When does the rear AC blower turn on?
When does the rear AC blower turn on?
Three years ago I replaced the rear blower motor control module, which caused the rear AC to start working again. That was no fun with such a tight space to try to loosen and tighten nuts in! Since then there has always been, however, an approximate three minute delay for the rear AC blower to turn on.
Why does the Chevy Avalanche blower keep blowing?
The auto climate control fan speed is controlled via PWM with a solid-state driver. Completely different system, and different issue. I am running into a similar issue. 2003 Avalanche, fan keeps blowing even after engine is off, fan turns on and off intermittently. Dual climate control.
What causes a Chevy blower motor to overheat?
Either of the above may cause the relay resistor module or wiring connector to overheat, resulting in one or more of the following symptoms: In very rare events, if the above symptoms are ignored, a fire could occur.
How long does a Chevy blower motor stay on?
In very rare events, if the above symptoms are ignored, a fire could occur. This special coverage covers the condition described above for a period of 10 years or 240,000 km, whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership.
Why is the blower motor on my trailblazer not working?
The blower motor is also affected by the same electrical problem. The wiring connections under the dash of the Trailblazer corrodes, loosens or breaks for no apparent reason. A TSB published on the Trailblazer states the only correction for this AC problem is rewiring the dash or replacing the connections.
Are there any problems with the Trailblazer air conditioner?
Complaints about the blower fan failing and not blowing cold air through the vents is a prominent complaint on Carcomplaints website. Consumers state the buttons or controls do not work on all settings and noise comes through the ventilation system. A TSB published records these complaints and announces a problem with the bearing on the fan.
Are there any problems with the Chevy Trailblazer Lt?
The Chevrolet Trailblazer LT is a light-duty SUV that took the place of the older Blazer. Several technical service bulletins are published from the manufacturer concerning air-conditioning (AC) problems in the vehicle. The 2005 Trailblazer has the most TSB’s published concerning this problem.
Why does my blower only work on high speed?
If your blower only operates on its highest speed, chances are you have the series type of blower motor resistor. This is the most common failure mode. To repair the problem, simply replace the resistor block.
Three years ago I replaced the rear blower motor control module, which caused the rear AC to start working again. That was no fun with such a tight space to try to loosen and tighten nuts in! Since then there has always been, however, an approximate three minute delay for the rear AC blower to turn on.
What happens when a blower motor relay wears out?
Without it, the AC system will not be able to circulate any heated or cooled air. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. Over time, it can eventually wear out.
What happens if you have a bad blower motor?
The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air.
How is the speed of the blower motor controlled?
The blower motor control processor controls the speed of the blower motor by increasing or decreasing the voltage drop on the ground side of the blower motor. The HVAC control module provides a low side pulse width modulated signal to the blower motor control processor over the blower motor speed control circuit.
Why is my rear AC not turning off?
Today I disconnected both the front seat (near the shifter) and first rear seat controls for the rear AC. It didn’t change anything. I finally removed the fuse under the first rear seat to get it to stop blowing. Less than a year ago I replaced the front blower motor control module because the front speeds weren’t working right.
What to do if rear blower is not working?
They wired the blower motor resistors after the motor, then comes the rear speed control then ground. Check for 12v at the YE/RD wire in CJB at fuse 7, then the G200 ground. If nothing then the aux relay.
Why is my blower not working on my expedition?
Blower runs fine when hooked up to 12 volt power. No power on any wires that go into the fan speed controllers on both. Temp & position controls seem to work, I can hear stuff moving in back when I turn them. Is/are there relays somewhere that could be bad… really stumped on this one. Check the aux a/c relay.
They wired the blower motor resistors after the motor, then comes the rear speed control then ground. Check for 12v at the YE/RD wire in CJB at fuse 7, then the G200 ground. If nothing then the aux relay.
Where is the fuse on the rear blower?
The rear blower has a fuse inline after the blower relay. On my 99 it is fuse 7 in the central junction box. From there it splits to the console blower and to the aux a/c relay located behind the driver side panel for the rear a/c up by the door.
Today I disconnected both the front seat (near the shifter) and first rear seat controls for the rear AC. It didn’t change anything. I finally removed the fuse under the first rear seat to get it to stop blowing. Less than a year ago I replaced the front blower motor control module because the front speeds weren’t working right.
The rear blower has a fuse inline after the blower relay. On my 99 it is fuse 7 in the central junction box. From there it splits to the console blower and to the aux a/c relay located behind the driver side panel for the rear a/c up by the door.
Where is the rear blower on a 99 Ford Expedition?
On my 99 it is fuse 7 in the central junction box. From there it splits to the console blower and to the aux a/c relay located behind the driver side panel for the rear a/c up by the door. With the ignition on acc, front selector on a/c, check for power on aux relay terminal 86 & terminal 30. Both should have 12v.
What causes a bad or failing blower motor relay?
Blown fuses. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay circuit fuse. If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current…
What to do if your AC or heater is not blowing?
If your Blower Motor for the AC or Heater suddenly stopped blowing, look here first, it might save you several dollars. Situation, we have a friend that owns a 2017 Chevy Trax LT, she is a nurse who works with my wife, single mom and on a single mom budget.
The blower motor is the component responsible for pushing air through the vents of your vehicle’s heating and air conditioning systems. Without it, the AC system will not be able to circulate any heated or cooled air.
What to do if your AC blower is not working?
Disconnect cables to motor and resistor. Remove hose from motor, it should just pull off with little effort. Unscrew motor and resistor. Screw new motor and resistor in. Connect hose to motor. Connect cables to motor and resistor. Turn on car and test AC. Thanks for watching! Loading…
How to replace a blower resistor and motor?
Easy video on how to replace blower resistor and motor with 1 screw driver and in about 10min. Remove glove box, pop bottom panel off to gain motor access. Disconnect cables to motor and resistor. Remove hose from motor, it should just pull off with little effort. Unscrew motor and resistor. Screw new motor and resistor in. Connect hose to motor.
How does the HVAC work on a blower?
The HVAC control module provides a low side pulse width modulated signal to the blower motor control processor over the blower motor speed control circuit. As the requested blower speed increases, the HVAC control module increases the amount of time that the speed signal is modulated to ground.
Why does my car blower motor not shut off?
If you have a vehicle with climate control system and a variable speed blower motor and the blower motor won’t shut off and stays on HIGH with the car turned off and the key out, chances are the blower motor motor control processor is toast or the HVAC control module is damaged.
What to do if your climate controlled blower wont shut off?
If your climate controlled blower processor is shot, be prepared to spend mucho bucks for a replacement. But before you start throwing expensive parts at the problem, you’ll have to do some checking. Start by testing the gray/black wire at the blower motor control processor. First, try grounding the wire. Then try removing it.
Why is my rear AC blower not turning off?
Click to expand… The three minute delay smells of the recalibration when the Keep Alive Memory is lost in the HVAC CM-Aux. Makes me think the HVCA CM-Aux is the problem even before pulling the fuse.
What should I do if my blower wont shut off?
If the blower stops with either of these steps, the problem is in the HVAC control module. However, if the blower continues to run at high speed with either of those tests, replace the blower motor control processor. Just as an FYI, the retail price of the blower motor control processor is $280.34.
Why does my GMC blower not shut off?
Once again, the symptoms are that the blower keeps going all the time even with the engine off and the key completely our of the vehicle. Also, the controls are unresponsive. The AC button and the interior circulation button are both lit and I cant switch them off. I also cannot turn the rear defrost on.
Do you need a blower motor Resister for a Chevy Avalanche?
I was told to go buy a blower motor resister, come to find out they no longer sell the resister for the 2005 Chevy Avalanche. It has to be converted to a blower motor control module these days.
