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Running Hot Only On The Highway

Discussion in '2nd Gen. Tacomas (2005-2015)' started by MolonLabeTaco, Jul 13, 2019.

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  1. Jul 18, 2019 at 6:28 AM
    #41
    GT7

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    GT7 One piece at a time

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    I have been having similar issues, except I have the csf radiator and 160 thermostat. ambient has been 111-115, IAT between 117-122 on the freeway doing over 60. starts at 194 and climbs to 203-206. really pissing me off. but if ambient is 95, My truck wont go over 188 even if you tried.
     
    GT7, Jul 18, 2019
    #41
  2. Jul 18, 2019 at 7:18 AM
    #42
    thomas azzara

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    thomas azzara Member

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    MolonLabeTaco

    Could be thermostat is bad: Toyota 16031-0P010, Engine Coolant Thermostat Kit


    Water pumps (by Asin) for your car are $87 at
    $116 AISIN WPT-802 New Engine Water Pump with Gaskets - Compatible with Select Toyota 4Runner, FJ Cruiser, Tacoma, Tundra
    https://www.amazon.com/gp/product/B00829I3TQ/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

    Don't let it overheat.
    Coolant looks great.
    What does the gauge show on the dash? Above the markings towards overheat? Right in the middle?
     
    Last edited: Jul 18, 2019
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    thomas azzara, Jul 18, 2019
    #42
    Torspd likes this.
  3. Jul 18, 2019 at 7:27 AM
    #43
    Torspd

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    Torspd Tor-nication

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    Torspd, Jul 18, 2019
    #43
    DriverSound likes this.
  4. Jul 18, 2019 at 8:09 AM
    #44
    kidthatsirish

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    kidthatsirish Well-Known Member

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    President McKinley w/KLM 203P and threw the roof antenna, ICON RXT leaf spring packs (position 2), Bilsteen 5100s, ARE Camper Shell, Pop & Lock tail gate, Dash Cam
    I don't suppose the serpentine belt is slippng? If so your pump will not circulate coolant very well.
     
    kidthatsirish, Jul 18, 2019
    #44
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  5. Jul 18, 2019 at 9:19 AM
    #45
    Ren

    #45
    Ren Well-Known Member

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    Any time I have had overheating issues on any of my vehicles, I usually find that the thermostat is the issue. 9 times out of 10, replacing it solves the problem.
     
    Ren, Jul 18, 2019
    #45
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  6. Jul 18, 2019 at 10:30 AM
    #46
    Blue Truck

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    Blue Truck Well-Known Member

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    206 isnt that hot
     
    Blue Truck, Jul 18, 2019
    #46
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  7. Jul 18, 2019 at 10:47 AM
    #47
    GT7

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    I know. Still pisses me off and I dont like it. I like staying below 190. Just my preference
     
    GT7, Jul 18, 2019
    #47
    MolonLabeTaco[OP] likes this.
  8. Jul 18, 2019 at 11:28 AM
    #48
    Torspd

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    Torspd Tor-nication

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    Drive faster ;) or down shift for faster circulation with less engine load.

    Superchargers will also add more heat to the engine bay.
     
    Torspd, Jul 18, 2019
    #48
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  9. Jul 18, 2019 at 11:29 AM
    #49
    hemitruk

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    hemitruk Old man , young boi truk

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    If temp gets up there it should kick in even on highway. . Our delivery trucks on freeway going at 55 can hear clutch kicking in . Anyway hope you solve problem . Hate problems that are a pain in the ass . One of reasons took early retirement . Got sick doing it . But modding and stuffs a different story . :bikewheelie2:
     
    hemitruk, Jul 18, 2019
    #49
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  10. Jul 18, 2019 at 12:17 PM
    #50
    MolonLabeTaco

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    MolonLabeTaco [OP] Well-Known Member

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    I ordered a new Toyota t-stat and it’ll be here Monday. Dash gauge stays just slightly above center and doesn’t move either way once the truck is warmed up.
    If all this doesn’t fix it, I’ll try a water pump but I’ve read most people say there’s looks new after 150K.
     
    MolonLabeTaco, Jul 18, 2019
    #50
  11. Jul 18, 2019 at 12:18 PM
    #51
    MolonLabeTaco

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    MolonLabeTaco [OP] Well-Known Member

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    I know it’s kicking in but it’s not really doing any good as the 65+ mph wind in front of the radiator is way more output than the fan could ever think of being.
     
    MolonLabeTaco, Jul 18, 2019
    #51
    hemitruk[QUOTED] likes this.
  12. Jul 18, 2019 at 1:07 PM
    #52
    garciav

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    garciav Well-Known Member

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    garciav, Jul 18, 2019
    #52
  13. Jul 18, 2019 at 2:46 PM
    #53
    Torspd

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    Torspd Tor-nication

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    Yes
     
    Torspd, Jul 18, 2019
    #53
  14. Jul 18, 2019 at 2:54 PM
    #54
    EatSleepTacos

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    EatSleepTacos Well-Known Member

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    Disclaimer, read the first page and hopped to the end.

    It sounds completely normal IMO. I watch my UG religiously so I have a decent idea on normal engine temp.

    It can certainly get hotter with speed because the engine is working harder to maintain that.

    Coolant and new thermostat is a good idea anyways and very easy to do. For thermostat, you’ll need a 10mm on a u joint but that’s it. It’s seriously easy.
     
    EatSleepTacos, Jul 18, 2019
    #54
    ecliff5, MolonLabeTaco[OP] and b_r_o like this.
  15. Jul 18, 2019 at 3:01 PM
    #55
    Steves104x4

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    Steves104x4 Well-Known Member

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    BUCKLE UP! It makes it harder for Aliens to pull you out of your Truck.
    Remove the weatherstrip at the base of the windshield to let heat escape
     
    Steves104x4, Jul 18, 2019
    #55
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  16. Jul 18, 2019 at 3:09 PM
    #56
    thomas azzara

    #56
    thomas azzara Member

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    Does the heat range stay within the "normal/grey" area on the gauge after ten minutes of running?
    206 degrees is not that hot and not an overheat.

    246 F might lead to an overheat.

    IMO you do not have an overheat situation. I.E. Your cooling system is running normally.

    You wrote: "Dash gauge stays just slightly above center and doesn’t move either way once the truck is warmed up"
     
    thomas azzara, Jul 18, 2019
    #56
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  17. Jul 19, 2019 at 10:25 AM
    #57
    MolonLabeTaco

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    MolonLabeTaco [OP] Well-Known Member

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    206° isn't overheating but it is hot. Whether it's hotter than normal for a '12 Tacoma, I do not know. To me it seems to be a bit too hot but I could be wrong. I've spent a fortune on prior vehicles to lower my coolant temp by 10° & I will again w/this Taco. It's an OCD thing I think.
     
    MolonLabeTaco, Jul 19, 2019
    #57
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  18. Jul 25, 2019 at 9:13 AM
    #58
    MolonLabeTaco

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    MolonLabeTaco [OP] Well-Known Member

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    Yesterday I:
    drained all 3 drains (left on block, right on block & radiator)
    filled the system w/ distilled H2O (it would only take a little less than 2 gallons, supposed to take almost 3)
    ran it for 15 minutes
    drained all 3 holes again (it came out very pink still from the rad.)
    replaced both rad. hoses, rad. cap & t-stat w/housing
    refilled w/<2 gallons of Zerex made for Toyotas
    ran for 30 minutes burping the system

    None of that really seems to have made a difference but we got a "cold" front here so the highs are only 88° & I haven't gone on a long highway drive.


    Would've only been about 1 hour worth of work but I dropped one of the nuts that hold the t-stat housing & couldn't figure out where it went for 30+ minutes searching. It first fell behind the fan pulley so I removed the belt, fan & pulley. Then it dropped again & I spent another 30+ minutes trying to find it. After searching & almost giving up, I decided to bump the motor over a couple times to see if it'd pop out somewhere. Well, after doing that I saw that the damn thing fell behind the crank pulley!!! Luckily, there's slots in that pulley & I didn't have to remove it. Took an extra hour+ due to dropping that damn nut.
     
    Last edited: Jul 25, 2019
    MolonLabeTaco, Jul 25, 2019
    #58
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  19. Jul 25, 2019 at 10:07 AM
    #59
    Toy4me

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    Toy4me Well-Known Member

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    Surprising how difficult dropping a nut can make a guys’ life :anonymous:
     
    Toy4me, Jul 25, 2019
    #59
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  20. Jul 25, 2019 at 10:13 AM
    #60
    MolonLabeTaco

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    MolonLabeTaco [OP] Well-Known Member

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    :rofl::spending:
     
    MolonLabeTaco, Jul 25, 2019
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Page 3 of 4

Products Discussed in

Mishimoto MMTS-4RUN40-03 Racing Thermostat Compatible with Toyota 4Runner 2003+
$62.51
AISIN WPT-802 New Engine Water Pump with Gaskets - Compatible with Select Toyota 4Runner, FJ Cruiser, Tacoma, Tundra
$115.95
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