1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

What causes an A/T to heat up?

Discussion in 'Technical Chat' started by knayrb, Mar 20, 2015.

  1. Mar 20, 2015 at 11:39 AM
    #1
    knayrb

    knayrb [OP] Well-Known Member

    Joined:
    Mar 3, 2010
    Member:
    #32473
    Messages:
    1,736
    Gender:
    Male
    Somewhere in the square states
    Vehicle:
    2010 Dbl-Cab Off-Road
    Pure stock
    Teach me something.

    I do not have an issue with this but was wondering the root cause for the heat in an automatic transmission. Don't confuse this with the practice that heats it up like heavy towing. I want to know WHY towing or other uses adds heat to a A/T. In my mind I see the only areas of friction would be a clutch pack or band. If they are slipping or are engaging frequently that would cause heat. Other than that what really causes the heat. The gears are practically submerged in oil. There is no combustion going on. The torque converter is basically 2 turbines with oil between them so no physical hard surface contact. Some heat would transfer to the A/T from the engine block. I don't understand where the heat comes from.
     
  2. Mar 20, 2015 at 4:49 PM
    #2
    gearcruncher

    gearcruncher Well-Known Member

    Joined:
    Nov 1, 2012
    Member:
    #90305
    Messages:
    6,152
    Gender:
    Male
    First Name:
    Canadain bumper technician
    Great white North 51.0333° N, 93.8333° W
    Vehicle:
    2010.TRD.SportDCLB4x4Limited leather package
    TRD Sport Rally -5 speed automatic Limited ,Factory heated leather seats ,chrome package,Super white with front windows tinted to 35 % Dick Cepek DC-2 wheels Summer tires - Good year silent armor P265/65R17 Winter tires - Good year P265/65R17 Ultra Ice studded Illuminated 4x4 switch TRD 3rd brake light cover ($20) TRD seat belt shoulder protectors (5). ($50) TRD ...B pillar emblems ($20) TRD rear slider sticker with devil horns ( $6) TRD summer floor matts ($60) TRD steering wheel emblem ($20) TRD floor pedals .($95) TRD shorty antenna ($14) TRD front Windshield emblems ($17) TRD head pillows .($60) TRD head rest protectors TRD door scuff protection $20 TRD floor matt emblems ($40) TRD tow plug emblem . ($40) TRD cigarette lighter with LED.($35) TRD tissue dispenser ($12) TRD front bezel emblems ($9) TRD door emblems ($6) TRD lanyards($9) TRD lisence plates with TRD bolts($50) TRD fender emblems TRD center caps Part Number:PT904-35070-CC ($80) TRD cd
  3. Mar 20, 2015 at 5:02 PM
    #3
    robssol

    robssol If it ain't broke, leave it the eff alone!

    Joined:
    Jun 4, 2013
    Member:
    #105622
    Messages:
    7,653
    Gender:
    Male
    First Name:
    Rob
    S. Wisconsin
    Vehicle:
    06 Tacoma, TRD Sport, SR5, 4X4, AC
    Frame 2.0, Fog lights anytime, Seatbelt reminder delete, Secondary air filter delete, LED bed lights, Running boards, 2017 Rims, Devil Horns by Andres, Ultra gauge, Cup holder/consol/glove compartment lights, Interior LED conversion, Blue Sea aux. fuse panel, fuse panel mounting plate by Yotamac, ProEFX heated towing mirrors, LED engine bay lights, Redline Quicklift Elite hood struts, Wet Okole Heated Seat Covers, Pop and Lock tailgate theft deterrent mod 2.0, Plasti-dip rear bumper. Decal free visors, Washable cabin air filter, Overhead consol auto dimming override switch, BulletProof Fabricating Skid plate, 2lo module.
    Shifting, shifting, more shifting. Under load, like vehicle weight, and towing. Oh and are you aware of how many clutch packs are in the A750F? 7 these packs are engaging and disengaging with each shift=HEAT
     
  4. Mar 20, 2015 at 6:03 PM
    #4
    knayrb

    knayrb [OP] Well-Known Member

    Joined:
    Mar 3, 2010
    Member:
    #32473
    Messages:
    1,736
    Gender:
    Male
    Somewhere in the square states
    Vehicle:
    2010 Dbl-Cab Off-Road
    Pure stock
    So if I get this right just having the fluid moving around inside a torque converter creates friction and heat? If that's the case then I can see how towing and other heavy use can cause heat. There would be more resistances on the fluid from the engine side to the drive side of the torque converter. I wouldn't think fluid movement would generate much friction.
     
  5. Mar 20, 2015 at 9:45 PM
    #5
    robssol

    robssol If it ain't broke, leave it the eff alone!

    Joined:
    Jun 4, 2013
    Member:
    #105622
    Messages:
    7,653
    Gender:
    Male
    First Name:
    Rob
    S. Wisconsin
    Vehicle:
    06 Tacoma, TRD Sport, SR5, 4X4, AC
    Frame 2.0, Fog lights anytime, Seatbelt reminder delete, Secondary air filter delete, LED bed lights, Running boards, 2017 Rims, Devil Horns by Andres, Ultra gauge, Cup holder/consol/glove compartment lights, Interior LED conversion, Blue Sea aux. fuse panel, fuse panel mounting plate by Yotamac, ProEFX heated towing mirrors, LED engine bay lights, Redline Quicklift Elite hood struts, Wet Okole Heated Seat Covers, Pop and Lock tailgate theft deterrent mod 2.0, Plasti-dip rear bumper. Decal free visors, Washable cabin air filter, Overhead consol auto dimming override switch, BulletProof Fabricating Skid plate, 2lo module.
    Last edited: Mar 20, 2015

Products Discussed in

To Top