If you don’t see battery voltage, you’ve got a wiring or relay problem on the power supply side of the circuit. Many, many times a car or truck will come into the shop with the customer complaining that their blower motor doesnât work, or only works on high speed, etc. Hope this â¦ If If you are in the market for a used Oldsmobile vehicle, it may be that you have considered a Certified Pre-Owned, or CPO, vehicle. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Honda alternator and charging systems explained, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. I have a 2003 f-350 that the blower motor only works on high, meaning that when the selector is in any other position it does not turn on but once in high it blows on high speed. You may have a blown main fuse if the alternator is proven to be... Electric seats run on a track with motors that adjust it in the direction you choose. Hi There, 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. So you may have high speed, but no lower speeds. Also, sometimes a blower motor relay on your control board might be going bad and you might need a new control board. Or, carmakers can opt for a motor resistor AND a high speed relay. Based on the driver’s input to the blower speed switch, the HVAC control head sends a digital signal to the blower motor speed control module. See the wiring diagram for that setup below. I have checked fuses, replaced the resistor, and I have replaced the relay with no effect. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. Here are the blower motor fix steps: Determine if you have a manual or automatic heating system in your vehicle? Blower â¦ Also, does your blower motor have just a 3 or 4 speeds or do you have a variable speed motor where you vary the speed by turning a dial? is not expensive and easy to replace. High blower speed is run threw a high blower motor relay and fuse. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. Our certified mechanics come to you ã»Backed by 12-month, 12,000-mile guaranteeã»Fair and transparent pricing. Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. My car has an automatic transmission. When this happens, you may notice that you will not feel anything blowing out of the vents at all. This is a very common problem among many cars and all makes of stereos. However, there is a technical service bulletin (TSB) that may pertain to your issue. Pricing: ---Eautorepair.net--- 1 month subscription $19.95 per vehicle 1-year subscription $29.95 per vehicle 4-year subscription $44.95 per vehicle ---Alldatadiy.com--- 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? In the end, I had to solder all of the wires directly on to the resistor because you can not buy a replacement plug. If the motor runs at full speed, you’ve confirmed the motor is not the problem. I read in the forums that the resistor pack is messed up. Please see our. In those applications, the motor resistor reduces power for the slower speeds and the blower motor has a permanent ground connection to complete the circuit. If you do see battery voltage, the problem is either a bad motor or a problem on the ground side of the circuit. It is likely NOT the blower motor itself. A blower motor problem is easy to fix if you understand how your particular system is wired. Blower motor is drawing too much power. If it’s good, refer to a wiring diagram for your vehicle and conduct these tests: Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. no high speed Does this mean that the selector switch is bad or is there seperate windings for each speed? If it runs, you’ve solved the problem. Why do you need to know that? There are also two additional circuits used for the off state of operation as well as the highest speed of operation. They include wiring diagrams and technical service bulletins. You may just be able to wiggle the plug. I'd recommend disconnecting blower motor and check to see if yellow/blue wire is being grounded with switch on high if so replace blower motor. The Oldsmobile Oil Life System indicates when and what service your car needs. You need to have the charging system checked to see if the alternator is charging the battery. Since I had purchased an extended warranty, I took it to the local Monaco dealer to have the blower speed fixed along with other problems. Car symbols, or dashboard lights, are a car service reminder. Blower on high not working. Neither of those things fixed the problem. The control head then sends a command to the motor controller to change the speed to the driver’s preferences. I initially thought the switch was bad so I replaced it, but I still don't have high speed on the blower. Replaced blower motor and it ran OK then ran at high speed without the select switch being on. You can test them with an ohm meter. P0128 code definition Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) What the P0128 code means The P0128 code means that the... Oldsmobile Certified Pre-Owned (CPO) Car Program, Understanding the Oldsmobile Oil Life System and Service Indicator Lights, P0128 OBD-II Trouble Code: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). Itâll be located on/in the ductwork by the blower motor. Hi Bimmerfest friends, My problem is that the blower motor doesn't pump more air if it is set to driver and passenger vents, whether it is AC or heat, (it just works/fan accelerates when speed setting is 1 and 2 = very low air speed, higher fan speed seems to be ignored by the blower motor). Keeping the black lead on a good ground, usually a bolt on the engine block, and the blower switch turned on, use the red lead to probe the plug that usually attaches to the blower motor. Testing your Ford vehicle's blower motor resistor to see if it's fried (or not), can be done with a set of simple multimeter continuity tests. 2. I would suggest getting a mechanic, such as one from YourMechanic,... Hi. Start by checking the blower fuse and HVAC controller fuse. Had 2 occasions when the blower motor just started running on high â¦ 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. I am competent on all aspects of working â¦ Some Blower Motor Fan Speeds Not Working This one has been a big issue over the years. The resistor is what controls the speed of the blower motor, not the relay. If you get a good ground reading, the problem is most likely a bad motor. Check for full airflow at the vents. The first thing to go is high speed. With the connector off the blower motor and a test light attached, power is present in all positions except high. There is a plug that plugs straight in from the bottom to the resistor. One trick that I have seen work before is hitting the reset button which is a small hole about the size of a pen head under... Hi, it sounds like you may have a injector that is shorted to ground or an injector cable that is shorted. Also look for any burnt or melted connectors, they must be replaced or you will not get the blower working. Check the cabin air filter for clogging. See the wiring diagram for that setup below. In the off state, the blower motor is effectively disconnected from the power supply. Roy . The reduction in blower fan speed is accomplished thru' resistors (inside the blower resistor assembly). A Haynes repair manual will show you where it is. Power seems to drop both to the fan and AC switch when set to high. Or, carmakers can supply power to the motor and control blower speeds on the ground side of the circuit. The blower resistor is connected in series to the blower fan motor. I remember in older model years of gmc's and chevys that their was a high speed blower relay that caused this issue. The most common causes include: low fluid level, shift solenoids, torque converter, or the transmission linkage. There are several signs that you can look for to tell if your blower motor might be on its way outâfor instance, if your HVAC blower does not operate at different speed settings or doesn't work at all, that could be a sign the motor is on its way out. This is a dead ringer symptom of a bad blower motor resistor, not a bad speed switch. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesn’t any interior or exterior trim or body part removal. I turned the fan switch on high and wiggled the plug in on the controller switch, next to the air hoses, and a puff of smoke came from the plug â¦ Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, Over 25,000 topics, from beginner tips to technical You should see battery voltage (12+). high not working on blower motor. Examined the plug at the blower motor and found it a little corroded - cleaned it and everything works fine. Replace the resistor. This is a dead ringer symptom of a bad blower motor resistor, not a bad speed â¦ The module uses that information to pulse either power or ground to the motor. See the wiring diagram below for that setup. This may also cause the blower motor to work intermittently. I hope you can easily find and fix the â¦ If the motor stops, replace the relay. That plug is a know problem. The gears in the motors are sometimes made of plastic. At that point the suspects are the blower motor speed control module (most likely) or the HVAC control head (less likely, but not unheard of). i have a 1997 chevy truck 4x4 with the 5.7 engine the high speed doesnt work on the fan, replaced the blower motor resistor. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. If it’s good, check for debris on the evaporator or heater. This is a symptom of a failing blower motor bearing. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. mountainbike; Tester. after purchase in 03, all I had was high speed on the blower motor. Is relay and â¦ I have replaced the resistor and the fan speed switch. 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