Part 1 How To Test The Blower Motor Switch Ford 4 0l How to test the blower motor resistor (ford 4.0l). how to test the a c heater blower motor (ford 4.0l). basics of troubleshooting the blower control switch. the blower motor switch takes the current from terminal number 2 and as you turn the knob from one speed to another, diverts it to another terminal. 1. disconnect the blower switch from its harness connector and turn the key to the on position (but no need to start the engine). note: all of the tests in this section are done on the blower switch's harness connector and not on the switch itself. the photo above shows the front view of the female metal terminals of the connector.
How To Test The Blower Motor Switch Ford 4 0l Alright, these are the test steps: 1. disconnect the blower motor from its two wire electrical harness connector. 2. connect one end of the fused jumper wire to the blower motor male spade terminal labeled with the number 1 (in the illustration). Received 913 likes on 756 posts. check fuse f22 under the dash. it supplies power to the mode selector switch and energizes the blower relay in the underhood fusebox in any position except off. when the relay is energized, power is delivered from f23 to one side of the blower motor, the speed switch is in the ground side of the circuit and. Received 913 likes on 756 posts. no, they have individual relays. check fuse f9 under the dash and verify it is passing power while the ignition switch is in run. it goes to your mode switch and is supposed to pass power to energize both relays when the switch is in any position except off. 2. switch is stuck. another symptom of a bad or failing blower motor switch is a switch that is stuck, or frequently gets stuck. if the switch or any of its contacts becomes damaged, this may cause the switch to jam, or get stuck when you trying to change the setting. in some cases, the switch may completely seize into one position, which will.
How To Test The Blower Motor Switch Ford 4 0l Received 913 likes on 756 posts. no, they have individual relays. check fuse f9 under the dash and verify it is passing power while the ignition switch is in run. it goes to your mode switch and is supposed to pass power to energize both relays when the switch is in any position except off. 2. switch is stuck. another symptom of a bad or failing blower motor switch is a switch that is stuck, or frequently gets stuck. if the switch or any of its contacts becomes damaged, this may cause the switch to jam, or get stuck when you trying to change the setting. in some cases, the switch may completely seize into one position, which will. If power is supplied to the blower motor through the speed switch and blower motor resistor: disconnect the electrical connector at the blower motor. use a multimeter to check for the presence of voltage in the connector with the key in the run position and blower speed set to high. you should see battery voltage (12 ). I have done some electrical troubleshooting twice in the past week. once when the ac was functioning and once when it was not. basic tests: the switches in the front work fine. switching from ac to different fan positions alter nothing when the ac is not working within the blower motor.
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