2008 MS3 running hot

Discussion in 'Mazdaspeed 3/6 Engine' started by crooked deal, Jun 27, 2020.

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  1. crooked deal

    crooked deal Greenie N00B Member

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    Hey everyone,

    Just joined the forum today, I was somewhat active on the old forum back in the day.
    I have a 2008 MS3, about 90K miles, owned the car for 10 years. Just did a bunch of work, cleaned the intake valves, installed thermal gaskets on TB and intake, while it was apart I also did an EGR delete and TB coolant bypass.
    I have now noticed the car is running much hotter than it has in the past. Before I would see ECTs no higher that 200 with the AC running in summer temps. Now the car is running between 210 and 215, with the heat running full blast, without heat it will get hotter, but the dash gauge still is not showing a high temp, it's still below halfway.
    I have burped the cooling system twice just in case I introduced an air bubble when doing the TB coolant bypass, but no change. Both large radiator hoses are eventually getting hot, so I guess the thermostat is opening, but maybe not fully? The car has not went past 225 deg.
    I'm stumped, obviously this happening after all of the work I did makes me think it might be related.
    Any advice would be greatly appreciated, and hello to everyone on the forum!
     
  2. Raider

    Raider Administraider Administrator Platinum Member

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    It's normal.
     
    Raider, via a mobile device, Jun 27, 2020
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  3. crooked deal

    crooked deal Greenie N00B Member

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    Do these cars tend to run a little hotter without the EGR system functioning? Thanks for the info!
     
  4. jsmith

    jsmith Silver Member

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    Heat running full blast, with the a/c button pressed, should be keeping it below the max temp (215).
     
  5. Awafrican

    Awafrican Silver Member

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    This

    It's probably more that bypassing the TB coolant has reduced the surface area for the coolant to go through, and with the cold air coming I to the TB there has to be some cooling of the Coolant and warming of the intake air, wait that's the reason you bypass the TB cooling.
    Speeds run hot, fans only kick on at what 220-225? IIRC
     
    Awafrican, via a mobile device, Jun 28, 2020
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  6. jsilva

    jsilva Silver Member

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    So the reason for the throttle body coolant bypass is to reduce the intake air temperature? And there is minimal side effect from doing this? So then I’m assuming the coolant goes through the throttle body just as another source of coolant cooling?
     
    jsilva, via an iPhone, Jun 28, 2020
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  7. Raider

    Raider Administraider Administrator Platinum Member

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    Coolant runs through the throttle body to keep it from freezing in the areas it gets stupid cold.
     
    Raider, via a mobile device, Jun 29, 2020
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