I have an 02 Avalanche near auto climate control. This summer my AC stopped working because my blower wouldnt kick on. I deal with it, but presently its winter and I have no boil, more importantly no defrost, not to mention my 2 month old tot. I have replaced the blower, the blower control module and the hvac control module contained by the dash. Everyone Ive asked said it have to be one of these 3 things, wells its not. Anyone hold any ideas, or experience near this type of problem? Oh yeah, its not a fuse and the wiring within the dash is fine, no burns. Only other entity I can think of is a relay. If you know something I can provide more information on whats be done, thanks!
Answers: A/C - Loss of Mode or Temperature Control
Notes
Bulletin No.: 04-01-39-007
Date: June 17, 2004
TECHNICAL
Subject:
Loss Of HVAC System Mode and/or Temperature Control (Replace HVAC Control Module)
Models:
2002 Cadillac Escalade, Escalade EXT
1999-2002 Chevrolet Silverado, Suburban, Tahoe
2002 Chevrolet Avalanche
1999-2002 GMC Denali, Sierra, Yukon, Yukon XL
2001 GMC Sierra C3
2002 GMC Sierra Denali
near Automatic HVAC System (RPO C68)
Condition
Some customers may comment that they cannot control the HVAC system modes and/or the temperature. These concerns may be intermittent.
Cause
An HVAC control module logic lock-up may be the rationale of these conditions.
Correction
Important: Prior to replacing the HVAC control head, review Corporate Bulletin Number 01-01-39-007.
Replace the HVAC control module. Refer to the HVAC Control Module Replacement procedure within the HVAC System - Automatic sub-section of the Service Manual.
A/C - Loss of Mode/Temperature Control
Notes
File In Section: 01 - HVAC
Bulletin No.: 01-01-39-007
Date: January, 2002
TECHNICAL
Subject:
Loss Of HVAC System Mode and/or Temperature Control
(Reroute Wiring Harness)
Models:
1999-2002 Chevrolet and GMC C/K Pickup Models (Silverado and Sierra) 1999-2002 Chevrolet and GMC C/K Utility Models (Avalanche, Suburban, Tahoe, Yukon, Yukon XL, Denali) 2001 GMC Sierra C3
2002 GMC Sierra Denali
2002 Cadillac Escalade, Escalade EXT
Condition
Some customers may comment that they cannot control the HVAC system modes and/or the temperature. These concerns may be intermittent.
Cause
There may be poor terminal contact and/or bent terminal in connectors C206 (RPO C68 automatic HVAC controls) or C296 (RPO C60 brochure HVAC controls). Excessive tension on the wires due to the electrics harness being misrouted contained by the instrument panel carrier may grounds these conditions.
Correction
1. Remove the Air Bag fuse.
2. Disconnect the steering wheel and instrument panel (IP) nouns bag connectors. Refer to the SIR subsection of the Restraints article of the Service Manual for connector locations.
3. Remove the IP upper trim pad.
4. Locate connector C206 (6 cavities) or C296 (8 cavities). The connector is attached to a metal brace on the far right side of the IP haulier above the IP air distributor duct.
5. Inspect the routing of the electric wiring harness to the connector. The proper routing of the wiring harness is above the atmosphere distributor duct with no rigidity on the terminals surrounded by the connector. The routing is improper if the electrics harness is below the air distributor duct next to excessive tension on the terminal in the connector. The excessive stiffness may cause poor terminal contact, resulting contained by open circuits, surrounded by the connector. The wires may also pull the terminal out of the connector or pull out of the terminal itself.
6. If the harness is routed properly, contact Technical Assistance for further information.
7. If the harness is misrouted, remove the connector from the brace.
8. Disconnect the connector.
9. Perform a pin drag trial on the female terminal.
10. Inspect the male terminal for straightness.
11. Inspect the wire to terminal nouns to insure that no wires have pulled out of the terminal.
12. Reroute the wiring harness above the upper air distributor duct.
13. Firmly reconnect and reseat the connector.
14. Reattach the connector to the metal brace.
15. Reinstall the IP upper trim pad.
16. Turn Off the ignition and reconnect the steering helm and IP air loads.
17. Reinstall the Air Bag fuse.
18. Turn ON the ignition and verify that the air pod light flashes seven times and go out.
19. Clear any diagnostic trouble codes that may have be set.
20. Verify proper operation of the HVAC system mode and temperature controls.
May this will give a hand.This is GM TSB's.
Any mechanic to answer sound out in...
Answers: A/C - Loss of Mode or Temperature Control
Notes
Bulletin No.: 04-01-39-007
Date: June 17, 2004
TECHNICAL
Subject:
Loss Of HVAC System Mode and/or Temperature Control (Replace HVAC Control Module)
Models:
2002 Cadillac Escalade, Escalade EXT
1999-2002 Chevrolet Silverado, Suburban, Tahoe
2002 Chevrolet Avalanche
1999-2002 GMC Denali, Sierra, Yukon, Yukon XL
2001 GMC Sierra C3
2002 GMC Sierra Denali
near Automatic HVAC System (RPO C68)
Condition
Some customers may comment that they cannot control the HVAC system modes and/or the temperature. These concerns may be intermittent.
Cause
An HVAC control module logic lock-up may be the rationale of these conditions.
Correction
Important: Prior to replacing the HVAC control head, review Corporate Bulletin Number 01-01-39-007.
Replace the HVAC control module. Refer to the HVAC Control Module Replacement procedure within the HVAC System - Automatic sub-section of the Service Manual.
A/C - Loss of Mode/Temperature Control
Notes
File In Section: 01 - HVAC
Bulletin No.: 01-01-39-007
Date: January, 2002
TECHNICAL
Subject:
Loss Of HVAC System Mode and/or Temperature Control
(Reroute Wiring Harness)
Models:
1999-2002 Chevrolet and GMC C/K Pickup Models (Silverado and Sierra) 1999-2002 Chevrolet and GMC C/K Utility Models (Avalanche, Suburban, Tahoe, Yukon, Yukon XL, Denali) 2001 GMC Sierra C3
2002 GMC Sierra Denali
2002 Cadillac Escalade, Escalade EXT
Condition
Some customers may comment that they cannot control the HVAC system modes and/or the temperature. These concerns may be intermittent.
Cause
There may be poor terminal contact and/or bent terminal in connectors C206 (RPO C68 automatic HVAC controls) or C296 (RPO C60 brochure HVAC controls). Excessive tension on the wires due to the electrics harness being misrouted contained by the instrument panel carrier may grounds these conditions.
Correction
1. Remove the Air Bag fuse.
2. Disconnect the steering wheel and instrument panel (IP) nouns bag connectors. Refer to the SIR subsection of the Restraints article of the Service Manual for connector locations.
3. Remove the IP upper trim pad.
4. Locate connector C206 (6 cavities) or C296 (8 cavities). The connector is attached to a metal brace on the far right side of the IP haulier above the IP air distributor duct.
5. Inspect the routing of the electric wiring harness to the connector. The proper routing of the wiring harness is above the atmosphere distributor duct with no rigidity on the terminals surrounded by the connector. The routing is improper if the electrics harness is below the air distributor duct next to excessive tension on the terminal in the connector. The excessive stiffness may cause poor terminal contact, resulting contained by open circuits, surrounded by the connector. The wires may also pull the terminal out of the connector or pull out of the terminal itself.
6. If the harness is routed properly, contact Technical Assistance for further information.
7. If the harness is misrouted, remove the connector from the brace.
8. Disconnect the connector.
9. Perform a pin drag trial on the female terminal.
10. Inspect the male terminal for straightness.
11. Inspect the wire to terminal nouns to insure that no wires have pulled out of the terminal.
12. Reroute the wiring harness above the upper air distributor duct.
13. Firmly reconnect and reseat the connector.
14. Reattach the connector to the metal brace.
15. Reinstall the IP upper trim pad.
16. Turn Off the ignition and reconnect the steering helm and IP air loads.
17. Reinstall the Air Bag fuse.
18. Turn ON the ignition and verify that the air pod light flashes seven times and go out.
19. Clear any diagnostic trouble codes that may have be set.
20. Verify proper operation of the HVAC system mode and temperature controls.
May this will give a hand.This is GM TSB's.
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