Car Heater Fan Not Working Properly

This can be as simple as a blown fuse or it could be more involved. In most cases a blower motor resistor fails due to corrosion or overheating.

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A problem with the switch which turns the fan on or off might also be the source of the problem.

Car heater fan not working properly. The blower fan. As hot coolant is drawn into the heater core the heater fan controlled by the HVAC controls blows that heat into the cabin as the cooled coolant returns back to the system. There is a fan speed controller that sits just outside of the heater box that sounds like it has gone bad but to know for sure test the power wire headed to the blower fan when it is not working.

Check in the connector plugs for any signs of corrosion. Check for any damage and clean the connector. Problems with the heater core.

If you do not have power going to the fan then suspect the module if there is power then the blower motor has gone bad. A faulty engine fan might run all the time causing the cooling fluid to stay at a low temperature all the time. The only fault that is likely to develop is that the fan stops working because of a break in the electrical circuit.

If the problem of the radiator fan not working still persists you can check the fan by connecting a different power source to it that is direct battery power. Cold coolant fluid will not generate the required heat needed by the heating system and therefore your car heating will not work properly. Also check the connector plugs at the relay and control unit.

Average failure mileage is 55800 miles. First unplug the wiring connector. The best setting for diagnosis is fresh air not recirculated with the air blowing out of the center vents in the dash and the AC turned.

Turn the air conditioning on while the car is running. When troubleshooting to try and repair the car heater check the coolant ONLY when the. Check the wirings going to the radiator fan from the control unit or relay.

If the fan is not working even when the car is overheating there might be a wiring issue or a bad connection. You can check to see if the fuse is blown and replace it but a mechanic will likely need to intervene if its more. In some cars a failed blower motor resistor can cause a heater fan to stop working completely.

Check for blown fuses and replace them to restore normal functionality. The 2006 Chevrolet Silverado has 5 problems reported for heater fan not working properly. When a car heater doesnt work the most common cause is low coolant.

A blown fuse might just be the reason your car heater fan is not working. The motor is usually earthed to the body by a separate wire. Hi I am saourav kumar from INDIAIn this video I will help you out to solve your cars bad radiator fan overheating engines during summerTataIndigoR.

If the cars blower fan isnt working you wont get enough heated or cooled air onto the windshield to defrost it. This circuit consists of a feed wire from the fusebox to the onoff switch on the dashboard or centre console and another wire from the switch to the heater motor. So its advisable that you get the switch checked too.

Sometimes the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor. By Eduardo Ruelas on January 08 2016 1. The air conditioner wont run properly unless your engine is running.

Another reason why your car AC fan is not working could be due to your cabin air filter. Cabin air filters serve as a filter to the outside air coming into your car to make sure it. Symptoms of a Bad or Failing Heater Blower Motor Resistor Common signs include the cars heater not working or getting stuck on a certain speed or something getting jammed in the blower motor.

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