kitsbeach Posted November 30, 2016 Share Posted November 30, 2016 Hey guys, I've just changed my head gaskets successfully but seem to have one plug I can't remember where to reconnect. Its right near the engine wiring harness on the passenger side rear of the engine. My temp guage doesn't work now so must be associated with that BUT mine doesn't seem to have coolant temperature sensor on the passenger side rear of engine on crossover tube like a lot of others (or if it does it is not unplugged). I'm thinking the missing end is on the body side or I would not have undone it to remove the engine. Thought maybe I tucked it up somewhere or it fell down somewhere but I've gone crazy looking everywhere and cannot find it..!! Any hints/help would be appreciated. Ken Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 30, 2016 Share Posted November 30, 2016 Probably for the oxygen sensor. The other end is probably hanging under the car or fell between the power steering lines where they go down to the crossmember. Quote Link to comment Share on other sites More sharing options...
golucky66 Posted November 30, 2016 Share Posted November 30, 2016 ^^^ agreed. almost positive that's an O2 plug. Quote Link to comment Share on other sites More sharing options...
kitsbeach Posted November 30, 2016 Author Share Posted November 30, 2016 Probably for the oxygen sensor. The other end is probably hanging under the car or fell between the power steering lines where they go down to the crossmember. ^^^ agreed. almost positive that's an O2 plug. Thanks you guys..!! There is a wire hanging down near the passenger side axle shaft. Maybe it fell down and got jammed there. I will look. Doesn't explain why my temperature gauge has stopped working though. And my fans are almost always even when the engine is cold. The gauge was working when I pulled the motor. Quote Link to comment Share on other sites More sharing options...
golucky66 Posted November 30, 2016 Share Posted November 30, 2016 (edited) Fans being on is due to an issue with the temp sensor. Ecm puts fans on full to protect engine from overheating because it has no idea what temperature the engine is at Edited November 30, 2016 by golucky66 1 Quote Link to comment Share on other sites More sharing options...
kitsbeach Posted November 30, 2016 Author Share Posted November 30, 2016 (edited) Fans being on is due to an issue with the temp sensor. Ecm puts fans on full to protect engine from overheating because it has no idea what temperature the engine is at Thanks golucky66 I can't find my sensor (or sensors). I've looked in the usual place under the wiring on the passenger side rear. Is there two on a '99.? I've been told one prong for guage and three prong for ECM but cannot see either. I'm thinking it could be that I have not plugged in one of the harness plugs well enough (maybe). But if if found the sensor I could start with that. Edited November 30, 2016 by kitsbeach Quote Link to comment Share on other sites More sharing options...
golucky66 Posted November 30, 2016 Share Posted November 30, 2016 (edited) Idk about that engine. But on the 2.5's in 2000's subarus the sensor in the middle of the engine on the crossover pipe. Sorry if that doesn't apply in your case. Edited November 30, 2016 by golucky66 Quote Link to comment Share on other sites More sharing options...
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