I have a 2005 impala with the 3.4 V-6. The ac/heat blower motor is stuck on one speed and will not turn off unless I pull the 30 amp fuse from under the hood. I have had it looked at and was told to replace the relay and resistor module right beside the blower motor under the dash. I have done this and the blower is still running all the time, even with the car turned off.
You most likely have an internal shorted circuit in the HVAC control module.This should help you ,the module has to be programmed after replacement.
Heater and Air Conditioning Control Replacement
Important: The key should be in the off position when connecting the electrical connectors to ensure proper calibration.
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.
Tighten Tighten the screws to 1.8 N·m (16 lb in).
Important: Do not adjust any controls on the HVAC control module while the HVAC control module is calibrating. If interrupted improper HVAC performance will result.
A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
Thanks for the advice. I will have to try this and hope it corrects the problem.
Ok,I hope you have a good day.HAPPY NEW YEAR !