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  1. #1
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    Post 2017 Fortuner GD6 2.8 4x4 Overheating

    I bought a 2017 Fortuner 2.8 4x4 Auto about a week ago. When you drive the car at any speed below 120km/h it runs smoothly but anything above 120 the heat gauge rises rapidly. Sometimes when you lift your foot off the accelerator the heat gauge will rapidly drop back down to just below halfway. The heater also doesn’t blow out hot air.

    Changed Radiator, Visco, Water Pump and Thermostat. Still does the same.

    Disconnected all water hoses and ran water through the system with a hose. All water channels are open.

    I’ve put radiator flush in and drove about 15km and got to a speed of 170 km/ph without the heat gauge rising and the heater was working perfectly - thought the problem was solved until it unexpectedly heated up again.

    This seems to happen every time the car goes into boost.
    Last edited by Jannieauc; 2021/02/27 at 08:10 PM.

  2. #2
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    Default Re: 2017 Fortuner GD6 2.8 4x4

    Blown head gasket symptoms.

    But that doesnt explain the interior heater not working.

  3. #3
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    Default Re: 2017 Fortuner GD6 2.8 4x4

    Might be an airlock in the cooling system. Are you bleeding it correctly and ensuring that the heater is on warm and running when you are filling?

    Replace the coolant sensor too.

  4. #4
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    Default Re: 2017 Fortuner GD6 2.8 4x4

    Quote Originally Posted by Charlie Brown KZN View Post
    Might be an airlock in the cooling system. Are you bleeding it correctly and ensuring that the heater is on warm and running when you are filling?

    Replace the coolant sensor too.

    Thanks for the reply.

    I bled the cooling system correctly and had the heater running while filling.

    Can’t see how the sensor can be the problem though. The heat gauge is not just showing the car is running hot - The engine is actually running so hot that the water is boiling.
    Last edited by Jannieauc; 2021/02/27 at 09:19 PM.

  5. #5
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    Default Re: 2017 Fortuner GD6 2.8 4x4

    [QUOTE=Charlie Brown KZN;4591843]Might be an airlock in the cooling system. Are you bleeding it correctly and ensuring that the heater is on warm and running when you are filling?

    Replace the coolant sensor too.[/QUOTE
    Last edited by Jannieauc; 2021/02/27 at 09:17 PM.

  6. #6
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    Default Re: 2017 Fortuner GD6 2.8 4x4

    Quote Originally Posted by Kaboef View Post
    Blown head gasket symptoms.

    But that doesnt explain the interior heater not working.
    Thanks, will have a look.

  7. #7
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    Default Re: 2017 Fortuner GD6 2.8 4x4

    I understand this is not the answer you are looking for - but you are only a week into ownership - can you not cancel the deal? A problem like this on a vehicle (no matter that it is used) just bought, will drive me nuts. Also, your problem obviously existed already when you did the deal - what other damage could possibly surface later?

    However, I hope it is something minor.
    Jaco Nell

  8. #8
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    Default Re: 2017 Fortuner GD6 2.8 4x4

    Sorry for your troubles seems very odd and frustrating I am sure.

    Maybe loan a thermometer that you track / test different areas, pipes as it heats up.

    Might point you in the right direction.

    thermal camera might help too, similar concept, might be a blockage somewhere.

  9. #9
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    Default Re: 2017 Fortuner GD6 2.8 4x4

    Without knowing the history of this vehicle I would be very cautious.

    Sounds like an airlock in the cooling system. But then why would the cooling system have air?

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