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MXS Acert High Water Temp-Fan Not Engaging

Discussion in 'Trucks [ Eighteen Wheelers ]' started by oneshot, Aug 31, 2013.

  1. Aug 31, 2013 #1
    oneshot

    oneshot Medium Load Member

    626
    248
    Feb 28, 2009
    mississippi
    0
    I noticed this week that if I dont have the A/C on and not moving,when the water temp climbs the fan does'nt come on. When i unplugged the sensor at the water pump it goes into a default and fan stays on. My question is,which sensor tells the fan to come on when the water temp reaches 217? The sensor on the waterpump or the small sensor at the front top of the head that has a small stud coming out that a single wire pushes onto that stud? Thx in advance. Also when the A/C is on the fan cycles like it should.So I know it's water sensor related just not sure which sensor.
     
    oneshot, Aug 31, 2013
    oneshot, Aug 31, 2013
    #1
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  3. Aug 31, 2013 #2
    ingedavi

    ingedavi Light Load Member

    53
    18
    Jan 1, 2008
    Eau Claire, WI
    0
    Are you sure that the temperature reading in the ECM is the same as your gauge? My Peterbilt gauge is 15 degrees different than what the ECM reads.
     
    ingedavi, Aug 31, 2013
    ingedavi, Aug 31, 2013
    #2
  4. Aug 31, 2013 #3
    oneshot

    oneshot Medium Load Member

    626
    248
    Feb 28, 2009
    mississippi
    0
    Well the gauge reads about 225 when the high water light comes on,but no fan.I'm unsure which sensor tells the ecm the water temp for the fan to respond.
     
    oneshot, Aug 31, 2013
    oneshot, Aug 31, 2013
    #3
  5. Aug 31, 2013 #4
    EverLuc

    EverLuc Light Load Member

    295
    101
    Feb 18, 2013
    0
    Mine never really ever came on either and I've had the truck since brand new. I have just always flipped the switch on @ around 190...going up a grade...in the summer. I was told the Acert operates normally @ 200 degrees. I never could get used to this so I swapped out the thermostats with a pair of Pittsburgh Power tstats. 150-180 degrees all day long. That was back in 05. Never had a problem.
     
    EverLuc, Aug 31, 2013
    EverLuc, Aug 31, 2013
    #4
    oneshot Thanks this.
  7. Aug 31, 2013 #5
    oneshot

    oneshot Medium Load Member

    626
    248
    Feb 28, 2009
    mississippi
    0
    I'm not really having an overheating problem. I'm having a fan not being told to come on problem. It comes on with manual switch and cycles with A/C.
     
    oneshot, Aug 31, 2013
    oneshot, Aug 31, 2013
    #5
  8. Aug 31, 2013 #6
    black ultra

    black ultra Light Load Member

    62
    13
    Feb 16, 2012
    conroe tx
    0
    You most likely need a new temp. sensor! It's kind of a pain to get to. It is on the right front of the thermostat housing,and you have to come in from the fan side with a socket & ratchet!!
     
    black ultra, Aug 31, 2013
    black ultra, Aug 31, 2013
    #6
    oneshot Thanks this.
  9. Aug 31, 2013 #7
    oneshot

    oneshot Medium Load Member

    626
    248
    Feb 28, 2009
    mississippi
    0
    That's what I'm thinking. Just wanted to make sure it wasn't the easy one to get to up top that gave the ecm the engine temp for the fan.
     
    oneshot, Aug 31, 2013
    oneshot, Aug 31, 2013
    #7
  10. Sep 1, 2013 #8
    Oscar the KW

    Oscar the KW Going Tarpless

    12,247
    28,119
    May 19, 2011
    0
    The one on top is for the dummy light, on my BXS a few years ago the light and buzzer came on, the gauge read normal, changed that one and the light and buzzer went off.
     
    Oscar the KW, Sep 1, 2013
    Oscar the KW, Sep 1, 2013
    #8
    oneshot Thanks this.
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