MazdaSpeed3 - Throttle Body Coolant Bypass

Courtesy:mazdaspeed-3.com
Link: http://www.mazdaspeed-3.com/2011/06/mazdaspeed-3-throttle-body-coolant-bypass-diy/

For the Coolant Bypass DIY you will need about 30-45 minutes, depending on how savvy you are around an engine. Also, you will want to make sure that the engine has time to cool down since coolant temperatures reach 180 – 220 degrees. You can easily end up in the emergency room if you do not.
Where is it:

To access the throttle body coolant lines you will enter the engine from the top.
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Tools Needed:

• Socket wrench with extensions (long and short extensions)
• 10mm deep sockets
• Needle-nose pliers
• Gloves (not pictured)
• Anti-freeze to top off what you may loose when pulling hoses.

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What to do:

(1) Open up the engine as pictured above and remove the cover and top mounted inter cooler (1). To remove the inter cooler remove the three bolts, 2 in front and one in back, as well as loosen the hose clamps and bypass valve attached to the inter cooler (2-4). Once this is done lift the inter cooler off and place carefully to the side.
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MAKE SURE ENGINE HAS COOLED DOWN before proceeding. Coolant will spill during this process and can burn you.

Now we have access to the hot pipe and coolant lines on the throttle body. (1-2) Pinch the clamps and move them back on the hose. Then using needle nose pliers, twist the hose to loosen and pull to remove them. (3) This image shows the lines we want to remove and keep. The line towards the bottom of the picture is the one we will completely remove. NOT YET THOUGH! Detach the hoses at the throttle body only and then detach the throttle body pipe.
If you were as fortunate as me, and Mazda installed the clamp bolt under the throttle body pipe, use a deep socket 10mm and feel your way around until the socket is snug over the bolt, then loosen. When you reinstall this later move the bolt so it is easier to access in the future.
(4) You should now see your throttle body completely exposed, naughty throttle body! (6) Now you need to move quickly here or you wil loose a lot of coolant. As you remove the bottom of the bottom hose completely be ready to shove the top hose in its place. Clamp it down and SAVE the bottom hose. You may want to hook it back up in the winter if you live in the North or cold areas.
NOTE: Intake charge temps that are too cool can reduce horsepower because the combustion temps would be too low. Additionally, the throttle body blade can freeze and seize up which, is without saying, bad! However, this may not happen if you haven’t done an ERG Delete. ERG temps of around 1300 degrees keep things pretty warm in there anyway.

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You can either (1-3) buy caps to fit over throttle body coolant inlets or reuse the other hose to close off inlets. You don’t really want stuff getting in there.
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That is all there is to it! Now reinstall the throttle body pipe, inter cooler and top-off your coolant, if need be, and start her up!