What should the voltage be on a blower motor?
If those are OK than backprobe the blower motor connector and check for power on terminal 1. Check terminal 2 for a variable voltage, this should be 12v with the fan control knob on off and 5v or full ground on full. If that checks out replace the blower motor.
What is the running amperage of a blower?
Assume that when the technician measured the pulleys and obtained the motor information, that a motor running amperage measurement was taken. This amperage is for the original conditions with a motor pulley of 8″, a blower rpm of 875, and the 3000 cfm airflow rate. The running amperage under those conditions was found to be 16 amps.
Where are the fuses on a blower motor?
Check fuses 10 & 11 in the underdash fusebox. If those are OK than backprobe the blower motor connector and check for power on terminal 1. Check terminal 2 for a variable voltage, this should be 12v with the fan control knob on off and 5v or full ground on full.
How is the RPM of a blower calculated?
The blower is used to move a given cubic feet of air per minute through an air conditioning system. Figure 13-2 In the above diagram, (See figure 13-2) the two pulley sizes are known and the rpm of the motor pulley is known. The motor pulley rpm is read from the motor data plate. Using a ratio the blower rpm can be found.
What kind of motor does a variable speed blower use?
Variable speed blower motors don’t use a blower motor resistor. Instead they use a blower motor speed control or a power transistor. Variable speed motors are most often used in vehicles with automatic climate control.
What should I do if my blower motor is not working?
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.
How does a blower motor work in a car?
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. In one design, the car maker supplies battery power to the speed switch, which switches the power to the appropriate connection on the blower motor resistor.
How are the resistors arranged in a blower motor?
Heating systems with just 3 or 4 speeds use a motor resistor along with the speed switch to regulate the motor speed. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. Blower resistors can burn out. When that happens, you lose that speed.
When do you need to use a boost blower?
For example, at full throttle, your engine is going to need about 50 percent more air than it did before the blower was installed. If your carburetor is incapable of flowing the necessary airflow, you will have lower boost. Boost readings are typically observed or measured at the intake manifold.
Do you need a bigger blower for a bigger engine?
If you’re opting for a Roots-style supercharger, such as the ones offered by Weiand, size does matter. According to Weiand, you typically want to run larger blowers on larger engines. Assuming a constant speed ratio between the engine and the blower, a larger blower will make more boost than a smaller one on the same size engine.
If those are OK than backprobe the blower motor connector and check for power on terminal 1. Check terminal 2 for a variable voltage, this should be 12v with the fan control knob on off and 5v or full ground on full. If that checks out replace the blower motor.
Check fuses 10 & 11 in the underdash fusebox. If those are OK than backprobe the blower motor connector and check for power on terminal 1. Check terminal 2 for a variable voltage, this should be 12v with the fan control knob on off and 5v or full ground on full.
How long does it take to replace a blower fan?
The problem is usually the blower motor regulator. The regulator controls the fan speed of the blower motor and can fail after many years of use. Thankfully, replacing the blower motor regulator is an easy fix, usually taking no more than an hour. In this article we will also cover the steps involved with removing the blower fan itself.
Where is the blower motor on a Sentra?
P.S. the blower motor is behind the dashboard in my car. It looks like that year Sentra uses a field effect transistor and not a traditional resister. It’s referred to as the Fan Control Amplifier and controls the ground circuit of the blower motor.
What are the symptoms of a failed blower motor resistor?
Blower motor resistor problems. Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at high speed and doesn’t work at low speeds.
When do you need to replace the blower motor relay?
If the blower motor does not function, car fuses are blown, or relays are melting, you may have to replace the car blower motor relay. 1. Blower motor does not function 2. Blown fuses 3. Melted relay The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor.
How much does it cost to replace a blower motor?
See: how to check a fuse in a car. If a blower motor is bad, it will need to be replaced. The blower motor replacement costs from $320 to $650, depending on the car. In many cars it’s fairly easy; the blower motor is located behind the glove box and held by 3-4 screws.