Question about 2001 Pontiac Bonneville

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The blower motor in my 01 bonneville quit working. I replaced both the blower motor and hvac control unit and it still does not worl.

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Did you change the blower motor resistor? that could be the problem,

Posted on Apr 07, 2011

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1 Answer

MY BLOWER MOTOR WAS WORKING & THEN ALL OF A SUDDEN IT STOPPED. WHY? A 2000 PONTIAC BONNEVILLE


Blower motor control module would be a good guess , but is still just a guess . Testing the electrical circuit would need to be done to know for sure . Do you know how to test electronic's , automotive electrical circuits ?

HVAC Blower Controls Circuit Description
The blower motor is controlled by the blower control module. The blower control module receives the requested blower speed from the heater and A/C control in the form of a 5 volt pulse modulated reference signal. When low speed is requested by the heater and A/C control, the pulse width is reduced. When high blower speed is requested, the pulse width is increased. An open circuit, short to ground or short to battery on the blower speed input circuit of the blower control module will disrupt the pulse modulated reference signal. If the blower control module does not receive the pulse modulated signal, the blower motor will not operate. The blower control module receives power from the rear fuse block. The blower control module also provides a ground for the blower motor. A separate blower motor flange ground is used to limit radio frequency interference.

HVAC Blower Motor Circuit

Mar 24, 2017 | Pontiac Cars & Trucks

1 Answer

Where is the heater blower resister located on a 2004 bonneville gxp


Why ? Does the blower work on high ? but no other speeds ! If it doesn't come on at any speed it's not the resistor . Does the vehicle have automatic climate control or manual ? Automatic doesn't have resistor , has a blower motor control processor . HVAC Blower Motor Circuit You need to test , not guess !

Feb 04, 2017 | 2004 Pontiac Bonneville

1 Answer

Blower fan not working at all 2004 Buick rendezvous


Which system ?
HVAC Systems - Manual HVAC Systems - Automatic
If automatic it's probably the blower motor control processor .
Blower Motor Control Processor The blower motor control processor is an interface between the HVAC control module and the blower motor. The blower motor speed control, Blower motor speed signal, battery positive voltage and ground circuits enable the control processor to operate. The HVAC control module sends the commanded blower motor speed to the control processor through a 0 to 12-volt linear ramped blower motor speed control circuit. As the blower motor speed control voltage increases, the blower motor speed increases. The control processor sends the actual blower speed to the control module through a 0 to 12-volt blower motor speed signal circuit. The processor supplies 12volts to the blower motor through the blower motor voltage supply circuit. The control processor uses the blower motor ground as a low side control to adjust the blower motor speed.

Nov 19, 2016 | Buick Cars & Trucks

3 Answers

I have a 01 blazer the heater fan quit working where is the fuse located so I can check it!


Fo to this site and create an account. From there you can access and download your owner manual which has the fuse diagram and other handy information.


https://my.gm.com/web/portal/ownercenter

Aug 13, 2016 | Cars & Trucks

1 Answer

Heat and ac controls quit working. Changed the control unit and still nothing. Checked fuses and all good.


If your saying the blower motor doesn't work, turn on the hvac and check voltage and ground at the blower motor connector. Go from there.
Can you check for applicable hvac trouble codes? Some of the national brand auto stores will check codes for free, if there are any.
At the applicable fuses, you need to check fuse circuit for voltage. Even if fuse is good, if no voltage on the fuse circuit, the circuit is still dead. Use a testlight to check voltage.

Dec 05, 2015 | 2003 Chevrolet Silverado 1500

1 Answer

Weak hvac air flow blow motor works great


tear apart ducts and check for nesting issues-Denny

Dec 31, 2013 | 1998 Pontiac Bonneville

1 Answer

1996 buick riviera heater blower won't run. I jumped the motor and it runs. Turn on the switch and it won't run


you have a piece of solder broken off the controller of your hvac unit, causing power not to get to the blower motor it self. take test light and see if you have power at the blower motor. check and see if you have continuty or brake between the power wire at the blower motor and at the hvac control unit. if wires are good then the problem will lie in the hvac control unit. check and see if the blower is working at all speeds, if it works on some speeds thens the blower motor resistor.

Sep 29, 2011 | 1996 Buick Riviera

1 Answer

My 97 buick lesabre limited heater/ac blower quit, it has the climate control,I checked all fuses.


REMOVE HEATER BLOWER MOTOR HOT WIRE BLOWER MOTOR IT.IF IT WORKS.YOUR AC AND HEATER CONTROL SWITCH IS FAULTY.CHECK HVAC FUSES AND CHECK BLOWER MOTOR RELAY.IF BLOWER MOTOR DONT WORK WHEN HOT WIRE REPLACE IT.IF ALL CHECK OUT GOOD.HAVE DEALERSHIP DO A DIAGNOSTIC TEST ON YOUR CLIMATE CONTROL SYSTEM.

Dec 02, 2010 | 1997 Buick LeSabre

1 Answer

My blower motor won't shut off


I had the same issue. Brought it back to dealer and they replaced the blower itself. Below is the bulliten


Models:
2005 Buick Allure (Canada Only), LaCrosse
2004-2005 Pontiac Grand Prix

Supercede:
This bulletin is being revised to update Step 5 of the service procedure. Please discard Corporate Bulletin Number 05-01-39-001 (Section 01 - HVAC).
Condition
Some customers may comment on an inoperative or intermittent Heating, Ventilation and Air Conditioning (HVAC) blower motor. Others may comment that the blower motor speed may momentarily drop or that the blower motor continues to run after the key is turned off.
Cause
This condition may be caused by a voltage spike from the wiper motor. The voltage spike may cause a logic lock up in the blower motor control module that may be either momentary or permanent.

Nov 21, 2009 | 2004 Pontiac Grand Prix

4 Answers

2005 Pontiac Bonneville hvac blower does not come on


Start by checking the blower resistor. It should be under the dash on the passenger side near the blower itself. You will need to remove the glove box to access it. It is a small plate that has only a few screws and a group of wires that go to a plug in the center. Unplug it and remove the screws. When you pull it out it should look like a series of small spring shaped coils. Most likely one or two of them will be burned up. Replace it in reverse order and your blower should start working again. If this is not the problem then test the fan motor itself. Hope this helps. Good luck.

Jul 26, 2009 | 2005 Pontiac Bonneville

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