How to tell if a blower motor is bad

YourMechanic, to determine if the . The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. Discrepancies in the electric circuit for the blower, such as bad control switches or resistors, can halt all function, or prevent operation at certain speed settings.

Smoke originating from the vent registers, or from under the dash, can be signs of catastrophic blower motor breakdowns.

There are several symptoms that appear when the resistor of the blower motor is going bad.

Service Clinic: Why and How to Test HVAC Blower Motors.

Or, it could be that the motor. I checked the voltage going to the blower motor and it is at 14. How to tell if you have bad bearings on blower motor tutorial.

Automotive engineers use blower motors to force heated or cooled air through the interior of the vehicle to adjust interior temperatures.

If your blower motor does not operate as designe your vehicle is likely not very comfortable to drive. With some very simple tests, it is possible to determine if the problem is with the blower . If any of the electrical contacts on the inside of the switch wears out or breaks, then the switch may be disabled in that position and that particular setting for the blower . Bad filter blocks blower motor Air flow! A simple method to determine if the capacitor on your blower motor has gone bad . Find out how to use one relay to test another with help from an ASE- certified mechanic in this free video on troubleshooting car problems. If you have power and ground replace the fan control amp.

To check the feedback circuit disconnect the HVAC module and check terminal for 12v Key On Engine Off or Running.

A number of events can lead to this problem, from those that are simple to fix to complicated mechanical repairs or replacements. If you leave the blower motor switched continually on you may not notice this. What could be the reason it keeps going bad ? Even if an HVAC system is providing adequate amounts of cooled or heated air, the system will not be effective if the air is not moved throughout the building.

How to Test Motor Start and Motor Run AC Capacitor of ac fan and compressor - Duration: 8:07.

Video for Licensed HVAC Professionals ONLY, Please do NOT attempt any Procedures without Professio. I was tempted to knock on their door to tell them people gotta sleep. Good Video, and yes, I too wish you had shown us how to remove and replace the blower motor.

Veteran- Owned heating and air conditioning company, and pride ourselves on giving. If you are able to determine that hot antifreeze is flowing through your heater core, then you may be dealing with debris in the heater box – typically in the form of . They work with the compressor, the blower motor , and the outside fan in your air conditioner. Checking Your Air Conditioning Capacitor. Finally, if your motor is showing signs of rust it means water is getting into your blower box and you need to clean out any debris stuck in the box and clean the cowl .