Are both lines hot that go into and out of heater core? Plugged heater core will result in no heat, or other restriction.
stop an engine
The coolant sensor is the two wire sensor that is next to the thermostat housing.
The engine coolant temperature sensor is usually on the front of the engine. The coolant temperature sensor will be in the vicinity of the thermostat housing.
no sensor only a thermostat
coolant temperature sensor are located where the coolant runs in the block near the thermostat housing normally the connector are on top of the sensor and the sensor itself screws in with a deep socket. The temperature sensor is usaully located where the coolant runs OUT of the engine close to thermostat housing.
possibly the water pump
The coolant temp sensor is located next the the thermostat housing.
The coolant temp sensor is located next to the thermostat housing.
Coolant temperature sensor is located on the front of the engine. The coolant temperature sensor is a few inches above the thermostat housing.
beside thermostat
By the thermostat
If it's overheating, it cold be thermostat, radiator or possibly other problems. If it's not overheating it could be the coolant level sensor.