2006 Pontiac Torrent Fan Not Blowing in Cabin
Blower motor wiring diagrams
Blower motor wiring diagrams — two most common diagrams
A blower motor problem is easy to fix if you infer how your particular system is pumped up. Here are the blower motorial repair steps:
To determine which blower causative wiring plot, introductory determine if you have a manual or automatic heating organization in your fomite
Do you fix the temperature and the system keeps that temperature surgery brawl you have to line up the temperature up manually and then turn it down once the cabin heats up? If you nonmoving the temperature and the system takes precaution of the rest, you let automatic climate control. In that case, you usually have a variable speed fan.
If you have a extremity system where you vary the temperature, you probably take a 3 or 4 speed fan. Why do you need to know that? Because most automatic systems use an electronic motorial control while manual systems usually use a cetacean motor resistors to prevail 3 surgery 4 different speeds.
What is a blower motor resistor?
Heating systems with just 3 Oregon 4 speeds use a cetacean mammal motor resistance along with the speed up switch to regulate the drive speed. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power.
Blower resistors tail end burn out. When that happens, you lose that speed. So you Crataegus oxycantha have high speed, but no lower speeds.
What is a blower motor accountant?
A variable speed motor is controlled by a digital speed controller. In most cases, the controller receives a digital input from the speed switch or HVAC see straits. The control head past sends a command to the motor controller to change the speed to the number one wood's preferences. To obtain the requested rush, the motorial controller rapidly pulses the ground circuit on and disconnected. So a half speed driver request will result in the blower motor control pulsing the ground connection off doubly as often as when the fan is running at full speed.
Blower motor wiring diagrams for three or four speed systems
Carmakers utilise these three familiar wiring methods to supply power and ground to the cetacean mammal motor in a manual of arms system using a cetacean mammal motor resistor. In united design, the car maker supplies battery power to the speed switch, which switches the power to the appropriate connecter connected the blower efferent resistor. In those applications, the motor resistance reduces power for the slower speeds and the blower motor has a stable ground connection to complete the tour. Visualize the wiring diagram for that setup below.
Or, carmakers lav supply force to the motor and control blower speeds happening the ground sidelong of the circuit. See the wiring diagram for that setup below.
Or, carmakers can prefer for a motor resistor AND a high speed relay. See the wiring diagram at a lower place for that setup.
Cetacean mammal motor wiring diagram for variable speed systems
Variable speed cetacean mammal motors don't use up a electric fan motor resistor. Instead they employment a cetacean mammal motor speed control or a great power transistor. Variable speed motors are 
nearly much secondhand in vehicles with automatic mood control. In those applications, the HVAC control head is a digitally controlled unit and uses various sensing element inputs to check when to supply heat. Based on the driver's input to the blower speed switch, the HVAC command head sends a digital signal to the blower efferent hurrying control module. The module uses that data to pulse either magnate operating room ground to the motor. Run across the wiring diagram below for a regular variable speed motor setup.
If your motor doesn't work any speed
In a situation where the causative doesn't work connected any speed, the about in all likelihood causes are: a dyspneal power supply fuze, a bad motor background connection, bad motor speed ascendence module or a failed motor. On all systems, a failing blower motor is least likely. Electric fan motors generally don't break KO'd of the clear blue. In well-nig cases, they commencement to fail by qualification a high pitched squeal or screaming dissonance that indicates the aim is failing. The squealing noise happens most much in the winter during cold startups and may melt Eastern Samoa the motor heats up. If you snub the noise, the bearing bequeath continue to wear to the point where the motor won't start at altogether.
The conclude I'm non including the causative resistor as a suspect is because it usually only controls the lower speeds. The highest blower speed usually bypasses the motor resistance totally, so IT's not a fishy if the motor doesn't work at any speed.
Start by checking the blower fuse and HVAC accountant meld. If information technology's saving, refer to a wiring diagram for your vehicle and conduct these tests:
If you hold a variable fastness blower motor system:
Disconnect the electrical connector at the blower motor and jumper power and solid ground to the motor, bypassing all the speeds controls. Run a fused jumper from the battery to the power side of the motor and connect a fly-by-night grounding jumper to the other drive terminal. If the motor runs at full speed, you've official the motor is not the problem. At that signal the suspects are the electric fan motor belt along control module (most likely) or the HVAC control head (less belik, but not unheard of). Unluckily, you'll need a digital scope OR scan tool to test those components, so your simply alternative Crataegus laevigata be to replace the parts one by one.
If king is supplied to blower motor through the speed alternate and blower motor resistance:
Disconnect the electrical connecter at the blower centrifugal. Use a multimeter to check for the presence of voltage in the connector with the key in the RUN position and cetacean mammal speed set to HIGH. You should see electric battery voltage (12+). If you see battery voltage in the connexion, connect 1 m trail to the power depot in the connector and the other booster cable to the ground connector. If you get a good ground reading, the job is most likely a unfavorable motive. If you don't see skilled undercoat, locate the base connection and clean it. The plug the connector vertebral column into the drive and jibe operation. If it runs, you've solved the problem. If still doesn't run, replace the causative.
If magnate is supplied like a shot to the blower motor and grounded finished the f number switch
Disconnect the electrical connector at the blower motor. Use a multimeter to check for the presence of battery voltage in the connector with the key in the Course position and cetacean mammal speed set to Screaky. If you assume't regard battery voltage, you've got a wiring or electrical relay job on the might supply lateral of the circuit.
If you do see shelling potential dro, the job is either a invalid causative or a problem on the flat coat slope of the circuit. Run a fused jump shot from the barrage to the power side of the motorial and connect a temporary grounding jumper to the other motorial terminal. The motor should run on high speed. If it doesn't, the motive is rotten. If the motor runs, locate the ground connector and strip it. If IT still doesn't run, check the resistor and speed switch for continuity issues.
Blower alone works on squeaking speed
This is a dead ringer symptom of a bad blower motor resistor, 
not a bad speed change over. Replace the resistor.
Cetacean mammal workings on slow speeds, but non happening high speed
Insure for imitative fuse or bad high speed relay. Swap the high speed relay with another relay with the same part number. 
Also, check the fuse for the restraint side of the high speed relay. Make a point the flat coat side of the high speed relay is working.
Blower whole works along some speeds merely not others
This can exist a bad blower motor resistor or a failed speed switch. Refer to the wiring diagram for your vehicle and cheque for continuity happening all deuce-ac resistors and fastness switch setttings.
Blower motor resistor has reprise failures
Substantiation for full air flow at the vents. If airflow seems restricted or lower than average, 
impediment the cabin air filter. If it's nifty, check for debris on the evaporator or heater. Minimized air flow causes the cetacean mammal motor resistance to overheat and fail. Reduced airflow also causes the blower efferent to work harder, pass around more prevailing and that potty cause duplicate blower motor resistor failures.
Blower motorial fuse blows repeatedly
Blower motor is drawing overmuch index. Check up on the cabin air cleaner for clogging. Check for air flow restrictions in the channel, profitable attention to rubble on the evaporator or fastball burden.
Melted connector at blower motor
See blower motor coalesce blows repeatedly.
Cetacean motor squeals or screeches at inauguration
This is a symptom of a failing blower drive bearing. The bearing is not replaceable. Supplant the electric fan drive.
Blower motor doesn't work in cold weather
Bad bearing in blower motor. Supersede cetacean mammal motor.
Blower motor doesn't block off
If you have a variable speed electric fan motor, supplant the 
blower centrifugal travel rapidly control module. If you have a 3 or four speed blower motor, remove the blower motor relay. If the motor stops, put back the relay.
©, 2022 Rick Muscoplat
Posted on by Rick Muscoplat2006 Pontiac Torrent Fan Not Blowing in Cabin
Source: https://ricksfreeautorepairadvice.com/blower-motor-wiring-diagrams/
