Please make it make sense

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 85COE, Dec 9, 2022.

  1. 85COE

    85COE Light Load Member

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    85 Volvo COE

    New pump
    Lines are clear - tested with air from compressor. Air blows through
    Reservoir is full

    Will not spray fluid onto windshield

    3 shops are stumped
     
    austinmike and RubyEagle Thank this.
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  3. Star Rider

    Star Rider Medium Load Member

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    Is polarity reversed on the pump and running it backwards?
     
  4. 85COE

    85COE Light Load Member

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    Air lines are connected properly
     
    Oxbow Thanks this.
  5. Star Rider

    Star Rider Medium Load Member

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    The electric going to the washer pump. If the wires are hooked backwards the pump will run in reverse and flow the opposite the way it should.
     
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  6. 85COE

    85COE Light Load Member

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    I failed to.mention it is air-powered

    Old school truck
     
    Oxbow Thanks this.
  7. Star Rider

    Star Rider Medium Load Member

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    I think it would be easier and cheaper to just wire in an electric pump.
     
    jsnell, ducnut and Oxbow Thank this.
  8. RubyEagle

    RubyEagle Medium Load Member

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  9. 85COE

    85COE Light Load Member

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    You would be incorrect

    Brand new, and tested
     
  10. Oxbow

    Oxbow Road Train Member

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    Only thing that comes co my mind is vent in reservoir plugged, but you should see something prior to vacuum lock.
     
    singlescrewshaker Thanks this.
  11. singlescrewshaker

    singlescrewshaker Road Train Member

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    You got a new Sprauge control valve in the dash?

    I had one go bad where when I depressed it to spray fluid, air come out the weep hole in the bottom, instead of the line going to the reservoir.. Wipers still worked though..
     
    Flint1 Thanks this.
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