How to tell if a blower motor relay is bad?

How to tell if a blower motor relay is bad?

Symptoms of a bad heater blower motor resistor

1. Fan does not work at all, so no air comes out of the vents.
2. Fan only works on some speeds and not others.
3. Fan only works on the highest speed.
4. Fan runs all the time and can’t be controlled with the fan switch.
5. You see smoke coming out of the vents.

Can a bad blower motor cause fuse to blow?

If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.

What are the relays on a John Deere blower motor?

You should have three fuses and one relay controlling the fans. Fuses F05/1, F05/13, and F05/14 all provide power to the blower motor circuit. The K10/1 relay is the primary relay.

What causes a blower motor relay to wear out?

Essentially an on/off switch, the blower motor relay’s reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor. Blower motor relays tend to wear out over time from the stress of constantly flicking back-and-forth.

What causes a fuse to blow on a blower motor?

How to test the blower motor on a John Deere?

You will see both blower motors and the fan speed resistor once you have the cover off. Turn the key to run and the blowers on low and give each blower a spin to see if it reacts. You can test for power input and output at the blower motor resistor. Please let me know if I can be of any further assistance. Thanks, Kevin

You should have three fuses and one relay controlling the fans. Fuses F05/1, F05/13, and F05/14 all provide power to the blower motor circuit. The K10/1 relay is the primary relay.

What causes a bad or failing blower motor relay?

Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current…

If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.

You will see both blower motors and the fan speed resistor once you have the cover off. Turn the key to run and the blowers on low and give each blower a spin to see if it reacts. You can test for power input and output at the blower motor resistor. Please let me know if I can be of any further assistance. Thanks, Kevin