All electrical devices contain circuits that channel current to perform various tasks. Ok these are the test steps.
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As youre already aware your pickups heater control panel gives you the option of 4 different blower motor speeds.
How to check heater blower resistor. Attach the clip lead of the test light to a good ground like a bolt screwed into metal and touch the sharp probe end to the terminals on the fuse. Jerry heasley recommended for you. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.
How to test vehicle acheat blower motor. The reduction in blower fan speed is accomplished thru resistors inside the blower resistor assembly. 1967 shelby gt500 barn find and appraisal that buyer uses to pay widow price revealed duration.
In the highest speed state the blower resistor is bypassed completely and the fan is connected directly to the cars battery which allows maximum current through the motor. To limit the amount of electrical current flowing through a part of a circuit engineers use resistors. Basics of troubleshooting the blower motor resistor.
2 visually inspect the condition of the blower resistors coils and its electrical connector. Place one lead of the ohmmeter on terminal 1 of the resistor. If this circuit is open showing infinity on the ohmmeter the blower resistor must be replaced.
Blower motor does not work on certain settings. Test the fuse with the ignition key on using the 12 volt test light. When your blower motor goes bad you will not get ac or heat to blow inside of your vehicle you will also not be able to defrost your windows.
The more ohms of resistance a resistor has the less current is. If the resistor shorts or fails it may cause the blower motor to remain stuck on one fan speed. 3 probe terminals 2 and 1 with your multimeter test leads see image above.
Locate the fuse for the blower motor in the ownersservice manual. 1 disconnect the blower motor resistor from its electrical connector and remove it. Sometimes a blower motor resistor might fail due to problems with the blower motor itself.
The effectiveness of a given resistor is measured in ohms. The lower the resistance of the selected resistor in a pack the higher the current that flows through the blower fan and the faster the fan will turn. Place the other lead on terminal 2 and check against specifications.
The heating and air conditioning systems may still function at one speed however the resistor will have to be replaced in order for full functionality to be restored. We have seen instances where a worn out blower motor causes a recently replaced resistor to fail again. Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings.
This means after replacing the blower motor resistor check if the blower motor runs freely and doesnt make any noise.
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