1998 Honda Accord Lx Blower Resistor Pin Diagram

The heater blower motor resistor is an electrical component that is located between your car's ventilation fan (or blower) and its power source. When you adjust the fan, the heater blower motor resistor allows the fan to run at several different speeds. Each of your car's fan speed settings allows a different amount of power to reach the fan: the more power that reaches the fan, the higher the fan speed. The highest fan speed usually bypasses the heater blower motor resistor, allowing full power to reach the fan for maximum airflow. The fan's "off" setting disconnects the power.

In manual heating and air conditioning systems, the heater blower motor resistor is connected to the dashboard fan switch, which is directly controlled by the driver. Automatic climate control systems will usually adjust the fan speed based on what is needed to reach the selected temperature set in the climate control computer.

In older cars, the heater blower motor resistor was mounted under the hood on the firewall. Today's modern vehicles normally locate the heater blower motor resistor inside a ventilation duct near the fan, where the built-up heat from the operation of the heater blower motor resistor can be dissipated. Newer vehicles with advanced computer-controlled climate systems may package the heater blower motor resistor (or the equivalent functionality) within their microelectronic "brains."

Symptoms of a bad heater blower motor resistor

A problem with your heater blower motor resistor can be a serious issue. Because your heater blower motor resistor is part of your car's climate control system, your ability to keep air circulating within your vehicle can be affected.

If you can't defrost your windshield, or warm up or cool down your car, a bad heater blower motor resistor can make it difficult to drive safely or comfortably. Many factors can cause a bad heater blower motor resistor. Here are some of the warning signs of a bad heater blower motor resistor:

• Fan does not work at all, so no air comes out of the vents
• Fan only works on some speeds and not others
• Fan only works on the highest speed
• Fan runs all the time and can't be controlled with the fan switch
• You see smoke coming out of the vents
• You smell something burning coming from the vents

Repairing a bad heater blower motor resistor

The heater blower motor resistor in your car leads a hard life. It must handle not only the power demands of the fan when you are driving, but it also has to absorb and dissipate tremendous amounts of heat as a byproduct of its normal operation. Over time, the heater blower motor resistor can wear out from a variety of causes. These include overheating, corrosion, vibration, excessive electrical current flow from a bad fan, and exposure to water.

Your mechanic will thoroughly inspect the electrical components and connections that support your fan's operation. Because the heater blower motor resistor does eventually need replacement in many vehicles, it is usually placed where it is easily accessible to your mechanic. A replacement part should restore the system's functionality. If your car's fan speed control resides within a climate control computer unit, the repair will be more complex – and expensive.

It is important that a thorough troubleshooting process be performed to be certain that the heater blower motor resistor is the cause of the problem. Doing this will enable your mechanic to repair or replace only what is actually defective, while not missing anything else that needs attention. In instances where the fan is totally non-functional, for example, the problem could actually be a blown fuse or a bad fan – or both!

Repairing it by yourself can be tricky

Unless you have had extensive experience in working with automotive electrical systems, leave this to the professionals! The process of troubleshooting the entire electrical system around the heater blower motor resistor will assure that only the parts of the system that are actually bad get replaced. And that can save you money!

These fan systems are fairly simple if they are manually controlled. But if you have to troubleshoot electronic computer modules, it will get very complicated, very fast! Your mechanic has the experience and the right diagnostic equipment to replace your heater blower motor resistor correctly and cost-effectively.

Source: https://repairpal.com/heater-blower-motor-resistor

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