IS - 2nd Gen (2006-2013) Discussion about the 2006+ model IS models

radiator hose into black box

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Old 05-22-18, 10:57 PM
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bryceis250
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Default radiator hose into black box

guys when taking apart my radiator i discovered a short plastic tube going into a black box on the drivers side, looks like a fuse box. whats going on , whats this for?
Old 05-23-18, 09:21 AM
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MikeFig82
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I think you're talking about the ECU cooling tube.
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Old 05-23-18, 09:34 AM
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2013FSport
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I guess so. But with a radiator being 220°F, and if it leaks, is this a good thing??? Hmmm....
Old 05-23-18, 10:00 AM
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MikeFig82
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Originally Posted by 2013FSport
I guess so. But with a radiator being 220°F, and if it leaks, is this a good thing??? Hmmm....

It's just an air hose part of the fan assembly. When fans are on it's blowing air in to the box.


Last edited by MikeFig82; 05-23-18 at 10:10 AM.
Old 05-23-18, 11:07 AM
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Ya, I know. I looked at it and gave it the WTF look once. lol
Old 05-23-18, 11:12 AM
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I think its more of a ventilation thing than actual air blowing to the ECU. By the physics of it, the fans pull air from the radiator fins and with the vent being in that location, natural air movement would be pulling air from that corner thru the fans.

Originally Posted by MikeFig82
It's just an air hose part of the fan assembly. When fans are on it's blowing air in to the box.

Old 05-23-18, 11:26 AM
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MikeFig82
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Originally Posted by sinister2c
I think its more of a ventilation thing than actual air blowing to the ECU. By the physics of it, the fans pull air from the radiator fins and with the vent being in that location, natural air movement would be pulling air from that corner thru the fans.
​​​​​​That would be true.
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