ok.. subject is a 97 sunfire w/ 2.4L. Can someone tell me what sensor that is that is directly below the IDI plug. It goes into the head and has a plug on it. It is on the right side of the engine if looking to the rear. I believe coolant is leaking from this sensor. I also found coolant around the coolant return line coming from the engine going to the resevoir. Any idea how hard it is to replace those coolant lines? Reason i know there is a leak is every once in a while when its pretty warm out and after running the car for an hour or so, I park and 15 minutes later there is a puddle of coolant under the car. I can only see fluid coming from the right side of the engine so im pretty sure its not a water pump or thermostat.


Thanks for the help

Justin

Most common cause seems to be a faulty O ring on the water neck, on the right side of engine (driver side) under the power steering pump.