Which relay is for radiator fan?
The fan relay is usually located near the bottom of the engine compartment on a metal frame member. The metal acts as a heat sink to keep the fan relay cool. So, unplug the connector at the relay and repeat the check for power. If you get power, you’ve got a bum relay.
How does a 4 wire relay work?
The difference between a 4 and 5 pin relay is that a 4 pin relay is used to control a single circuit, whereas a 5 pin relay switches power between two circuits. 4 pin relays use 2 pins (85 & 86) to control the coil and 2 pins (30 & 87) which switch power on a single circuit.
How can you tell if a fan relay is bad?
One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.
What kind of fan relay do I need for my car?
Common Automotive Fan Relays Above are a few of the typical relays you might find in an automotive application. The important part to keep in mind is how much current your fan system will draw. A single 10 inch fan can draw anywhere from 5-20amps! If you are using 2 fans watching the fuse size, relay and wiring capacity is even more important.
How do I switch between the center and low fan relays?
In the Center position no contact would be made to either side and both fans would be OFF. If you complete the circuit to the LOW relay side only the right hand fan will go ON. If you connnect to the HIGH side of the switch BOTH relays will be actuated and both fans will be ON.
Do I need a temperature controlled electric fan relay kit?
While you could just wire the electric fan to run all the time, hooking it up with an electric fan relay kit that is temperature controlled—or to use the fancy term for it, thermostatically controlled—is a much better idea. Our example for today’s “how to” lesson is MotorTrend tech center technician Christian Arriero’s 1974 Plymouth Duster.
Where does the positive wire go on a fan relay?
The positive wire coming from the electric fan will connect to one of two red wires on your relay while the negative wire needs to go to ground.