Does relay drain battery?
A failed ECM power relay can also cause a battery drain or dead battery. If the relay shorts it can leave power on to the computer, even when the vehicle is turned off. This will place a parasitic drain on the battery, which will eventually cause it to go dead.
Does a radiator fan need a relay?
Most parts stores carry toggle switches and/or push-pull switches that will handle anywhere from 30-60 amps, so that would work. If you’re using one of those thermostatically-controlled deals (or a low amp rated manual switch) you should use a relay.
How do I run a radiator fan directly to the battery?
Take the second jumper wire and connect one end of the jumper wire to the positive wire from the fan. Extend the other end of the jumper wire over to the positive terminal of the battery. When the wire touches the positive terminal of the battery, the fan should come on.
What does a cooling fan relay do in a car?
This type conducts current when open and when closed in two different circuits. The cooling fan relay essentially functions as the switch for the engine’s cooling fans; and is therefore an important electrical component of the vehicle’s cooling system.
Where does the cooling fan in the engine go?
The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. A main cooling fan for the radiator. A second fan for the condenser.
What to do if your fan relay is broken?
Replace the relay. Another simple relay test is to shake it. If you hear something rattling inside, the relay armature is probably broken. The armature closes when the coil is energized to route power to the fan motor. The armature is normally closed and is pulled open when energized.
Why does the radiator fan run all the time?
The radiator fan may run up to five minutes and sometimes longer. Unless there is an electrical issue, it may stay on all the time until it drains the battery. When the engine is running, the coolant circulates from the engine and flows to the radiator, where heat is dissipated.