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themostat question

Discussion in 'Quitters' Club' started by FinoCJ, Mar 21, 2015.

  1. Mar 21, 2015
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
    Joined:
    Jul 18, 2013
    Messages:
    5,622
    Working with a friend on his 2004 TJ with the 4.0 6cyl. Doing some maintenance including replacing coolant, hoses etc. Have a question about the thermostat: We have heard some suggestions (or maybe internet forum mis-information) that we should drill a hole in outer flat flange in our new replacement Stant thermostat (which currently does not have one). Have not removed the current (and original we think) thermostat to see whether it has a hole or not. Wondering if we really need to do this or what is the idea behind doing it.

    thanks all
     
    FinoCJ, Mar 21, 2015
    #1
  2. Mar 25, 2015
    DrDanteIII

    DrDanteIII Master Procrastinator

    Milford NJ 08848
    Joined:
    Mar 21, 2007
    Messages:
    1,516
    I'm not sure why you would. Unless you have bypassed the heater core and didn't loop the hoses.
     
    Last edited: Mar 25, 2015
    DrDanteIII, Mar 25, 2015
    #2
  3. Mar 25, 2015
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
    Joined:
    Sep 22, 2002
    Messages:
    8,360
    I've done many TJ thermostats, and have tried drilling a small hole in them. The only thing it accomplishes is making it take longer to warm up in cold weather. The TJ cooling system is not prone to air pockets therefore does not benefit from drilling a hole in the thermostat.
     
    Patrick, Mar 25, 2015
    #3
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