on my 88 there are 2 below the front of the throttle body/thermostat housing and the one in the big housing a little farther back as i understand there is a sensor and a switch dunno which is which the one underneath has a different name than coolant sensor(?) one test is negative probe on battery neg., test negative wire at sensor for voltage, should be zero of course positive will vary voltage as it warms... this should distinguish the switch from the sensor for you
oh *rap i have a RE and yours look a little different sorry plus i don't even know about the ones on the R but you should be able to test them pretty easy like i mentioned and if it mounts into a coolant passage, it's a coolant sensor... of some sort that loose wire looks exactly like my coolant temp. sender for the dash guage i believe
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