Hi, how can I check to see if blower motor relay or a fuse My heater won’t come on and replace blower 1986 Buick
Hi, how can I check to see if blower motor relay or a fuse is bad. My heater won't come on and I replace blower & resistor too.
My car has 80000 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hi there, there are actually several additional components to check for blower motor operation. First is fuses – easiest and least expensive to test. There is a blower motor relay, and also one or motor blower motor resistors, and a fusible link, any of which could cause the blower motor not to operate. All of these components (except the fuse) are mounted on the firewall close to the blower motor proper. Time to get out the voltmeter and do some checking. For assistance with this task, I would recommend an inspection of the blower motor wiring by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.
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One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function. As the relay is the switch that supplies current to the blower motor, if it fails internally, then power may be cut off from the blower motor circuit causing the motor to no longer function.
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.
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.
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.
In a blower motor, the relay supplies the power that allows the fans to circulate warmed air. Essentially an on/off switch, the blower motor relay`s reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor.
Relays can look very similar from the outside so they normally have the circuit schematic, voltage rating, current rating and terminal numbers marked on the body to identify them. This shows the basic internal circuits (including any diodes, resistors etc.) and terminal layout to assist wiring.
Essentially an on/off switch, the blower motor relay`s reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor. Blower motor relays tend to wear out over time from the stress of constantly flicking back-and-forth.
Relays can also fail due to poor contact alignment and open coils. Selection of the proper relay type for a given application is the most significant factor affecting relay reliability.
Essentially an on/off switch, the blower motor relay`s reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor. Blower motor relays tend to wear out over time from the stress of constantly flicking back-and-forth.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
Hi, how can I check to see if blower motor relay or a fuse My heater won’t come on and replace blower 1986 Buick
ANSWER : Hi there, there are actually several additional components to check for blower motor operation. First is fuses – easiest and least expensive to test. There is a blower motor relay, and also one or motor blower motor resistors, and a fusible link, any of which could cause the blower motor not to operate. All of these components (except the fuse) are mounted on the firewall close to the blower motor proper. Time to get out the voltmeter and do some checking. For assistance with this task, I would recommend an inspection of the blower motor wiring by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.
Hi, how can I check to see if blower motor relay or a fuse My heater won’t come on and replace blower
ANSWER : Hi there:
It’s more than likely that you have an electrical short that is causing the fuse to pop when you activate the heater. This could be caused by a frayed or exposed wire, or the electrical relay being damaged. This can be very difficult to explain how to trace the diagnosis procedure, so it’s best to contact a local mechanic to complete a heater is not working inspection to do that for you.
If I get my blower motor replaced, do I also have to have my Ac recharged after replacing blower motor?
ANSWER : The blower motor on this vehicle is a simple removal and installation and does not require anything to be touched on the A/C. The refrigerant does not have to be removed. The only component that has to be removed is the glove box under cover to get to the blower motor.
Car blows ecm run/start fuse after starting and then dies replaced fuse and repeats
ANSWER : Hi there. Typically when this issue occurs, damage will be instant – meaning if it’s going to damage the ECU, replacing the fuses would not help start the vehicle. So, at first glance, I would assume the ECU is OK. What is more likely is that you have an exposed wire somewhere that is causing the fuses to pop. Trying to diagnose these issues can be tricky sometimes, so it might be a good idea to have a professional mechanic complete an electrical problems inspection to isolate why you’re having these issues and recommend the right repairs.
Heater blower stuck on high and will not turn off unless igniton is off
ANSWER : This suggests that the relay may be supplying power to the blower motor regardless of turning the switch off. The blower motor relay supplies power to this motor when you turn the switch to "on" that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all. This may also cause the blow motor to work intermittently. I would suggest having an expert from YourMechanic come to your location to diagnose your vehicle’s blower motor system.
How to remove blower motor fuse or relay or to shut it off completely?
ANSWER : Both the fuses you mentioned are for the blower motor. The most likely problem is the blower motor relay built into the blower-motor-resistor has stuck on. The high-blower fuse has power all the time. The low-blower fuse only has power with the key on. So pull the high-blower fuse. You still may be able to control the blower motor on speeds 1, 2, or 3, but it may just not work at all. The part that will most likely need to be replaced is the blower-motor-resistor. I recommend having the AC inspected by a certified technician to verify the faulty component. From there, they can move forward with the correct repairs.
Fan blower motor not working replaced resistor and blower motor but I don’t know we’re the fuse or relay is located
ANSWER : The fuse and relay is in the power distribution center which is mounted under the hood on the left side of the engine compartment. Remove the top cover and look on the under side of the cover. You will see a diagram showing the position and name of each fuse and or relay. Keep in mind to make sure you are correctly oriented with the position of the fuse block. It can be confusing at times.
In addition to the fan motor, relay, fuse, and blower resistor, the A/C heater controls the fan speed selection. These are known to fail on Chrysler products. A scanner capable of communicating with the climate control system is necessary to diagnose this system. To avoid any unnecessary repairs, have a certified technician, like one from YourMechanic, diagnose your heating & A/C issue firsthand.
Good luck!
think heater relay is gone checked today lost heat yesterday but dont know what it looks like the plug is melted also this small p
ANSWER : Hello, thank you for writing in. The main component related to the heating system that is located near the dash board is the heater core. If this relay or part of the circuitry that you have found damaged is part of the fan circuit, it would explain your symptoms. Without knowing exactly what you are looking at it is impossible to tell. You have done the hard part by finding the damaged components, and should start by resolving that issue first. If you are still having issues after repairing the wires/relay, you will want to look further into the symptoms the heating system is having. For more diagnostic help, contact our service department to schedule an appointment.
