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09 4.0 Temp issue

Discussion in 'Technical Chat' started by dhutch, May 9, 2012.

  1. May 9, 2012 at 4:39 AM
    #1
    dhutch

    dhutch [OP] Member

    Joined:
    May 9, 2012
    Member:
    #78478
    Messages:
    7
    Gender:
    Male
    First Name:
    Dan
    Sparta NJ
    Vehicle:
    09 Tacoma 4.0 Double cab
    Hey guys newby here and have a question. Have approx. 50K on my 2009 toyota 4.0. So far been very good truck but just this past weekend my temp gauge jumped up to midway on the indicator?? It is stable but it has always been about the 1/3 range when fully warmed up. I also noticed the engine heats up very quickly now, (within 5 minutes) its at the half way point on the qauge. (It used to take 15 minutes to heat up)

    At first I thought just an indication problem (sensor) but cked with ohm meter and within spec. Now i am suspecting a failing thermostat.. Has anyone experienced this prior???
     
  2. May 9, 2012 at 5:14 AM
    #2
    boshak

    boshak Well-Known Member

    Joined:
    May 23, 2010
    Member:
    #37663
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    519
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    Male
    First Name:
    Tony
    Southern California
    Vehicle:
    2003 Manual 4x4 5VZ-FE
    OME 881's, Wheeler's 5-leaf pack, Bilstein 5100's
    Sounds like the T-Stat... I would inspect it but also have a replacement available while you have the other one off the truck.

    Check that the valve opens between 176 to 183 degrees F.

    Also, when's the last time you changed your coolant? You're coming up on 60k so now would be a good time.
     
  3. May 9, 2012 at 5:37 AM
    #3
    Lurkin

    Lurkin Well-Known Member

    Joined:
    May 21, 2009
    Member:
    #17497
    Messages:
    11,101
    First Name:
    Rod
    Pearland, TX
    Vehicle:
    09 PreRunner SR5 DC
    Interesting, but on my 09, the standard behavior is with the temp gauge at halfway and taking about 5 minutes of driving to get there. Been that way since new.

    If you are concerned, you might consider a Scangauge or Ultragauge so that you can see the actual water temps. According to my Scangauge my stock temp gauge gets to about halway at 180 and has stayed there at least through 205 (highest I've ever seen it) and doesn't move.
     
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