How do I know if my blower motor resistor is out?
Signs of a Bad Blower Motor Resistor
Loss of HVAC fan control (total or certain speeds) The fan only works on its highest speed setting. No air coming from vents. Intermittent or inconsistent fan speed.
Where is the heater resistor located?
The blower motor resistor is usually extremely easy to access, but the hard part can be positioning your body inside the car to remove the part. The resistor is at the bottom of the HVAC housing or just behind the glove compartment.
What does a car heater resistor do?
The blower motor resistor in your car is the part that is responsible for pushing air through the vents when using the air conditioner or heater. The blower motor resistor is constantly put under stress which can cause it to eventually fail.
Is there a fuse for blower resistor?
A fuse is often located on the resistor board. The fuse only protects the low and medium blower speeds. High speed will still work if the resistor fuse is blown.
What happens when blower motor resistor goes bad?
If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.
What causes blower motor resistor failure?
In most cases, a blower motor resistor fails due to corrosion or overheating. Sometimes, the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor.
How do you test a heater fan resistor?
Blower motor resistor test – YouTube
What causes a heater fan to stop working?
If little air is coming through the vents (hot or cold), then it could be because the blower motor for the fan or a switch or resistor that controls fan speed isn’t working. Another cause might be that the electronically controlled “blend doors” that direct air flow are stuck or broken.
Is there a fuse for the heater in my car?
Q: Is There a Fuse For The Heater In My Car? A: Your car’s heater does indeed have a fuse. You can check to see if the heater fuse is shot by looking inside your fuse box.
How do I know if my heater fuse is blown?
Do you know how to tell if the furnace fuse is broken? All you have to do is look at the metal bar. If the bar is broken, then the furnace fuse has been blown. If you need to know where to buy a new fuse for the furnace, you need to make sure to get the same wattage ratings as before.
What causes heater blower not working?
How do I test a blower motor resistor?
Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.
Will a blower motor work without the resistor?
Without any power, the motor won’t run. As a result, the blower fan stays still and silent, and no air blows out of the vents. There are instances where a bad resistor will prevent the current from reaching the blower motor altogether.
How long should a blower resistor last?
How long should a blower motor resistor last? While a blower motor resistor is built to last for the car’s lifespan, you can expect it to last for 10-15 years, but it’s possible for them to last longer or shorter depending on the climate, driving habits, and quality of the resistor.
What does a bad resistor do?
When a resistor fails, it usually gets charred or burns. As a result, it either stops conducting the electrical current/signal or does not resist the current flow.
Where is the heater fan fuse?
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.
How do you test a fan resistor?
How to test and replace your blower motor resistor – YouTube
Can a blown fuse cause no heat in car?
A car heater that’s not working can be caused by the following issues: Failing or blown blower motor. Failing or blown blower motor resistor or blower motor resistor module. Bad or blown blower motor fuse, connector, or wiring.
Where is the fuse for the heater?
Fuses. If your furnace has a fuse, it will probably be located in the control box with the blower. BIf you can’t locate it, the transformer may have burned up and will need to be replaced. Once you’ve located the fuse, check its wires to see if they’re broken or look for signs of discoloration or cloudiness.
Where is the heater fan fuse located?
GMC Terrain – BLOWER MOTOR FUSE LOCATION (2010 – 2017)
Is there a fuse for the heater blower?
What causes heater resistors to burn out?
How do you know if a resistor is bad?
A good resistor should test within its rated range. A bad resistor will either show infinite resistance or a measurement far higher than its rated resistance. In either case the resistor is no longer functioning properly.
How do you test a resistor?
How to Test a Resistor – YouTube