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A/c pressure switch on 2004 volvo 670

Discussion in 'Volvo Forum' started by jlawall, Jun 19, 2014.

  1. Jun 19, 2014 #1
    jlawall

    jlawall Light Load Member

    63
    15
    Jan 29, 2011
    wapwallopen pa
    0
    Can anyone tell me just what functions the three wire pressure switch on the a/c system controls on my 2004 670. The switch is in the pressure line after the receiver dryer. The fan cycles in at a normal pressure of around 325 but the clutch cycles in and out app. every 12 seconds.
     
    jlawall, Jun 19, 2014
    jlawall, Jun 19, 2014
    #1
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  3. Jun 30, 2014 #2
    Aleeex

    Aleeex Light Load Member

    150
    78
    Jun 8, 2014
    Sacramento
    0
    Ground, positive, and signal.
     
    Aleeex, Jun 30, 2014
    Aleeex, Jun 30, 2014
    #2
    jlawall Thanks this.
  4. Jul 1, 2014 #3
    jlawall

    jlawall Light Load Member

    63
    15
    Jan 29, 2011
    wapwallopen pa
    0
    Ok. So does it return a signal when the pressure is within a specific range, as not to high and not to low, or is it just monitoring pressure for to high?
     
    jlawall, Jul 1, 2014
    jlawall, Jul 1, 2014
    #3
  5. Jul 1, 2014 #4
    Aleeex

    Aleeex Light Load Member

    150
    78
    Jun 8, 2014
    Sacramento
    0
    I'm not 100% positive, but I think the voltage range is 0-5v.


    Run the truck with ac and throw a simple voltage meter on there and take a reading on the signal wire. Maybe you're getting erratic signals..
     
    Aleeex, Jul 1, 2014
    Aleeex, Jul 1, 2014
    #4
  7. Jul 1, 2014 #5
    Aleeex

    Aleeex Light Load Member

    150
    78
    Jun 8, 2014
    Sacramento
    0
    I had a broken wire between the sensor and the plug on the HVAC box. My ac was not working at all.

    If you need to check continuity in the wiring harness.. You need to pull the passenger dash piece.. And check between the sensor and that big plug with colored wires.

    There's only one plug.
     
    Aleeex, Jul 1, 2014
    Aleeex, Jul 1, 2014
    #5
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