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Hi,
I'm new here, I joined because I just acquired a 1987 prelude si that seems to run well. I'm having trouble figuring out what sensors are what on the coolant housing left of the engine. Based off of other internet images, I believe the red circle in both of the images is the temperature sender. But I am missing a sensor that is hidden in most other posts online, circled in yellow.

Here is somone elses internet picture:



Here is mine:



This yellow circled sensor/mechanism is broken off, it looks like two wires went in it. Does anyone have any ideas of function or part number? Would anyone know where that sensor is wired to?

Thanks,
muzzy
 

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I don't remember what the smaller switch (red) is for, but you can pick one up from Rock Auto for $10. It is a single wire connection.

https://www.rockauto.com/en/moreinfo.php?pk=488634&cc=1169704&jsn=9

Your other problem (yellow) is not a switch, but a thermovalve that is used for the emissions system. Essentially, it opens when coolant temp is above 131 F, allowing vacuum to pass through opening the purge valve, purging fuel vapors from the charcoal canister back into the intake manifold. I can see in your picture, one of the two vacuum lines that should be attached to it. You can also pick one of these up on Rock Auto, but they're more expensive.

https://www.rockauto.com/en/moreinfo.php?pk=6994816&jsn=799
 
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