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95 3406E Cat Running Hot

Discussion in 'Peterbilt Forum' started by Cisco Kid, May 23, 2017.

  1. May 23, 2017 #1
    Cisco Kid

    Cisco Kid Bobtail Member

    22
    8
    Mar 2, 2017
    Houston, Tx.
    0
    About 4 months ago, my clutch fan went out and the computer shut my truck down at a tad north of 200*. About 2 gallons of antifreeze boiled out. I replaced with water and moved on. (I bolted the clutch fan together so I could continue.) Well ever since then, my truck seems to run hot. Meaning the temperature clims to about 190 then the clutch fan kicks in and cools back to 180. Now, prior to my truck over heating, it used to run about 160 empty, and a littler hotter loaded. But never would it climb to 190 or 200 unless its full blown summer and I was climbing a hill. Some say it might be my thermostat? Too much water in the radiator? Or the radiator is clogged? What do you guys think?
     
    Cisco Kid, May 23, 2017
    Cisco Kid, May 23, 2017
    #1
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  3. May 23, 2017 #2
    swaan

    swaan Road Train Member

    2,942
    4,374
    Jul 12, 2009
    BC canada
    0
    Coolant dont boil at 200. Also your ecm will not shut you dont at 200 either.

    Im starting to think your temp guage is not very accurate.

    Your truck should cruise at 185-192 .

    160 is not normal.

    I would start with new thermostats and a new quality temp quage and go from there.
     
    swaan, May 23, 2017
    swaan, May 23, 2017
    #2
    TGUNKEL and Roberts450 Thank this.
  4. May 23, 2017 #3
    Call_Me_The_Breeze

    Call_Me_The_Breeze Medium Load Member

    504
    441
    Dec 30, 2015
    0
    Some other things to consider. A lot of newish trucks (not sure if a '95 would, but GM began using Dex-Cool in 1995, basically the same thing, and it quickly became called Death-Cool) use ELC with OAT. In layman's terms, it's extended life coolant with a different composition than standard ethylene gylcol. If properly maintained, it's supposed to last much longer than standard green. It's actually a better coolant, but it's higher maintenance.

    AAAANNNND.... it doesn't take much air in the system to create chaos. The coolant turns to acidic sludge and begins to eat away at anything it touches, including gaskets. Also, unlike standard green, if too much straight water is added, it can dilute the coolant to where it no longer does its job properly. Also, air in the system can collect in a particular spot, which could cause the temp sensor to read incorrectly if it is surrounded by air instead of coolant.

    Here's an article on the subject... And the how's and why's of it...

    Is Your Extended Life Coolant Contaminated or Diluted?
     
    Last edited: May 24, 2017
    Call_Me_The_Breeze, May 23, 2017
    Call_Me_The_Breeze, May 23, 2017
    #3
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