It is in the coolant expansion tank
Problems with this sensor are common as they are pourous and take up coolant, eventually sinking and bringing on the coolant check light. You most likely will need to change the coolant expansion tank to cure the problem as it is usually sold as a unit.
Kev
The 2003 Mazda engine coolant temperature sensor is located on the front of the engine, above the thermostat housing. The sensor will have to wires leading to it.
At the back of the engine on the coolant outlet that goes to the heater hoses on the firewall.
The cooling sensor, often referred to as the coolant temperature sensor, on a Mazda 626 is typically located near the engine block, usually on or near the thermostat housing. It is positioned to monitor the temperature of the coolant as it circulates through the engine. In some models, it may also be found near the cylinder head. Always consult the vehicle's service manual for the exact location, as it can vary by model year.
COOLANT sensor on mazda 6 where is it
The coolant temperature sensor should be located near the upper coolant hose where it enters the engine block, just a few inches nearer to the windshield. It is usually a gold color.
On a 2006 Mazda Miata, the engine coolant temperature sensor is located on the engine block, specifically near the thermostat housing. It is typically positioned on the cylinder head or intake manifold, making it accessible for wiring connections. You may need to remove some components for better visibility when servicing or replacing the sensor.
On a 2001 Mazda Miata, the temperature sensor, also known as the coolant temperature sensor, is located on the engine block. Specifically, it is typically found near the thermostat housing, on the cylinder head. This sensor monitors the coolant temperature and sends the information to the engine control unit (ECU). If you're looking for it, you may need to access it from the top of the engine bay.
no sensor only a thermostat
On a Mazda 6 diesel, the coolant temperature sensor is typically located near the engine's thermostat housing or cylinder head. It is usually situated in the cooling system, allowing it to accurately measure the temperature of the coolant as it circulates. Accessing it may require removing some components, depending on the specific model year. Always refer to the vehicle's service manual for precise location and instructions.
The Engine Coolant Temperature sensor is on the back of the engine, right in the middle (and unfortunately the most difficult place to reach!). It is mounted on the coolant outlet that connects to the heater hoses up on the firewall. It is connected by a single electrical harness and screwed in. I can't remember exactly, but I believe you can get at it with a 17mm wrench size. The same answer will apply for 1990-2005 Mazda Miatas.
left of the dashboard
The Air Temperature sensor is in the same unit as the Air Flow Meter on top of the stock air box. The coolant temp sensor is mounted on the coolant outlet on the back of the engine, center, just above the transmission.