Having problems with your 2002 Mazda Protege ?
Engine cooling fan run all the time when car is running. had t stat replaced recently. what controls the fan relay?. unplug coolant sensor and fan stays running. need a wiring diag.
Hi, the relay is turned on by the PCM based on data from the coolant temperature sensor. Disconnecting the sensor sends the computer into safe mode so it keeps the fan on. Check the sensor wire continuity to the PCM. If good, try replacing the sensor. Please let me know if you have more questions.
Repair Help & Product Troubleshooting for 2002 Mazda Protege
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