Make sure that the power cord hasn't melted or a fuse hasn't been blown. If your cables are looking fine, try unplugging the fan for a few minutes and then plugging it back in again. Sometimes, this process can reset the motor and solve your furnace problems.
The most common reason why your blower motor won't work on any speed is that you have a bad or blown a fuse. A fuse is a small wire inside of a connector that is used to protect the motor itself from a surge of electricity.
After you find a good ground for the negative lead, turn the blower motor switch on to at least 1, then back-probe the yellow wire on the blower motor's connector. You should see 12V. Now, if you see 12V when you do this, then that means you have power, but you don't have ground.
Either it's not getting electrical power or, more likely, the motor itself has simply burned out. A blower motor in an older vehicle is likely to burn out over time, and may need replacement.
Yes, a blown fuse can cause a car heater not to work. The car's heating system relies on various electrical components, including the blower motor, which circulates air through the heater core.
The average cost for a Blower Motor Resistor Replacement is between $119 and $154. Labor costs are estimated between $43 and $54 while parts are priced between $76 and $99. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.
Symptoms of a Bad Blower Motor Relay
On platforms where the blower is directly controlled by the switch rather than a module, the relay will cause the blower not to work at all, which means there will be no airflow across the evaporator, and the effect will be the same as the A/C not working at all.
The thermostat is what tells these separate systems to work together. In normal operation, when your thermostat is set to "auto," it will tell the blower fan plus the heating or cooling components to turn on and off at the same time when the desired temperature is reached.
Replacing a furnace blower motor costs $560, on average. Depending on the size and type of motor, most people pay $300 to $900. The average blower motor replacement cost is $560, but the final price depends on labor fees, as well as the cost of the parts.
You can test this by jumping out 120 volts to the blower motor wires; this will let you know if the blower motor works or not. 2. Ensure the capacitor attached to it is good – whether you do it before you jump out the blower motor or not, quickly check the capacitor to see if it meets manufacturer specs.
If your heater blower motor not working or heater fan motor not working, check for signs of wear and tear on the motor, belts, or bearings. Mechanical failures often result from years of operation without proper maintenance. A motor replacement or repair may be necessary to restore function.
Blower motor is fuse 35 and is a 40 amp. You could test them with a meter or visually look to see if they're blown, then take it to a shop if they blow after replacing them.
If the cooling fan relay has failed, you may see warnings, such as the check engine light and the temperature warning light, pop up on the dash, but first, you may notice that the A/C stops cooling. More about that in the next paragraph. The check engine light illuminating may indicate a faulty cooling fan relay.
A Failed Motor
An HVAC blower motor will occasionally fail due to age, wearing out, or not being cleaned regularly. Symptoms may include strange noises, burning smells, or just plain refusing to turn on. If this happens and the motor is no longer operable, a new blower motor may be needed.
Check for Electrical Issues: Begin by inspecting your electrical system. Check for blown fuses in the furnace circuit or a tripped circuit breaker in your electrical panel. If you find any, replace the blown fuse or reset the breaker to see if this restores power to the blower motor.
Some of the reasons a blower motor might fail are overheating, and excessive moisture. When dust, dirt, and debris build up, it can cause the windings and bearings to burn up more quickly.
Blower Motor Resistor Test
Typically, if the fan will work on some speeds but not on others, the resistor is suspect. Okay, let's say there's no melting going on, but your fan doesn't work on all speeds. Typically, if the fan will work on some speeds but not on others, the resistor is suspect.
If your blower fan isn't working correctly it may be because the fan resistor needs to be replaced. A replacement may cost you from $65 and go up to $375 or more, depending on your vehicle.
Normal wear and tear: Like all mechanical and electrical components, blower motor resistors wear out over time. Repeated heating and cooling cycles and the mechanical stress associated with adjusting fan speeds can cause it to gradually degrade.