Where is the fan relay of the Sylphy located?
5 Answers
Nissan Sylphy's fan relay is located next to the battery in the engine compartment. The specific steps to locate it are as follows: 1. Open the driver's door of the Sylphy. 2. Pull the hood release lever located on the left side of the driver's leg area. 3. Lift up the engine hood of the Sylphy. 4. Use the support rod to secure the hood in the open position. 5. The fan relay is located next to the battery in the engine compartment. Additional information: The engine control ECU uses signals from the coolant temperature sensor and the air conditioning switch to control the fan motor circuit via the fan relay, thereby regulating the operation of the fan.
When my Sylphy had fan issues before, I also had to locate the relay. Open the engine bay, and you'll see a black fuse box on the driver's side near the rear of the headlight. Remove the box cover, and there's a circuit diagram printed on the back—look for the one labeled COOLING FAN or RADIATOR FAN, that's the fan relay. Last time I replaced the relay, I found a trick: turn the AC to maximum fan speed, and you can feel the relay clicking and vibrating when you touch the box. In older Sylphy models, the relay might be under the dashboard on the driver's side, requiring you to bend down and remove the side panel. When replacing it yourself, make sure the model matches, as installing it wrong can cause the fan to run continuously and drain the battery.
While repairing cars, I've encountered several cases of Sylphy fan failures related to the relay. The relay is hidden in the engine compartment fuse box on the driver's side, near the firewall position. Use your fingernail to pry open the plastic clip, then locate the third relay according to the icons on the back of the cover plate - the one with the fan blade symbol is the correct one. If you find the relay contacts burnt black, don't rush to replace it. First test the pin voltage. Once I encountered a case where the wiring harness was gnawed by rats, causing two relays to be replaced unnecessarily. Remember to disconnect the negative battery terminal first. Last time an apprentice removed it without disconnecting power, causing the connector to arc and burn the terminals.
I have some experience replacing relays myself. The fan relay for the Nissan Sylphy is located in the black square box under the hood. Be careful not to break the clips when lifting the cover. It's important to take a photo of the original relay position with your phone, as beginners have plugged it into the wrong slot and burned out the control module. It's safer to perform this operation when the engine is cold. Last time, while I was halfway through the removal, the cooling fan suddenly started, sending the wrench flying and scratching the fender. If the fan still doesn't run after installing the new relay, it might be an issue with the temperature sensor, which is common in older cars.
The relay is specifically located in the fuse box on the driver's side of the engine compartment. You need to open the box cover and refer to the diagram to find the position marked with the fan symbol. There are three common issues: first, poor contact in the relay itself preventing the cooling fan from starting; second, oxidized terminals causing excessive contact resistance; and third, damaged control wiring leading to signal loss. After replacement, it's recommended to test both high and low-speed modes: the fan should run at low speed when the AC is turned on right after starting, and switch to full speed once the coolant temperature reaches the midpoint. Once, while helping a neighbor fix their car, I found a cracked socket and temporarily solved the issue by tightly inserting a copper wire.
