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JDM GT Four, ST185RC and ST205.
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What's this for?

Thu Jul 04, 2019 10:54 pm

I'm currently working on a JDM 1991 GT-Four RC. The engine has been out of the car for roughly 8 months and I'm in the process of installing it back in the car.

I can't remember what this part is/where it goes. Anybody have an idea what this part is?

There is no electrical connector on it. One end looks like a breather hose/vent hose of some sort connected to a black cylinder with an arrow drawn on it (appears to indicate flow direction?). The other end of the cylinder has a long piece of hose connected to it with 2 little black adapters on them, the adapters are labeled "Koito". There is no other writing on it.

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https://imgur.com/a/YltUNCI
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Re: What's this for?

Thu Jul 04, 2019 11:14 pm

That's the heat exchanger sprayers, they mount to the backside of the bumper beam. Everything is plumbed in but non-functional from the factory, one of the vertical connections will flow to the sprayers but the other one is a dead end (stock it goes to the dead end). There's an extra pump on the washer tank and a relay buried in the fender, if you dig around the bottom of the fender by the washer tank there's a connector that will trigger the relay and the pump to make the sprayers work.

My relay was dead so I wired in another one (the OEM one is only used on one other car and very expensive) and run the trigger off a button in the cabin.

Re: What's this for?

Thu Jul 11, 2019 3:51 pm

Thank you for the reply! I will check this out.
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