S2000 Under The Hood S2000 Technical and Mechanical discussions.

koyo radiator problem

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Old 06-21-2007, 05:03 AM
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Originally Posted by s2kballin,Jun 20 2007, 10:31 PM
where is the bleeding bolt at i can't find it?
If you are looking at the engine from the driver side of the car with the hood up, it will be on the front left corner of the engine block, where the intake manifold bolts to the cylinder head. It is a 10mm bolt with a hole in the center of it that the air/coolant bleeds through. Hope this helps, if not i'll post pictures.
Old 06-21-2007, 05:51 AM
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With regard to the bleeder screw, just because you can unscrew it by hand, doesn't mean you can tighten by hand (unless you want to see smoke spewing from under your hood while driving, then when you pop the hood see a bluish geyser erupting). Tighten it to oem torque spec!!!! Not that I would know from experience or anything.......

Just remember this mantra: "the torque wrench is your friend."
Old 06-21-2007, 08:01 AM
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just get the proper Koyo cap for their radiator.
Koyo cap

"Koyo Racing 1.3 Bar Hyper Red Radiator Cap raises the cooling system pressure 1.3 bar to improve entire cooling system flow. Higher pressure cap reduces the chance of air from entering the system compared to the factory cap. It also improves the look of your engine bay."
Old 06-21-2007, 08:33 AM
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we have spoon radiator caps that fits koyo radiators instock! you cant use your stock one.
Old 07-16-2007, 09:44 AM
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I second the "use a torque wrench" advice. I ruined mine even with the torque wrench, so be careful!

J
Old 07-16-2007, 10:01 AM
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There is also another bleeder located on the firewall, dead center.
Old 07-16-2007, 05:45 PM
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Run car with the radiator cap off. When the fan cycles(AC off and Heater control all the way too the hottest position with fan motor off) top off with honda coolant. Then cap off. Top off overflow to max position.


After a coolant service(drain and fill). Loosen bleeder screws. Then fill with coolant until a steady stream of coolant flows from the bleeder. Make sure heater control is to the MAX heat position(this allows circulation through the heater core). Then run car and top off as necessary until the radiator fan cycles. Top off and cap the radiator. Another step that aids in this process is to take off the heater bypass hose to the throttle body(the highest point of the cooling system). Then top off coolant(car off and climate control to max heat setting). Then the rest of the process. Be patient. It takes some time for the thermostat to open, and fan to cycle. hope this helps. Basically in the trade this is called "burping" the system. All air must be purged from the system before system is capped off by the radiator cap.
Old 07-17-2007, 03:06 AM
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I find it helpful to have the front of the car up on ramps to aid in the air bleeding process.
Old 07-17-2007, 11:42 AM
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Originally Posted by CoralDoc,Jul 17 2007, 03:06 AM
I find it helpful to have the front of the car up on ramps to aid in the air bleeding process.
wouldn't that make the radiator the highest point of the cooling system?



i recall the toyo uses nissan oem sized rad cap, someone please confirm this
Old 07-17-2007, 12:00 PM
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Originally Posted by iam7head,Jul 17 2007, 01:42 PM
wouldn't that make the radiator the highest point of the cooling system?



i recall the toyo uses nissan oem sized rad cap, someone please confirm this
Confirmed


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