![]() Remove the cover from the top of the underhood fuse/relay box. The box is typically located on either the driver or passenger side of the engine compartment near the fender. Visually identify the underhood fuse/relay box. Method 1 of 2: Removing the cooling fan relay in the underhood fuse/relay box If at any point it is not possible to avoid contact with the radiator fan assembly, it is recommended to disconnect the battery in order to render the radiator fan inoperable. Keep area around the fan blade clear in order to avoid injury. Warning: It is possible for the radiator cooling fan to operate with the ignition key in the “off” position. Note: Some manufacturers will also refer to the electronic control module (ECM) as a powertrain control module (PCM). To replace the cooling fan relay, there are two methods that we will cover for the positions mentioned above. The cooling fan relay is normally located in either the underhood fuse and relay center or mounted to the electric fan assembly behind the radiator. ![]() When the cooling fan relay gets its signal from the ECM, the wiring diagram will typically resemble the following illustration. ![]() This type of relay system also allows for use of smaller diameter wiring that takes up less room throughout the vehicle and can save considerable weight on today’s increasingly computer controlled systems. When the fan relay does not work, then the proper signal will not be received and the fan cannot cool the system down. By using a lower voltage signal to control the relay, there is less stress on the rest of the wiring and charging system. The cooling fan relay takes the low voltage signal and internally switches the relay “on” to allow battery voltage to be supplied to the radiator cooling fan. The function of the cooling fan relay is to convert a low voltage signal from either the electronic control module (ECM) or a thermostatically controlled sensor. A cooling fan relay is used on vehicles that have an electrical fan to cool the engine.
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