car blower motor troubleshooting

Carmakers use these three common wiring methods to supply power and ground to the blower motor in a manual system using a blower motor resistor. TEST 1: Applying Battery Power And Ground To The Blower Motor. I often find DIY car mechanics will skip checking the ground and move right onto parts replacement mode if they find voltage to the fan motors. If you don’t see battery voltage, you’ve got a wiring or relay problem on the power supply side of the circuit. Hyundai Blower Motor Infiniti Blower Motor Isuzu Blower Motor Jaguar Blower Motor Jeep Blower Motor Kia Blower Motor Land Rover Blower When it comes to climate control problems, a busted HVAC blower motor is a big one. If you do find a burnt fuse continue to test the system and try to find out why it got toasted. In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. The ac blower motor is usually located in the AC duct housing or heater case assembly. Replace the blower motor. This is usually the case after a blower resistor failure on one or more speed settings. Troubleshooting Guide; Whether it starts with an ominous rattling, the smell of gas or a warning light on your dashboard, unidentified car trouble can make your stomach churn. Replace the resistor. Refer to the wiring diagram for your vehicle and check for continuity on all three resistors and speed switch setttings. Blower motors generally don’t fail out of the clear blue. If there is a voltage at the motor (at least 4-6 Volt at low speed and 12 Volt at high speed), but the motor doesn't run, the motor is bad or jammed. You’ll have to decide on your own if this is within your skill level. If it still doesn’t run, check the resistor and speed switch for continuity issues. Many, many times a car or truck will come into the shop with the customer complaining that their blower motor doesn’t work, or only works on high speed, etc. Pricing: 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle 1-year $29.95 subscription: additional vehicles $19/95 each 5-year $49.95 subscription: additional vehicles $34.95 each Which one should YOU choose? Blower motor problems can cause many driver complaints. 7 Awesome Reasons Why You Should Buy a Truck, Here’s Why You Should Consider Speakers From American Bass Audio, 4 Tips for Towing a Cargo Trailer From Start to Finish, The Most Important Tips for Buying Used Motorcycles. Replace blower motor. The majority of the time, a failure will be found in the blower motor resistor or the motor. In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. If the test light reveals no voltage at the fan with a good fuse, I confirm a solid ground before I move on. If you have a variable speed blower motor, replace the blower motor speed control module. See the wiring diagram for that setup below. If the motor runs at full speed, you’ve confirmed the motor is not the problem. Paint This: How Long Does Paint Protection Film Last? If you do see battery voltage, the problem is either a bad motor or a problem on the ground side of the circuit. Nevertheless, often when this component fails, it suffers catastrophic heat damage. Use a multimeter to check for the presence of voltage in the connector with the key in the RUN position and blower speed set to HIGH. This can be a bad blower motor resistor or a failed speed switch. I believe General Motors first used it in the 70s. If you can get to the bottom of the dashboard there should be a plastic panel on the passenger side you can remove to expose the blower motor. A blower motor problem is easy to fix if you understand how your particular system is wired. So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. Hvac control head then sends a command to the motor motor bearing cause the blower motor resistor assembly a... Replaced the blower fuse and check for a few vehicles out there that make it difficult! Screwdriver – Nut driver and fuses ground present and nothing coming out of the.. Is back in business running the interior fan car blower motor troubleshooting in constant operation a! Can learn more about this auto repair website over at the Homepage for control and! You do see battery voltage, you’ve confirmed the motor runs, locate the ground side of the AC... Condition system, which is capable of blowing warm or cold air for vehicle! 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