Question about 2005 GMC Envoy

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Trouble shooting climate control intermitting blower problem # 5 speed has not been working for about 3 months # 1 2 3 4 speed is now working intermittingly

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GMC has an ongiong problem with the blower motor resistor, look under the dash on the passenger side and you will see the blower housing, unplug the wireing harness that feeds it and look at the plug carefully you will see that the third pin from the left has been over heated and is melted a little. the repair is quick and easy go to your local parts store and purchase a new resistor and a replacement wireing plug, you will have to cut the old plug off and splice the new one in, replace the resistor and your done. I would recomend that the wires be and spliced cut one at a time so as to insure that they are put in the right location.

Posted on Sep 10, 2010

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Go on the passengers side and under the dash you will find the blower motor.Follow the connector to the blower motor resistor.This is the usual culprit.Check the connections over very carefully for burns or melting.You may need to replace the blower resistor and the connector.Hope this helps.Good luck.

Posted on Sep 10, 2010

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My husbands truck was doing something simuiler and when we went to replace the fan motor the clip was burnt and the points weren't touching with a solid conection so we didn't have to replace the motor he has a one ton 05 silverado

Posted on Sep 10, 2010

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1 Answer

Can anyone tell me where the fuse and/or relay is located for the blower motor on a 2005 Buick LaCrosse


First off , does it work on any speed ? After looking at a wiring diagram I find out your vehicle has a Blower motor control processor , a module ! That is your problem ,more then likely !
DEFINITION: The blower motor is inoperative in all speed positions.

1

Did you perform the Diagnostic System Check - Vehicle?
--
Go to Step 2
Go to Diagnostic System Check - Vehicle

2

  1. Turn ON the ignition, with the engine OFF.
  2. Place the blower switch in each speed position.
Does the blower motor operate in any of the speed positions?
--
Go to Blower Motor Malfunction
Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the blower motor connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the blower motor supply voltage circuit and the blower motor control circuit.
  5. Place the blower motor switch in the minimum speed position.
Does the test lamp illuminate?
--
Go to Step 9
Go to Step 4

4

Test the battery positive voltage circuit of the blower motor control processor for the following:
?€¢
An open


?€¢
A high resistance


?€¢
A short to ground

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 15
Go to Step 5

5

Test the ground circuit of the blower motor control processor for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 15
Go to Step 6

6

Important: Ensure that the blower motor control processor connector and the HVAC control module connectors are connected during this step in order to avoid misdiagnosis.

  1. Measure the voltage from the blower motor speed control circuit at the HVAC control module to a good ground.
  2. With the ignition ON, turn the blower motor to high then to OFF.
Does the voltage measure near the specified values?
5 V OFF
1 V ON
Go to Step 10
Go to Step 7

7

  1. Turn OFF the ignition.
  2. Disconnect the HVAC control module.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the blower motor speed control circuit of the HVAC control module to a good ground.
Does the voltage measure near the specified value?
5 V
Go to Step 11
Go to Step 8

8

Test the blower motor speed control circuit of the HVAC control module for the following:
?€¢
An open


?€¢
A short to ground


?€¢
A short to voltage

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
Go to Step 15
Go to Step 10
If your not familiar with trouble shooting automotive electrical circuits I suggest you take it to a ASE certified repair shop !

Jan 07, 2016 | Buick Cars & Trucks

2 Answers

Fan blower not blowing


Most likely need a new blower motor resistor

Aug 04, 2014 | 2001 BMW 325Ci

1 Answer

Heater switch replacment


Hello! it's my job to make things as easy for the customer as possible...Therefore I must ask why you want to replace the heater switch? Is it because you have lost one or two of the switch speeds? Your vehicle is noted for loss of the Blower Motor Resistor...
Changing the Heater switch means removal of the Climate Control Assembly which is not the easiest of jobs...I've included the process...But are you sure the blower resistor is OK? If you have lost 1,2, or all blower motor speeds it's more than likely the Resistor pack. And a lot easier to change...
Guru...saailer


Remove climate control:





12_26_2011_2_15_09_am.gif
  1. Remove the instrument cluster finish panel...
  1. Remove the 3 climate control assembly screws...
  1. Disconnect the climate control assembly vacuum connector...
  1. Disconnect the 5 climate control assembly electrical connectors...
  1. Remove the climate control assembly..
Removal of blower motor Switch:
  1. Remove the climate control assembly.
  1. Remove the blower motor switch knob.
  1. Remove the blower motor switch.
    1. Remove the screw.
    1. Remove the blower motor switch.

Removal of blower motor Resistor:


12_26_2011_2_22_49_am.gif
Blower Resistor is under the battery tray...

MOTORCRAFT Part # YH1698 ...cost $25

12_26_2011_2_28_50_am.jpg

Guru...saailer

Dec 22, 2011 | 2007 Ford Econoline

1 Answer

2001 BMW X5 Climate Control (AC) not working


its not a fuse i had the same problem on my 03 x5 it an ac resistor thats at fault it controls your fan once it goes your fan wont come on or comes on intermitently once again the faulty part is a blower motor resistor should be 100 bucs at dealer or if you shop around i got mine for 75 from local parts store (carquest)

Sep 20, 2009 | 2003 BMW 5 Series

1 Answer

Where exactly is the blower motor resistor for a 1997 E36 BMW located? The car has climate control. Is there a website or a place with photos specific to this vehicle??


Hi, hope the folowwing will help i found on internet if not email me at globalsat1@gmail.com. My service manual say its in the upper leftside of the heaterbox. remove lower left dash trim panel (drivers) and pull out resistor pack.

Fixing BMW E36 Blower Fan Speed . . . DIY!
It has been two weeks since my blower fan stopped working correctly on the low speed options (1, 2 and 3 ). It only works on high speed (Option 4). At first, I thought that the problem was in the fan speed switch because I’ve seen this problem before and when I told my electrician about it, he disassembled the switch and tried to clean it. Of course this solution didn’t work. So, I’ve decided to dig for the solution myself and I found that this is a pretty common problem among E36 cars. The problem is that speed 1, 2 and 3 are controlled by something called (Final Stage Unit on digital climate control units, Blower Resistor Pack on analog climate control units). The 4th speed is actually uncontrolled, so, it simply bypasses the final stage or resistor pack units. That explains why the fan works on the 4th speed and not the other lower speed options. Anyway, I tried to find a DIY (Do It Yourself) procedure on how to fix this problem and I found one that was written by "Deem3" on bimmerforums (thank you Deem3 for the great write-up). Now take a look below. It’s a really simple procedure. I will be trying it this weekend to see how it goes. I will post more details about this job soon. Symptoms (2 cases):
- Digital Climate Control: All the lights on your digital climate control are working and the buttons respond but the blower doesn’t blow any air.
- Analog Climate Control: The blower doesn’t work except on the highest speed (4th position).To replace it, we need to take off the driver’s side knee bolster. This only requires you to remove two screws,one on the right side of the bolster and one on the left. Using the phillips screwdriver remove the following screws. Now remove the speaker and footwell light. Using the 10mm socket remove the 3 bolts holding the metal shield. And using the phillips screwdriver remove the obd2 port. Now you should be able to see the footwell air duct. Remove it by pulling it.
With everything out of the way you should now be able to see the defective final stage unit. Remove it using the torx-20 screw driver. Replace it with the new part and before you put everything back turn on your car and test the blower. If everything is ok proceed to put everything back, and enjoy the benefits of having a blower in your car again.
.

Aug 06, 2009 | BMW 328 Cars & Trucks

1 Answer

1992 Jeep Cherokee climate controls just stopped working


unplug the blower motor, try that, i have seen a direct short in the blower motor cause that. also check the blower moror resistor--again another fault---hope that was helpful

Aug 05, 2009 | 1992 Jeep Cherokee Briarwood

1 Answer

Blower fan only works on high


CHECK THE HVAC CTRL FUSE.

WITH A TEST LIGHT CHECK THE BLOWER RESISTOR FOR POWER ON THE YELLOW, TAN, PURPLE, AND LIGHT BLUE WIRES. THE ORANGE WIRES CONTROL THE HIGH SPEED CIRCUIT. DO THIS FOR EACH POSITION OF THE BLOWER SWITCH.

THE BROWN WIRE ON THE HVAC CONTROL CONNECTOR 1 POSITION B COMES FROM THE HVAC FUSE 20 AMP. NO POWER ON THAT WIRE WILL CAUSE THE BLOWER TO NOT FUNCTION ON THE LOWER SPEEDS.

Jul 14, 2009 | 2000 Pontiac Grand Prix

2 Answers

Blower motor or resistor?


Yes its the blower motor resistor.

More then likley theres some trash or something in it, or possibly the motor itself is on it's way out. There not that bad to pull out of that body car, just pull it out and see what you can see.

The blower motor is under the glove compartment

You can replace the resistor on your own. Please find a detailed diagram which would guide you to do it.

http://autorepair.about.com/library/images/bl629a-lib.htm

Thanks

Apr 09, 2009 | 2000 Chevrolet Malibu

2 Answers

Fan speed switch only works on #5


Call your local GMC Dealer and see if they have the climate control panel in stock. What happens is the circuit board on the back of the panel shorts out. The panel comes as an assembly and is very easy to replace. Don't go with a wrecking yard piece. I made that mistake once and it didn't work either. I got one from the Chevy dealer and it worked perfectly.

Aug 21, 2008 | 2002 GMC Sierra

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