C7 cat- operating temp question

Discussion in 'Trucks [ Eighteen Wheelers ]' started by willeo6709, Apr 30, 2016.

  1. willeo6709

    willeo6709 Bobtail Member

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    Oct 26, 2015
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    I have a new to me C7 Cat in a Pete 335 box truck. It runs good and drives good but one thing kinda bugging me - The temp runs 150-175 degrees ( I got it to 175 on the warmest day so far, about 80, uphill full load with the ac on ), usually 150-160 in the mild cooler weather I owa has been having the last couple weeks.

    I am used to 180-200 normal temps..... do I have something screwy going on or is this a CAT thing?
     
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  3. swaan

    swaan Road Train Member

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    Jul 12, 2009
    BC canada
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    You just need new thermostats.
    It should be running 185-190
     
  4. GrapeApe

    GrapeApe Road Train Member

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    Jan 7, 2013
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    180-200 is normal temp range for them. You need to verify that the gauge it accurate, I usually use a temp gun on the T-stat housing to verify that it matches the gauge and the ECM temp in Cat ET. If the engine is really running too cool, most likely the thermostat is not sealing or hanging open slightly.
     
  5. ClineER

    ClineER Light Load Member

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    Apr 27, 2016
    N.E. Oklahoma
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    Check your gauge for accuracy. I have 99 with cat 3126 and reads same about 175. Gauge is about 10 degrees off from ecm temp always reads a little colder
     
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