Problems to Expect from a Volkswagen Jetta Blower Motor Resistor
When the heating and air-conditioning system of your vehicle goes bad, there are a lot of things that may have gone wrong. You should consider taking a look at your car's blower motor resistor. If the problem doesn't seem to be related to any other parts and your blower motor seems to be completely fine, the electrical system may be suspect, and the blower motor resistor is a part of that problem. Right here are the common problems you may possibly meet:
The blower motor resistor is a small piece of equipment that provides power to itself. A blower motor resistor is equipped with a small circuit board for this purpose. Over time, however, this circuit board has a tendency to become brittle and fragile. The constant heating and cooling may affect it, and it may eventually break. If this happens, the blower motor resistor will cease to work, and at the same time, will stop to deliver air through your car's A/C system vents.
Any electrical system can fall prey to building electrical resistance. Your blower motor resistor is included, and may make your vehicle's A/C system have problems. If it builds up too much resistance, this may cause it to falter while working, or not work at all. This condition may also affect the fan. It may bear upon the fan's speed, setting it at a constant and maintaining it at that speed, no matter what setting you place it on.
You can know that your blower resistor is bad simply by testing your vehicle's A/C system at different speeds. Higher speeds draw power directly from the switch, so you may notice no difference when you set it at high-speed. However, if you notice that there are no power coming from setting it at a lower speed, then you have a problem. The lower and mid range speed settings all draw power from your car's blower motor resistor.
As always, test the connections
Being an electrical unit, the blower motor resistor can benefit from having most of its connections tested. Sometimes, bad connections can weigh heavily on the blower resistor, since it uses electricity to run itself. Test your connections to see if it is really the problem, or if the blower resistor has turned bad.