM RETROFITS - CRUISE CONTROL - SAT NAV - BLUETOOTH - AMI - HEADLIGHT SYSTEMS

    PARKING SYSTEMS - DIAGNOSTICS - FAULT FINDING - BODYWORK - PAINTWORK

  20. #19
    technics100's Avatar
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    Changing the G65 pressure switch does not vent the system. I have changed the sensor, it just unscrews and the new one screws in.


    2003 Silver A2 1.4 TDi - 65mpg & 30 a year to tax - ;-)
    2003 Atlas Grey A4 2.0 S-line - gone
    2000 Goodwood Green S6 4.2 V8 - gone

  21. #20
    Staz's Avatar
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    Quote Originally Posted by technics100 View Post
    Changing the G65 pressure switch does not vent the system. I have changed the sensor, it just unscrews and the new one screws in.
    How does it keep the refrigerant in then?
    8P2 S3

    For advice on Air Con problems please read my FAQs.
    To find ASN members with VCDS check out the MAP.

 

 

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