Originally Posted by dr.lee.baugh
Are you sure you got all the air out after replacing the pump?
If there is enough air in the system, it will certainly not circulate the coolant properly.
You could also check the thermostat. If that is stuck it will not allow proper coolant flow.
I doubt there is actually anything wrong with the sensor, as the coolant should still get hot (even if the sensor is garbage) since the thermostat is mechanical and not electrical.
I checked for air. Squeezed the hoses for a while. Got it all out and refilled with coolant. Had to be the sensor bc I was getting a sensor error code. And get this.. I'm thinking well FML dealer is gonna crush me for this sensor in price probably. My GFs brother has a buddy with a garage where he rebuilds R titles from the south and resells them ... He has a wrecked WK. we took the sensor from that, put it in my WK and presto! Good as new.
So seems problem was.. Needed new water pump and new coolant temp sensor.
No noise coming from engine now. No crappy idle noise. And temp gauge is just under halfway like normal. Got a little lucky thankfully with the sensor in the wreck the guy had sitting around.