A/C Motor not running

Tiny
HOWDY_AG
  • MEMBER
  • CHEVROLET SILVERADO
2005 Chevy Silverado, 92000 miles, the a/c blower stopped blowing however the compressor still works because if I am going down the road cool air comes out of the vents. I have checked all of the fuses I know to check. What am I missing. It was working one minute. I went into a store and when I came out and started the truck, it did not work.
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Monday, October 1st, 2007 AT 4:37 PM

8 Replies

Tiny
BOOTDOG
  • MEMBER
Check for a blown fuse, bad relay, and/or resistor. Also check for bad grounds, loose connections, and if all that passes then the motor's no good.
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Monday, October 1st, 2007 AT 5:56 PM
Tiny
DENNYP
  • EXPERT
The most common problem I see is a melted blower resistor and connector.
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Monday, October 1st, 2007 AT 8:20 PM
Tiny
BESTAUTOTECH
  • MEMBER
The most common problem I see is a melted blower resistor and connector.[/Quote:54926bbad7]
normally if it is the resistor you should dtill have high speed
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Monday, October 1st, 2007 AT 9:29 PM
Tiny
DENNYP
  • EXPERT
The most common problem I see is a melted blower resistor and connector.[/Quote:e78a7951a0]
normally if it is the resistor you should dtill have high speed[/quote:e78a7951a0]On the 05' high speed goes through the resistor also.
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Monday, October 1st, 2007 AT 9:48 PM
Tiny
DENNYP
  • EXPERT
The most common problem I see is a melted blower resistor and connector.[/quote:d68770ab58]
normally if it is the resistor you should dtill have high speed[/quote:d68770ab58]On the 05' high speed goes through the resistor also.[/quote:d68770ab58]


http://www.2carpros.com/forum/automotive_pictures/102900_blower_1.jpg

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Monday, October 1st, 2007 AT 9:52 PM
Tiny
HOWDY_AG
  • MEMBER
Thank you for this information. Where is this resistor located and can I replace it myself or do I need to take it to a shop.
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Tuesday, October 2nd, 2007 AT 8:12 AM
Tiny
DENNYP
  • EXPERT
Subject: EI05082 - Loss of Blower Motor Speeds Except for Low Speed or Inoperative (Replace Blower Motor Resistor and Resistor Module Connector) keyword fan #05-01-38-012C - (11/02/2006)

Models: 2004-2006 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer, TrailBlazer EXT

2007 Chevrolet Silverado (Classic) Built Prior to September 1, 2006

2004-2006 GMC Envoy, Envoy XL, Sierra, Yukon, Yukon Denali, Yukon XL

2007 GMC Sierra (Classic) Built Prior to September 1, 2006

with HVAC System AC Front, Manual Temp Control (RPO CJ3) or Heater Only (RPO C42)

This bulletin is being revised to clarify the Warranty Information. Please discard Corporate Bulletin Number 05-01-38-012B (Section 01 -- HVAC).

Condition
Some customers may comment that the blower will only work on low speeds or has become inoperative.

Correction
REPLACE THE BLOWER MOTOR RESISTOR AND RESISTOR MODULE CONNECTOR.

Replace the blower motor resistor and module connector using the following procedure:

Remove the blower fuse.
Fullsize Trucks and Utility Vehicles -- Htr A/C & HVAC 1 fuses

Midsize Utility Vehicles -- Blower Fuse 35 located in the Underhood Fuse Block

Lower the hush panel or close-out panel enough to gain access to the resistor module connector.
Disconnect the connector from the resistor module.
Remove the tape from the wiring harness to expose the wiring.

Cut the wires back far enough from the connector to eliminate any melted insulation on the wire.
Tip
Use the old connector as a map for splicing the wires for the new connector. Be sure to use the correct crimping tool from the terminal repair kit J 38125. Use only Duraseal splice sleeves. Other splice sleeves may not protect the splice from moisture or provide a good electrical connection.

Install the new connector. Use the yellow splice sleeves provided with the connector.
Install new blower motor resistor.
Reinstall the fuse or connector block. Test the blower motor to make sure all speeds are functional.
Reinstall the hush panel/close-out panel.
Parts Information
Important: To determine which resistor to use for Fullsize Truck/Utility vehicles, search the parts catalog using the vehicle's VIN.

Part Number
Description
Qty

15862656
Connector - Resistor Blower Motor (includes splice sleeves)
1

89019088
Resistor -- Blower Motor (Fullsize Truck/Utility)
1

89019089
Resistor -- Blower Motor (Fullsize Truck/Utility)
1

89019100
Resistor -- HVAC & A/C (midsize utility vehicles)
1

Blower Motor Resistor Replacement
Removal Procedure
If equipped, remove the IP sound insulator. Refer to Insulator Replacement - Instrument Panel (I/P) in Instrument Panel, Gages, and Console.

Disconnect the electrical connection from the blower motor.
Disconnect the electrical connection from the blower motor resistor.

Remove the blower motor resistor retaining screws.

Remove the blower motor resistor.
Installation Procedure

Install the blower motor resistor.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Install the blower motor resistor retaining screws.

Tighten
Tighten the screws to 1.6 N m (14 lb in).

Connect the electrical connection to the blower motor resistor.
Connect the electrical connection to the blower motor.
If equipped, install the IP sound insulator. Refer to Insulator Replacement - Instrument Panel (I/P) in Instrument Panel, Gages, and Console.
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Tuesday, October 2nd, 2007 AT 4:39 PM
Tiny
ALISHAHOO
  • MEMBER
DennyP is my hero!

"the most common problem I see is a melted blower resistor and connector"

Thank you so very much. With yours and my husband's knowledge, we were able to fix my problem for under $30.00. The dealership would have had us come up there and hook it into the computer, which would have been an extreme waste of $100.00. And then the money to fix it, which I don't have. Using the information you gave, I was able to disconnect the blower motor resistor myself in preparation for my husband to hook up the new one. I feel so fortunate that the information was available to a person like me who knows next to NOTHING about electronics or autos!

Just like several other folks had mentioned, the 1st and last speed on the AC quit working, and then months later, no air blew out at all. I know now if any of the speeds quit working, it's time to start diagnosing the problem. My resistor was completely melted, just as you said was most common, and had started to melt the wiring and resistor connector. I didn't even know what one was two days ago. By reading these posts, it seems to me Chevy has a problem in this area, and they should be paying to fix it on all our vehicles!
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Tuesday, October 7th, 2008 AT 4:38 PM

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