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AC freeze probe problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by jeffman164, Aug 20, 2022.

Page 2 of 2
  1. Sep 6, 2022 #11
    jeffman164

    jeffman164 Medium Load Member

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    Not getting power to high or low pressure switches. Looked and don't have a APAD module. 1999 - 9200.
     
    jeffman164, Sep 6, 2022
    jeffman164, Sep 6, 2022
    #11
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  3. Sep 10, 2022 #12
    Heavyd

    Heavyd Road Train Member

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    Have you pulled the seat and heater box cover off and had a look at the wiring in there? At this point I would run a new wire from the relay down under the floor and to the heater box. Even if you have to run the wire out the front of the firewall and down underneath to the switches and then up to the freeze probe, that will work too.
     
    Heavyd, Sep 10, 2022
    Heavyd, Sep 10, 2022
    #12
    spsauerland Thanks this.
  4. Sep 11, 2022 #13
    jeffman164

    jeffman164 Medium Load Member

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    Yes, I have pulled the seat and cover and looked at the wires and they look good. New on/off switch and new freeze probe. The A.C. still works - just not sure if it is safe or that I might do damage. I am not getting power to the freeze probe or the high and low pressure switches. If I run a new wire from the relay, do I connect it to the top side of the freeze probe connection ?
     
    jeffman164, Sep 11, 2022
    jeffman164, Sep 11, 2022
    #13
  5. Sep 11, 2022 #14
    Heavyd

    Heavyd Road Train Member

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    From the ac control relay the power wire is 77H, light green wire that goes to a 6 wire connector that is probably located near the floor by the firewall area of the front corner of the cab before is goes under the floor. At this connector 77H becomes 77B and connects to 77C which goes to power the protection switches. So your new wire would connect to which ever terminal 77B is at. Polarity at the probe doesn't matter though.
    9000 ac.jpg
     
    Heavyd, Sep 11, 2022
    Heavyd, Sep 11, 2022
    #14
    BoxCarKidd and spsauerland Thank this.
  7. Sep 13, 2022 #15
    jeffman164

    jeffman164 Medium Load Member

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    Took a peak and lots of green wires going in all different directions. I feel that it is a little bit over my skill level. I do appreciate your help though. I will save this post for reference. Question : Since power is not getting to the high and low pressure switches - is it safe to use A.C. occasionally until I get it fixed in spring ? I would use the A.C. and occasionally turn it off for a little while so that it doesn't frost up
     
    jeffman164, Sep 13, 2022
    jeffman164, Sep 13, 2022
    #15
  8. Sep 17, 2022 #16
    Heavyd

    Heavyd Road Train Member

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    It really isn't "safe". The pressure switches are what kills power to the compressor if it gets too high or low. So you have no pressure protection. So you will run it at your own risk.
     
    Heavyd, Sep 17, 2022
    Heavyd, Sep 17, 2022
    #16
  9. Sep 17, 2022 #17
    jeffman164

    jeffman164 Medium Load Member

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    Ok. I will have the A.C. looked at. Thank you for all of your help.
     
    jeffman164, Sep 17, 2022
    jeffman164, Sep 17, 2022
    #17
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