Yes, a blower motor can work without the resistor, but it will only operate at its maximum speed.
An essential electrical part of an automobile's heating, ventilation, and air conditioning (HVAC) system is the blower motor resistor. Usually, it's a compact, rectangular device with many resistors of varying resistance integrated into it.
As we know, the resistor is responsible for controlling the blower motor's speed by regulating the voltage supplied to it. It will turn out that without the resistor, the blower motor may run at maximum speed or not function as expected.
Bypass. This can be done by running a wire from somewhere like your fuse box and attaching it to the + of the coil. If it's a ceramic type, see attached pic for easy way to do this. It leaves all factory wires in place so it's easy to convert back and makes it obvious to future mechanics that the resistor is bypassed.
Replace the resistor with a wire. That means basically no resistance and much more current flow in the close-by components. Even though I don't see components that could be affected by overcurrent, it's still something I'd do as a last resort. Replace the resistor with a fuse.
(1) Put the clip to the starting point of your strip(i.e. on the most lefthand side). (3) Next to this clip, put another clip,leaving a space of around 1/2 to 1 cm. (4) Connect your multimeter probes to the clip and check the resistnance. (5) Adjust the position of the second clip to get the desired resistance.
Introducing the Blower Motor Resistor Bypass Kit, the ultimate solution to fixing a faulty blower motor resistor in your vehicle. This innovative product allows you to bypass the resistor entirely, providing a direct connection to the blower motor for maximum efficiency and power.
Most AC units have a blower motor reset button on the AC unit outside or near the blower motor itself. This button is usually a small red or black button. If your AC unit has a blower motor reset button, press it and hold it for a few seconds.
In practice, for a large capacitance and/or small resistance, there could be enough heat to melt the wire, or even cause sparks or explosions (don't try it at home!) The energy has to go somewhere- it could go into heat, light, or mechanical energy.
One of the most common resistor failures is overheating, which can lead to burnout. This occurs when the resistor is subjected to a current or voltage exceeding its rated capacity. Overheating can cause the resistor to char, crack, or even melt, rendering it non-functional.
Blower motor resistors have several resistors with different resistances. This controls the current that runs through the blower motor. Each fan speed selection is connected to one or more of the resistors in the blower resistor assembly.
Resistors most often fail open, not closed as in a short circuit. So if you just wanna take a quick and dirty look, you can place a resistance meter across the component and you should get the resistor's rated value OR LESS.
While a fan stuck on high is the most common indicator, a complete loss of fan function on all settings can also point to a failed resistor. In some cases, the entire component can fail catastrophically, often due to a significant electrical surge or extreme heat.
Resistors don't really degrade with age, at least not to a level where it matters for hobby electronics. But if they haven't been stored properly they are likely not suitable for hot air reflow assembly, due to moisture absorption.
When you're ready to make your repair, you can find a new blower motor resistor, blower motor, cabin air filter, and much more at O'Reilly Auto Parts.
The most likely reasons for blower motor resistor failure include: Corrosion from long exposure to air and moisture. Overheating—if a motor finds it harder to move because of jamming or worn bearings, it can raise the resistor's temperatures to dangerous levels. Normal wear due to time and use.
After the blower resistor is broken the airflow control knob loses its speed control function, which will cause the airflow to not be adjusted. The blower motor only runs at some speeds, not all.
In this case, we see the resistor value by a multimeter and try to compare it to its actual value. If the measured multimeter value matches the given actual value of the resistor we say the resistor is good, else you have a bad resistor.
The traditional blower motor resistor is connected to ground, and wired in series with the blower motor assembly.