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

Running Hot

Discussion in '1st Gen. Tacomas (1995-2004)' started by Jonah.sloven, Nov 10, 2020.

  1. Nov 10, 2020 at 2:10 PM
    #1
    Jonah.sloven

    Jonah.sloven [OP] Active Member

    Joined:
    Nov 15, 2019
    Member:
    #310817
    Messages:
    32
    Gender:
    Male
    Hey y'all
    So noticed today that my thermostat was a hair higher than it normally is. I checked the coolant and Im about half full, would that make a difference? I am topping it off once it cools down. Maybe I am paranoid but the gauge is slightly above halfway which is where its always been. Any ideas or reasons to worry? Thanks!

    IMG_2551.HEIC.jpg
     
  2. Nov 10, 2020 at 2:13 PM
    #2
    coopcooper

    coopcooper certified youtube mechanic

    Joined:
    May 12, 2017
    Member:
    #218843
    Messages:
    5,713
    Gender:
    Male
    alberta canada
    Vehicle:
    black on black on black 05 trd off road
    stickers and sticker accessory's
    Looks normal?

    And by "half full" you mean the tank was half full? cause its not supposed to be full
     
    wilcam47 likes this.
  3. Nov 10, 2020 at 2:14 PM
    #3
    JasonLee

    JasonLee Hello? I'm a truck.

    Joined:
    May 9, 2014
    Member:
    #129454
    Messages:
    6,547
    First Name:
    Jason
    2F23+34 Lake George, Colorado
    Vehicle:
    15 TRD Blown OffRoad
    TRD Supercharger
    It's been said on here before. That's an idiot gauge. Once it gets near / at / above H, it's too late.

    From the tachometer and white background on the gauges, it looks like you have a 2001-2004 Tacoma SR5...

    Do yourself a favor and buy a Scangauge, Ultragauge, or WiFi/Bluetooth OBD II reader and use it with a phone app to get an actual temperature reading on the coolant.

    If you have an automatic transmission, you can also program that in and see the temperature of the transmission fluid.
     
    sandsloth and GQ7227 like this.
  4. Nov 10, 2020 at 2:15 PM
    #4
    reloader403

    reloader403 Well-Known Member

    Joined:
    Feb 9, 2015
    Member:
    #148297
    Messages:
    221
    Gender:
    Male
    First Name:
    Steve
    Acworth, GA
    Vehicle:
    2003 RC 2wd 2.4 auto
    1. What are your truck specs? 2.4,2.7,3.4?
    2. When you say "half full" are you saying in the overflow tank or the actual radiator ?
    3. That gauge is somewhat accurate so if its slightly above half way its a little warm for sure....I have messed around with a scan gauge and that needle...
    4. any hard starts or rough running? CEL on?

    Good luck
     
  5. Nov 10, 2020 at 2:18 PM
    #5
    eon_blue

    eon_blue Unknown Member

    Joined:
    Mar 4, 2016
    Member:
    #180213
    Messages:
    48,211
    Gender:
    Male
    First Name:
    Ryan
    Monrovia, CA
    Vehicle:
    Supercharged 2004 3.4l TRD 4x4 Tacoma XtraCab w/5 speed
    Does the needle on the gauge normally sit a little above the middle mark like that? I know some people claim that there's does, mine has always sat dead center.

    Any way about it though, you won't know if you're actually running hot or not unless you get an accurate temp reading. Pick up an OBDII plugin off Amazon for a few bucks and download the Torque app on your phone, you can read your coolant temp along with a lot of other good info.

    I've gotten my truck up to about 208˚ pulling up long highway grades with a lot of weight in the back, and the dash gauge stays dead center. So when it starts to climb you are already getting into dangerously hot territory well before it hits the red mark.
     
  6. Nov 10, 2020 at 2:21 PM
    #6
    eon_blue

    eon_blue Unknown Member

    Joined:
    Mar 4, 2016
    Member:
    #180213
    Messages:
    48,211
    Gender:
    Male
    First Name:
    Ryan
    Monrovia, CA
    Vehicle:
    Supercharged 2004 3.4l TRD 4x4 Tacoma XtraCab w/5 speed
    As long as you aren't hearing any coolant sizzling/boiling when you pop the hood you are probably not getting "too hot", but I would still start by getting an accurate temp reading before trying to diagnose anything. For all we know it might just be that your gauge is wonky and the temp is fine.
     
  7. Nov 10, 2020 at 2:35 PM
    #7
    Jonah.sloven

    Jonah.sloven [OP] Active Member

    Joined:
    Nov 15, 2019
    Member:
    #310817
    Messages:
    32
    Gender:
    Male
    wow! thanks for all the insight so fast! the reservoir with the markings looks to be the half notch..and as far as the thermostat I recently noticed it looking a hair higher..
    I have an 03 v6 tacoma 3.4l. What is CEL? best/cheapest scanner I should get?
     
  8. Nov 10, 2020 at 2:40 PM
    #8
    eon_blue

    eon_blue Unknown Member

    Joined:
    Mar 4, 2016
    Member:
    #180213
    Messages:
    48,211
    Gender:
    Male
    First Name:
    Ryan
    Monrovia, CA
    Vehicle:
    Supercharged 2004 3.4l TRD 4x4 Tacoma XtraCab w/5 speed
    CEL stands for check engine light.

    Cheapest way to scan codes and read information from the ECU is to get an OBDII plugin from Amazon and use the Torque app on your phone. The plug in sends data via bluetooth to your phone and the Torque app displays the info on your phone.

    Other option is to get an Ultragauge or Scangauge that plugs into the OBDII port under the dash. Those gauges mount to your dash and the info is displayed as you drive
     
  9. Nov 10, 2020 at 2:45 PM
    #9
    Jonah.sloven

    Jonah.sloven [OP] Active Member

    Joined:
    Nov 15, 2019
    Member:
    #310817
    Messages:
    32
    Gender:
    Male
    got it thanks. How’s the Foxwell NT301? $50 isn’t bad
     
  10. Nov 10, 2020 at 2:50 PM
    #10
    eon_blue

    eon_blue Unknown Member

    Joined:
    Mar 4, 2016
    Member:
    #180213
    Messages:
    48,211
    Gender:
    Male
    First Name:
    Ryan
    Monrovia, CA
    Vehicle:
    Supercharged 2004 3.4l TRD 4x4 Tacoma XtraCab w/5 speed
  11. Nov 10, 2020 at 2:51 PM
    #11
    maineah

    maineah Well-Known Member

    Joined:
    Mar 24, 2011
    Member:
    #53641
    Messages:
    5,222
    Gender:
    Male
    First Name:
    Tim
    Maine
    Vehicle:
    4X4 SR5 V6 6spd
    That temp is dead spot on it is not hot it's normal Red is not pull over and let it cool off other than that drive home.
     
  12. Nov 10, 2020 at 3:02 PM
    #12
    eon_blue

    eon_blue Unknown Member

    Joined:
    Mar 4, 2016
    Member:
    #180213
    Messages:
    48,211
    Gender:
    Male
    First Name:
    Ryan
    Monrovia, CA
    Vehicle:
    Supercharged 2004 3.4l TRD 4x4 Tacoma XtraCab w/5 speed
    These engines will overheat well before the dash gauge hits the red mark.
     
    Wulf and Jonah.sloven [OP] like this.
  13. Nov 10, 2020 at 3:04 PM
    #13
    eon_blue

    eon_blue Unknown Member

    Joined:
    Mar 4, 2016
    Member:
    #180213
    Messages:
    48,211
    Gender:
    Male
    First Name:
    Ryan
    Monrovia, CA
    Vehicle:
    Supercharged 2004 3.4l TRD 4x4 Tacoma XtraCab w/5 speed
    Point is you can't go off the dash gauge, especially if you're trying to diagnose a possible issue. The variance in coolant temperature relative to the dash gauge is anything but accurate
     
    Jonah.sloven [OP] likes this.
  14. Nov 10, 2020 at 3:11 PM
    #14
    Jonah.sloven

    Jonah.sloven [OP] Active Member

    Joined:
    Nov 15, 2019
    Member:
    #310817
    Messages:
    32
    Gender:
    Male
    Ok ill have that OBDII tomorrow, thanks Amazon. Kinda nervous... but I guess first step is to see whats going on
     
    eon_blue likes this.
  15. Nov 10, 2020 at 3:37 PM
    #15
    Digiratus

    Digiratus Adventurer

    Joined:
    Mar 26, 2010
    Member:
    #34006
    Messages:
    19,998
    Gender:
    Male
    First Name:
    Mike
    Roaming the PNW
    Vehicle:
    The RedHead
    2002 XtraCab TRD 4x4 v6 Auto Trans With Lots of Mods ADS COs w/Compression Adjusters Camburg Uniball UCAs Whiteline Lower Control Arm Bushings Kartek 7" Limit Straps Plastics Guy Front Bumpstops Custom Alcan Springs +800 lbs +3" ADS 10" Stroke Triple Bypass w/Resi Rear Shocks Custom Rear Shock Relocate All-Pro U-bolt Flip w/Timbren Bumpstops 4.88 Nitro Gears ARB Front Locker ARB Twin Compressor Gunmetal 16x8 SCS Ray10s 255/85r16 Maxxis Bighorns Limited Edition (Relentless) Elite Front Bumper Smittybilt X2O 10K Winch Diode Dynamics SS3 Sport Selective Yellow Fog Lights in the Bumper Diode Dynamics SS3 Pro 4,000K Driving Lights on the Bumper Mini D2S Projectors XB35 Ballasts + 4500K Bulbs Badland Sliders FrankenFab Tire Carrier Swingout bumper w/kitchen BudBuilt Front & Bellypan Skids BAMF Rear Diff Skid Whynter 65 qt. Fridge/Freezer CVT Mt Bachelor RTT Badland Custom Bed Rack GM 140 amp alternator Dual Northstar 24F AGM batteries BlueSea 7622 ML-ACR Battery controller Peak DBI Dual Battery Voltage Monitor Doug Thorley Headers Magnaflow 18" Muffler w/upstream CAT delete 13WL Brake Calipers Braided Steel Brake Lines AFE Pro Dry S air filter ScanGauge II OBDII Scanner Kenwood TM-71A Dual Band Ham Radio Larson 70CM/2M Antenna Uniden 520xl CB radio 3' Firestik Adjustable tip antenna Pioneer DEH-P9400BH HU Alpine Amps & Type R components (F) and coaxials (R) Wet Okole Seat Covers Weathertech Digital Liners Deck Plate Mod 1" Diff Drop Carrier Bearing Drop
    Welcome to TW. :thumbsup:
     
  16. Nov 10, 2020 at 3:51 PM
    #16
    RysiuM

    RysiuM Well-Known Member

    Joined:
    Oct 18, 2015
    Member:
    #167004
    Messages:
    2,521
    Gender:
    Male
    First Name:
    Rysiu
    Was Golden State, now Poland EU
    Vehicle:
    1995 4x4 LX Ext Cab, I4 2.7, MT, 320K miles
    DD Deck+backup camera, LED DRL, All LED except H4 Hella
    Someone who thinks that the temperature reported by ECU is any better than the "idiot gauge" may be disappointed. Both sensors are basic type (thermo-resistors) with accuracy so-so. The purpose of the Coolant Temperature Sensor connected to ECU is to tell ECU when the engine reaches the "Normal Operating Temperature" so it can come out of the open loop. It is just a tad better than on-off switch as it tells the ECU when the coolant temperature goes above few predefined thresholds at which the ECU lowers the idle rpm. That's it. ECU does not care if the temperature is 180 or 190F - as long as it's above 180 it's good Normal Operating Temperature. So the sensor can be few degrees off the calibration with no real impact on the engine performance.

    The other thing is that that both sensors depend on the coolant flowing through it, so if coolant flow is stopped or restricted it will not tell you the failure on time. When the water pump stops the temperature on cylinder walls and head will be over the roof before the temperature sensor (either one) tell you something is wrong. Really the only real use for the dash needle is to tell you when you can start opening cabin heat valve - when the needle starts moving the slightly warm air will start coming in.

    I had similar issue with the gauge which on the other hand started to show slightly lower temperature that it was. I understand the pain of this thing being annoying. After verifying from the other sensor (reported by ECU) that there is nothing wrong with the engine, just the sender started to act I just replaced the sender and everything went back to normal including my OCD :D
     
    Jonah.sloven [OP] likes this.
  17. Nov 10, 2020 at 4:22 PM
    #17
    jbrandt

    jbrandt Made you look

    Joined:
    Feb 12, 2011
    Member:
    #51038
    Messages:
    15,625
    Gender:
    Male
    First Name:
    Justin
    Sacramento, CA
    Vehicle:
    '04 TRD Tacoma 4x4 DC
    Kings, J59's Total Chaos UCAs Custom skids Sticker mod
    If that were the case, I would think you'd have class action lawsuits all over the place against Toyota. That would be straight up negligence to have a "warning indicator" that doesn't actually warn you. Like a WWII air-raid siren that only goes off after the bombs explode.

    If it's anything like my trans temp sensor, even if the light comes on, you're not necessarily F'ed. One time towing a trailer up 50 I felt the trans get hot through the floorboards. Warning light never came on, but the fluid is fine (no cooked smell, color is good). Same thing with my 4Runner. trans temps got up to 240 or so (from obdII) and warning light never came on. Maybe it would have if I had sustained that temp for longer, but it was only a couple minutes. Again, trans fluid is fine.

    @Jonah.sloven if the reservoir has coolant in it, that means it bubbled over from the rad, which means the rad is now low on coolant, and that needs to be addressed. That's definitely evidence it has overheated, but that doesn't mean your engine is bad, unless you just kept driving it like that.

    The other folks are on the right track here, the OBDII may help diagnose the problem, however I'd at *least" re-fill the rad and make sure there are no air bubbles in the lines ("burp" the rad). There are many possible reasons for overheating, time to start ruling as many out as you can.
     
  18. Nov 10, 2020 at 4:37 PM
    #18
    Das it mang

    Das it mang Well-Known Member

    Joined:
    May 1, 2019
    Member:
    #291938
    Messages:
    4,282
    Gender:
    Male
    Az
    Vehicle:
    2003 5 lug 2rz
    3k into a 5 lug and it aint even LT
    Could be worse. U gtg bro.



    Nah but seriously my gauge used to be dead center but after hg, head, and ECT sensor change my gauge sits where urs is so I wouldn't worry as mentioned.

    IMG_20200906_112805.jpg
     
  19. Nov 10, 2020 at 4:39 PM
    #19
    Thomas670

    Thomas670 Well-Known Member

    Joined:
    Oct 11, 2020
    Member:
    #343506
    Messages:
    295
    Gender:
    Male
    Vehicle:
    2002 Taco Regular 5 speed
    Have you hooked up a ob2 scanner and watched your engine temp? I believe its suppose to be 180-200 range or somethinf i had a problem with my thermostat stuck open and my engine temp stayed around 136 degrees
     
  20. Nov 10, 2020 at 4:41 PM
    #20
    Thomas670

    Thomas670 Well-Known Member

    Joined:
    Oct 11, 2020
    Member:
    #343506
    Messages:
    295
    Gender:
    Male
    Vehicle:
    2002 Taco Regular 5 speed
    Your local autozone will make your borrow a scanner for free no charge
     
    Jonah.sloven [OP] likes this.

Products Discussed in

To Top