Blower motors also deteriorate over time and can need replacement depending on the age of the system. A build-up of dust and debris can clog the system and prevent proper motor fan function. However, it's most likely that the motor has blown a fuse.
You need to use a multimeter and check for continuity from end to end of each fuse. If you have continuity, it's good. If it's open/no continuity, it's bad.
Overheating is one of the most frequent occurrences that can render the blower motor inoperative. If the motor has overheated, it may shut itself down to prevent damage. You should keep your HVAC clean and clear of any blockages or debris to avoid overheating and maintain efficiency.
First see if a new fuse blows with the blower unplugged. If it does then there is a short between the fuse and the blower and the wire harness will need to be inspected to see where the short is. If the fuse does not blow with the motor unplugged the motor is shorted and needs to be replaced.
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.
In AC systems, the air conditioner reset button is on the outside unit's lower edge, typically close to the ground. Some models have the reset button located behind the service panel, which may require tools to remove.
If your AC fuse is blown, it's most likely that your air conditioner will stop functioning entirely. Or, it will keep the blower running, but every other component will stop working. Of course, there could be other problems that make your AC stop working. So, how do you tell for sure whether your AC fuse is blown?
The replacement of the blower motor is common and straightforward, so most shops will perform the repair — many on the same day.
More specifically, systems that include blower motors have a lifespan of roughly: Air-Source Heat Pumps: 10 to 12 years, with a maximum of 15 years or more. Furnaces: 10 to 20 years, depending on maintenance schedules. DX Air Conditioners: 15 to 20 years, depending on maintenance schedules and manufacturer quality.
You may need to clean, repair, or replace the connector or wiring. Faulty HVAC Control Module: The HVAC control module is the computer that controls the HVAC system. If it's failing, it can cause the blower motor to stop working. You may need to replace the HVAC control module.
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.
On some platforms, a faulty blower motor relay will cause the blower not to work at all, which means there will be no airflow from the A/C. On others, the blower won't work on “high blow” but all the other speeds will work. The blower motor relay fails because it regularly deals with high current loads.
The most common reason why your blower motor won't work on any speed is that you have a bad or blown a fuse. The most common reason why your blower motor won't work on any speed is that you have a bad or blown a fuse.
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 the fan doesn't work, before pointing the finger at the blower motor, check fuses for the motor to make sure they're still good. Many vehicles have two fuses for the blower motor, one in the interior fuse block and the other under the hood. The blower motor is usually under the dashboard on the passenger side.
In most newer systems, the button is often directly next to the blower motor, while in older systems, it may be harder to spot as it is sometimes underneath or behind the motor. The reset button is often made of yellow or red plastic and marked with a large “R ” to make it easier to spot.
The AC system is responsible for circulating air through the system and into your home. Therefore, if you notice that there is low or no airflow from your vents, it's an indication there may be a problem with your blower motor that needs repair or replacement by a professional.
You can find it on the wall beside the unit or at the condenser. The isolation switch looks like an ordinary light switch with a knob. Once you locate it, turn the knob to the off position and leave it for at least 30 minutes up to an hour. This will allow the electrically operated components in the AC to reset.
An outside AC fan not spinning could be caused by power supply issues, a faulty capacitor, a burnt out motor, contactor issues, wiring problems, debris or obstruction, a faulty thermostat or control board, or frozen evaporator coils. Contact your local Carrier dealer to help troubleshoot the issue further.
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.