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MIKEVIN_BEGGS
MIKEVIN_BEGGS, ASE Certified Technician
Category: Car
Satisfied Customers: 162
Experience:  General Motors, Ford, & Mitsubishi Certified technician.
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2005 GMC Yukon...front a/c wont blow...rear does work.

Customer Question

2005 GMC Yukon...front a/c wont blow...rear does work. ck''d all relay fuses under hood, replaced blower motor, still nothing. Checked resistor/relay w/ light test and light would only come on at level 5 power, not 4 3 2 or 1. Sound like a/c blower switch or resistor/relay? Thank you for your help.
Submitted: 6 years ago.
Category: Car
Expert:  MIKEVIN_BEGGS replied 6 years ago.

Hello, my name is Kevin.

When you are satisfied with my answer, Please click ACCEPT. Positive feedback is always appreciated.

Well, with these guys it is one of two things.

1. The a/c control head is the cause 80% of the time.

2. The blower motor resistor or wiring to the resistor is the cause 15% of the time.

3. The last 5% divided between the blower motor & wiring issues & both are rare.

==============================================================

Bulletin No.: 05-01-38-012C

Date: November 02, 2006

TECHNICAL

Subject:
EI05082 - Loss of Blower Motor Speeds Except for Low Speed or Inoperative (Replace Blower Motor Resistor and Resistor Module Connector)

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)

Supercede:

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.

graphic

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.

graphic

graphic

===============================================================

Bulletin No.: 06-01-39-002C

Date: January 18, 2008

TECHNICAL

Subject:
Blower Motor Inoperative or May Not Shut Off in Extremely Low Ambient Temperature Conditions (Replace Blower Motor Control Module)

Models:
2004-2007 Buick Rainier
2003-2006 Cadillac Escalade Models
2003-2006 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2003-2007 Chevrolet TrailBlazer Models
2007 Chevrolet Silverado (Classic)
2003-2006 GMC Sierra Models Yukon Models
2003-2007 GMC Envoy Models
2007 GMC Sierra (Classic)
2003-2004 Oldsmobile Bravada
2003-2006 HUMMER H2 Models

with Automatic Temperature Control HVAC System (RPO CJ2)

Supercede:

This bulletin is being revised to update the model years that are affected and add the Oldsmobile Bravada. Please discard Corporate Bulletin Number 06-01-39-002B (Section 01 - HVAC).

Condition

Some customers may comment that the blower motor is inoperative or continues to run after the vehicle has been shut off.

Cause

These conditions may be caused by a blower motor control module failure. This failure may occur when the vehicle is operated in ambient temperature conditions of-23°C (-10°F) or below.

Correction

Replace the blower motor control module if the vehicle experienced a blower motor control module failure in extremely cold ambient temperature conditions.

Technicians are to replace the blower motor control module also called the Linear Power Module (LPM) with the P/N listed below. Refer to either the Blower Motor Control Processor Replacement or Blower Motor Processor Replacement-Auxiliary procedures in SI. After replacement of the blower motor control module the customer may notice a slightly higher than expected blower motor speed at any of the blower speed settings.

graphic

graphic

graphic

===============================================================

Kevin

MIKEVIN_BEGGS, ASE Certified Technician
Category: Car
Satisfied Customers: 162
Experience: General Motors, Ford, & Mitsubishi Certified technician.
MIKEVIN_BEGGS and 12 other Car Specialists are ready to help you
Customer: replied 6 years ago.
Reply to KEVIN BEGGS's Post: i will accept your answer definetly...but is it difficult to replace a/c control head? which is another name for the control knob w/ 1 2 3 4 and 5 on it correct? just remove the lower panel and....? Sorry not real good w/ this
Expert:  MIKEVIN_BEGGS replied 6 years ago.

No, it is very easy to replace.

Tilt the steering wheel all the way down & apply the emergency brake. Turn the key to on, but do not start the truck. Drop the gear selector to first, then turn the key back as far as it will go.

Give the center dash trim a good tug (don't muscle it) at the speedo cluster & gently release the rest all the way around.

Set it aside & then remove the four screws that hold the a/c control head. Unplug & replace.

Reassemble in reverse order.

Be gentle with the dash trim or it will break.

Kevin

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