Question about 1996 Buick Park Avenue

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1996 Buick Riviera A/C blower motor started running on high all by itself while driving (air control is always in auto mode). nothing changes the fan speed, but temperature will change, air flow buttons work,runs even when OFF mode is pushed, can not go back to auto mode. Blower continues to run ever with ignition off. Had to pull the fuse to stop it. blower control module bad? where is it? Can I test it with a volt meter? thanx

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The blower motor driver transistor or relay is shorted out. It's in the blower control module. You can test it with a meter by disconnecting the battery, then measuring the resistance from the fuse terminal to the blower. If it is a continuous circuit (much less than 1 Ohm), the controller needs to be repaired or replaced. Replacing the part should be relatively cheap for someone who has the skill to identify, remove and solder the replacement for the failed part (power transistors and relays in this size class should not cost more than $10).

The caveat is that GM often uses custom-marked components. You would have to find an automotive-rated equivalent transistor or relay rated for at least the current through the fuse and at least 60 Volts, and you would have to correctly identify the transistor type (probably a MOSFET). The hard part is removing and replacing the blower controller. It may be easier to get another controller from a salvage yard than to repair. If need be, you can exchange trim panels so you can keep the original.

Posted on Jul 09, 2017

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  • 392 Answers

It would be worth checking if there is a relay in the system as this may have failed in the on position. I would also check the blower switch as this may have failed on.

Posted on Jul 09, 2017

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Posted on Jan 02, 2017

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SOURCE: Air conditioner/heater blower fan on 1997 Buick

it will be hard to diagnose with out having my hands on it but try this.

this vehicle is known for blower motor resistor failure.

under the dash on the passenger side next to the blower motor there is a resistor attatched to the blower motor case it will have a single plug with 5 or 6 wires in it, they are normally within a couple of inches of the blower motor, remove this resistor and look at closely for any signs of burning this is a common problem, you can buy one at any parts house, do not operate the motor with the resistor removed from its mounting hole or you will damage it.

if the resistor looks good than purchase you a test light and drop me a line and i will explain how to test the entire system its not hard to do.

wesleyschacht@hotmail.com

Posted on Jun 14, 2009

t1m130
  • 86 Answers

SOURCE: Blown Transformer heat pump

blown transformers are usually from a low voltage short the first thing i would do is wire a automotive or resetable 3amp fuse in line with the transformer so you dont blow transformer after transformer the wire coming off the transformer that say 24v take that wire a couple of inches down and cut it and install the fuse in series there
24v----------------
24v----------x----------
24v--------{3ampfuse}----------

now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
hope this will help you

Posted on Jul 26, 2009

  • 15 Answers

SOURCE: 1995 Buick Riviera SC: traction and the security light

traction switch is located next to drivers left knee on bottom of dash....you should be able to turn off the traction light there by just turning on the traction control.....the security light is telling you that there is a problem with your security system....could just need a new key with a new computer chip....make sure the key is clean and dry when using so it can read the chip....the security light comes on whenever your start the car and stays on for approximatley 2 minutes and then should go out....it is just a reminder....try this and see if it works....lock the door using the power switch on door.....close door and see if the security light comes on....watch and it should go out after about 2 minutes...if it does then your alarm is activated and working....to disarm you need to unlock the driver door with the key...anything else will set the alarm off and the lights will start flashing and the horn honking...after you set the alarm off you will always have to use the key to unlock the drivers door to turn off the alarm and reset the security system.

Posted on Aug 11, 2009

  • 5 Answers

SOURCE: 1996 Buick Riviera Heater/AC blower motor replacement

should be seven mil. screws pass. bottom take plastic panels off

Posted on Sep 28, 2009

  • 234 Answers

SOURCE: Blower motor doesn't come on. Traced electrical

That is a BSC, or blower speed controller. This is a very common concern, in most cases if you simply wiggle the harness the controller will start to work.
This should be located on the a/c case under the hood below the heater hoses.

Posted on Oct 20, 2009

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Where is fuse box under hood of 96 riviera


Or you can lower the under - dash cover on passenger side and un plug the blower motor itself

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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.

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I have a 2003 Buick Rendezvous and when I turn on the AC or heating nothing comes out of the vents. I had it checked at Meineke and they said the fuses are fine and the blower motor is working. Do you have...


If nothing is coming out, put your hand on the blower motor under the glovebox and put the fan on high. You should hear and feel it. If not you may have to replace the blower. Dont\'t replace it till you verify it is getting power.

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COOLING FAN IS CONTROLLED BY COOLANT TEMPERATURE SENSOR (CTS). REMOVE THE CONNECTOR FROM IT AND IT SHOULD STOP THE FAN.
OR JUST REMOVE BATTERYGROUND CABLE.
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1 Answer

Almost no air comes from the ac vents but fan is on high. This happens on auto and also on econ.


The 1992 was prior to Buick putting cabin air filters in so there is not a possibility it is clogged. So more than likely your blower motor is going bad or your fan control switch is bad. Does this problem occur with heating as well as AC? Does it change if you switch between blowing on floor, face, window(defrost) If it doesnt change based on location of blow and type of air temp then I would start by turning fan on high and placing head (ear ) against dash in center of console area. Have someone turn fan knob from low to high with engine OFF...After goign from low to high and back a few times you can see if the blower motor is responding to signal from switch. Listen for a whine, squeal, rattle, or humm. A whine or Humm would indicate a bad blower motor... Squeal or rattle a bad squirrel cage/fan blower blades. If you hear no noise and no perceivable change in blower speed/noise then its possible your switch is bad. Unfortunately the only way to definitely diagnose either is to pull the switch from dash and use multimeter to test for voltage change and for blower motor to pull dash. There is a digital control unit for your car as well. Although rare sometimes the wires on this can loosen or it can go bad. But since you didnt state teh fan wasnt working at all and you are getting cool air, that woudl be teh last thing to check

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1 Answer

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1996 buick riviera blower motor will not shut off


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