18
Apr
When testing a resistor the multimeter is passing a known amount of electrical current through the resistor and then measuring the amount of current that actually makes it through. Test the connector for power at the terminals in the connector using the voltmeter.
OK lets get started.
How to test a blower resistor. Here are some tips on how to test a blower motor resistor. Start by looking for the blower fan resistor. A repair manual can tell you where its location is in your vehicles make and model.
Place the other lead on terminal 2 and check against specifications. If this circuit is open showing infinity on the. Move the lead from terminal 2 to terminal 3 and check this reading against.
Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open showing infinity on the Ohmmeter the blower resistor must be replaced.
Move the lead from terminal 2 to terminal 3 and check this reading against specifications. OK these are the test steps. 1Disconnect the blower resistor from its harness connector and set your multimeter to Volts DC mode.
2Turn the key to the on position and set the blower speed knob to LO. Test for power at all the blower speeds by moving the blower speed switch through all positions. A faulty resistor loses power at different positions on the switch.
OK lets get started. 1Disconnect the blower motor resistor from its connector and remove it from its location. 2Visually inspect the blower motor resistor block and connector for burn damage and severe corrosion.
The blower resistor passed all of the continuity tests indicated above. This is good and is the correct and expected test result that tells you that the blower motor resistor is OK and not the cause of the blower motor speed problem. You have eliminated the blower resistor as bad on your Ford Explorer Ranger Mercury Mountaineer.
Remove power from the circuit containing the resistor. This can be done by unplugging it from the mains or by. Isolate the resistor from the circuit.
An attempt to measure a resistor that is still connected to the circuit can. If the resistor shows signs of. OK lets get started.
1Disconnect the blower motor resistor from its connector and remove it from its location. 2Visually inspect the blower motor resistor block and connector for burn damage and severe corrosion. Sometimes a blower motor resistor might fail due to problems with the blower motor itself.
This means after replacing the blower motor resistor check if the blower motor runs freely and doesnt make any noise. We have seen instances where a worn-out blower motor causes a recently replaced resistor to fail again. You test the resistor block using an electrical multi-meter set to the Ohms scale.
Using the meters test leads check the following. Between terminals 2 3 you should have 23 ohms resistance. When testing a resistor the multimeter is passing a known amount of electrical current through the resistor and then measuring the amount of current that actually makes it through.
Test the connector for power at the terminals in the connector using the voltmeter. If there is power reinstall the connector to the resister. If there is no power at the connector there is a problem with the console on the dash and the console should be replaced.
Remove the wire connector that can be seen at the blower motor itself. The blower resistor is connected in series with the blower fan. This means that the current running through the blower motor and thus is speed is controlled by the resistor value.
The user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor pack. The blower motor resistor is an electrical component that is a part of the vehicles heating and air conditioning system. It is responsible for controlling the blower motors fan speed.