AC/Heat control

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by graham94, Nov 23, 2012.

  1. graham94

    graham94 New Member

    My 2005 Silverado 4x4 has lost the 1 and 5 positions on the ac/heat fan setting. Can I replace the unit or is there something else I need to look into?
  2. a.graham52

    a.graham52 Rockstar 100 Posts

    These trucks have a lot of issues with blower motor resistors and connectors melting so u want to remove the resistor and and inspect for damage and melting. I do believe there is a special policy for replacement under warrantee if this is the case. but ask ur local dealer. Also the #5 speed should have its own fuse in the underhood fuse block so check that as well. Between doing all that u should find ur problem easily.

    If u do not know where ur blower motor resistor is, it's located under the dash on the passenger side. Should have one connector with like 8 wires all in a row and then two separate wires that run to te lower motor. When u remove it tere should be no damage or burns to the connector (sometime te two will melt together and won't come apart. And also tere should be no damage, burns or rust on the inside of the resistor where it's located in the HVAC box
  3. graham94

    graham94 New Member

    Thanks for the info. I'll check it out tomorrow.

    99'HEARTBEAT MODERATOR Staff Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

    .....If your 05" has under 150,000 miles, You will be able to have this Problem with the Blower Motor Resistor Fixed at No Charge from your Local G.M./Chevy Dealer.....Below is a G.M Service Bulletin, Regarding the Problems with the Blower Motor Resistor,

    Special Coverage Adjustment
    Bulletin No.: 11046

    Date: April 07, 2011

    Subject: 11046.......SPECIAL COVERAGE ADJUSTMENT........Heating, Ventilation, and Air Conditioning Blower Not Fully Functional on All Blower Speeds, Inoperative, or Runs Continuously with the IGNITION OFF.

    2003-2006 Chevrolet Avalanche, Suburban, Tahoe
    2003"-2007" Chevrolet Silverado
    2003-2006 GMC Yukon, Yukon XL
    2003-2007 GMC Sierra
    Equipped with Manual HVAC (CJ3) or Heavy Duty Heater (C42)

    Due to part availability, owner letters will be released in phases starting with older model year first. Owners for model year vehicles not included in first phase owner mailing will receive an owner advisory letter.

    The letter will inform the customer that parts are not yet available and that another letter will be sent to them when parts become available. A copy of this letter will be attached to the dealer message announcing this bulletin.

    In the meantime, if a customer brings their vehicle to the dealership with the condition described in this bulletin, repair the vehicle using the parts called out in this bulletin.

    Condition.......On some 2003-2006 model year Chevrolet Avalanche, Suburban, Tahoe; GMC Yukon, Yukon XL; and 2003-2007 model year Chevrolet Silverado and GMC Sierra vehicles equipped with a manual heating, ventilation, and air conditioning (HVAC) system (CJ3) or heavy duty heater (C42), the interface between the electrical terminals of the relay Resistor Module and the Wiring Connector that powers the module may be incapable of conducting higher current levels for sustained periods of blower motor operation. In addition, moisture and other contaminants may enter the fresh air intake plenum and contact the internal circuit of the module or corrode the terminals. Either of the above may cause the relay resistor module or wiring connector to overheat, resulting in one or more of the following symptoms:

    - The HVAC blower may not function on certain or all blower speed settings
    - A burning plastic smell or smoke may be present in the vehicle
    - The HVAC blower may run continually with the ignition in the OFF position

    IN VERY RARE events, if the above Symptoms are Ignored......A FIRE Could Occur.

    *****This Special Coverage Covers the Condition described above for a Period of .....10 YEARS or 150,000 MILES(240,000km).....whichever occurs First, from the Date the Vehicle was Originally Placed into Service.......Regardless of Ownership.
    ****Dealer are to Install a New Blower Module Connector......and the Repair will be made at No Charge to the Customer.

    .For vehicles covered by Vehicle Service Contr
    acts, All eligible Claims with repair orders on or after April 8 2001 are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with Repair orders prior to April 8 2011 must be Sumitted to the Service Contract provider.

    Vehicles Involved......are certain 2003-2006 model year Chevrolet Avalanche, Suburban, Tahoe; GMC Yukon, Yukon XL; and 2003-2007 Model year Chevrolet Silverado and GMC Sierra Vehicles equipped with a Manual HVAV (CJ3) or Heavy Duty Heater (C42)

    Important......Dealers are to confirm vehicle eligibility prior to beginning repairs by using the Applicable Warranties section in the Global Warranty Management system.
    Last edited: Jun 5, 2014

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