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  • Coolant temperatures

    G'day all,
    Just chasing some coolant temperature figures from those with an aftermarket coolant temp gauge/scangauge/ultragauge.
    Mine seems to sit around 88 degrees. On a long climb (the freeway uptrack for those in SA) I will reach 97-100 degrees on a 25 degree day. The stock gauge doesn't move from its position at all.
    On flat roads in 35 degrees at 110kmph i will see nothing below 91-92 cruising.
    Wondering what others get on their gauge to see if the numbers I'm getting are normal?

    Cheers!

  • #2
    My 2.8 sits on 83. 35 deg day stuck in traffic it goes all the way up to 85- the highest I have seen

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    • #3
      I have an OBD unit (Ultragauge) talking to my dash mounted ipad and 88-89 is normal once up to temp. I've seen as low as 85 in the southern winter and as high as 91 in the hot Pilbara summer towing a two tonne boat averaging 21-22l/100km so the engine was under consistently high load.

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      • #4
        Mines the same as yours Jimmy but will go over 100 up a big range on a hot day.
        My radiator is also full of grass and mud which doesn't help.

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        • #5
          Originally posted by 404pug View Post
          My 2.8 sits on 83. 35 deg day stuck in traffic it goes all the way up to 85- the highest I have seen
          likewise for me , using a scanguage 2.

          BTW its normal for the dash temp guage not to move , they are dampened and will only go upwards once very hot temps ( aka overheating ) are close.

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          • #6
            Glad to know my temps are fairly normal although I do seem to sit a couple of degrees above normal for some of you guys (I have a 3.0 btw).
            Maybe my radiator needs a good clean. I sprayed it with a hose from the front a few months back but have the AC condenser to get through to get any water to the radiator. From the brief stuff I've read the best bet is to remove the radiator which seems like a pain in the bum.

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            • #7
              Originally posted by JimmyC View Post
              Glad to know my temps are fairly normal although I do seem to sit a couple of degrees above normal for some of you guys (I have a 3.0 btw).
              Maybe my radiator needs a good clean. I sprayed it with a hose from the front a few months back but have the AC condenser to get through to get any water to the radiator. From the brief stuff I've read the best bet is to remove the radiator which seems like a pain in the bum.
              Another thing to think about is the viscous fan hub and if this is working correctly. Can you here the fan roar when its forty degrees outside with the AC on.

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              • #8
                Originally posted by MacroP View Post
                Another thing to think about is the viscous fan hub and if this is working correctly. Can you here the fan roar when its forty degrees outside with the AC on.
                I believe the fan is still working as normal. If not working would't it overheat at idle?

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                • #9
                  Originally posted by JimmyC View Post
                  I believe the fan is still working as normal. If not working would't it overheat at idle?
                  The viscous hub for the fan is not normally fully locked at idle, just partly or even just free spinning with a bit of drag, unless the radiator is blowing really hot air on to it for some reason. If it's fully engaged at idle you will know. There's an integrated thermatic (temp) valve located in the hub that locks it when very hot (using a silicone fluid). You can tell the hub is fully engaged - the engine fan make a noticeable roar as it spins up. Wind noise sometimes blocks this noise at highway speeds. Easy to hear when driving much slower with the driver's window down. The fan hub, when fully engaged, absolutely kills fuel economy when driving.

                  I put my Prado (2010 Kakadu) through it's paces the other day on my local beach and it was pretty hot (36 degrees). Mainly there to test my new twin trans cooler install and go fishing too. I have an Ultragauge bluetooth ODB unit plugged in talking to my dash mounted ipad. I can watch the trans temps as well as the engine coolant temp altogether. I got the engine to full load (30+l/100km) @ 60km/h on very soft sand for around 15 minutes. Tyres @ 16PSI. Engine temp peaked at 94 degrees and I could certainly hear the roar of my fan hence the viscous fan hub was fully locked and working properly. Engine temp dropped back to around 88-89 once I went back on the black-top later in the day. That was the highest stress this Prado has ever seen so I wouldn't expect higher that 94 degrees unless something is faulty. This highest on black top I've seen is 91 degrees towing on a very hot day. On a side note, my trans' Torque Converter temp only got to 101 degrees down from 130-140 degrees. Very happy with that result.

                  If the fan hub is not fully locking the engine temp can rise especially at lower speeds with low air flow (like driving on a beach or up a step hill). With the dozen or so Toyota diesel 4WDs I've owned over the last 25 years - In my experience - the viscous fan hub is always something to look at when having higher than expected engine temps as well as the radiator and other cooling bits obviously. The fan hub is often overlooked.

                  You're seeing a potential 12 degree change (88-100) from low load to high load at the same ambient temp. I'm only seeing a max of 6 degree change under extreme load (88-94) with lower overall peak temps (94) on a higher ambient day (36).

                  I think you're on to something - I would keep looking further into this. Hopefully other members with a similar vehicle can report in over time.

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                  • #10
                    Interesting write up. Glad to see you get better trans temps with the cooler though, they are worth their weight in gold. At least it seems that around the 88 degree mark is normal for everyone. A difference in 'raised' between yourself and myself is interesting. I have had my fan hub checked and all functioning normally. The water pump is near-new and coolant isn't that old either.
                    Not sure if you're familiar with the freeway hill in Adelaide but we're talking a climb from near sea level to 1900ft altitude in about an 8km stretch at 100kmh, a hard sell for a 2.8 ton, 4 cylinder car.
                    I am leaning towards cleaning the outside of the radiator to see how that helps to improve airflow. Will avoid having to remove the radiator if i can but from what I have read spray degreaser in the front, let sit and spray with hose from the back-side. As you know space is tight behind the rad so will try a piece of 12mm solid poly pipe with a 90 degree connector on the end cut down to make it as narrow as possible.
                    I can't find anything online about the removal of a 150 radiator to help on that point.

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