Question about 2003 GMC Envoy Xl

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Blower motor continues to run when vehicle is off

Need to find the location of the blower motor control module for a 2003 Denali

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Your problem is the Relay which is encased inside the Heater/AC Resistor Module. This is a very common problem with GMC and Chevy Trucks. The Relay's return spring fails and the relay is held closed by gravity. The only fix is to replace the Resistor Module. I have a 2004 Silverado and have replaced the Module 3 times and the Blower Motor twice. The Orange wire feeding the Module is always Hot (12V) and feeds the Relay Contact for Highest Blower Speed. Hence the Blower runs all the time even with the Key off and removed.

Posted on Oct 21, 2009

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It is located on the outside of the air ducting just off from the blower motor. Hope that helps.

Posted on Oct 14, 2009

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1 Answer

My 2003 Yukon Denali no longer blows air from the front Front air vents


Do you know how to do automotive electrical testing ? Videos on youtube showing how to do it . Does your Yukon have manual or automatic Heater/AC system ? Could be the blower motor is bad , blower motor control module (if automatic ) Do you hear the blower motor running ? 2005 Chevrolet Tahoe Blower Not Working Chevy GMC same thing

Dec 04, 2016 | 2003 GMC Yukon Denali

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Blower stays on after key is removed, now a/c works in front once I hit the highway.


Which of these systems does your vehicle have ?
HVAC Systems - Automatic
Blower Motor Control Processor
The blower motor control processor controls the speed of the blower motor by increasing or decreasing the voltage drop on the ground side of the blower motor. The HVAC control module provides a voltage signal to the blower motor control processor over the blower motor speed control circuit. As the requested blower speed increases, the HVAC control module increases the amount of time that the speed signal is modulated to ground. As the requested blower speed decreases, the HVAC control module decreases the amount of time that the signal is modulated to ground.

HVAC Systems - Manual
Air Speed - Front Control
The blower motor forces outside air into the vehicle's interior. The vehicle operator determines the blower motor's speed when the driver places the blower switch in one of 5 blower speeds. The blower motor will always operate in any switch position other than OFF, as long as the ignition switch is in the RUN position. The blower motor and mode switches are located within the HVAC control module. The blower motor OFF input is connected in series with the HVAC control module by the off blower motor control circuit.
Depending upon the selected speed, power is provided to the blower motor from either the ignition 3 voltage or battery positive voltage circuits from the fuse block. The battery positive voltage circuit only provides power when the High blower switch position is selected. Power and ground are provided to the HVAC control module by the ignition 3 voltage and the ground circuits.
Low Blower Speed
When the Low 1 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the low blower motor control circuit. Voltage is divided between 4 series resistors, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
Medium Blower Speeds
When the Medium 1 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the medium 1 blower motor control circuit. Voltage is divided between 3 series resistors, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
When the Medium 2 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the medium 2 blower motor control circuit. Voltage is divided between 2 series resistors, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
When the Medium 3 blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the medium 3 blower motor control circuit. Voltage is divided between a series resistor, a blower relay, and the blower motor to achieve the desired blower speed. The blower motor is grounded through the ground circuit.
High Blower Speed
When the High blower speed is selected, the HVAC control module applies voltage to the blower motor resistor assembly through the high blower motor control circuit. The voltage energizes the blower relay, causing the blower motor to be connected directly to the battery positive voltage circuit. The blower motor and blower motor relay are grounded through the ground circuit.

HVAC Control Module
The HVAC control module is a class 2 device that interfaces between the operator and the HVAC system to maintain air temperature and distribution settings. The battery positive voltage circuit provides power that the control module uses for keep alive memory (KAM). If the battery positive voltage circuit loses power, all HVAC DTCs and settings will be erased from KAM. The body control module (BCM), which is the vehicle mode master, provides a device on signal. The control module supports the following features:

Feb 09, 2018 | 2005 Chevrolet Tahoe

1 Answer

Blower continues to run even after car is turned off. The blower always runs except when I pull the fluse out, is there also a relay and if so whcih one?


Hello and welcome. this is caused by the blower resistor also called a blower control module. you will need to replace the blower resistor. it is mounted under the passenger side of dash next to the blower motor

Oct 28, 2010 | 2006 GMC Yukon Denali

1 Answer

Blower runs all the time even when off on 2003 envoy


there is a part know as the blower module on most gm vehicles. It is located on top of the blower motor housing.; unplug it and see if the blower shuts off. They had that problem with a lot of the cadillacs. The module was located under the hood next to the firewall. I do not know where yours is located, but I hope this helps.

Jun 25, 2010 | 2003 GMC Envoy Xl

2 Answers

GMC Yukon Denali XL Auxiliary Blower Motor Battery Drain


Could be that the switch itself is shorting and allowing power to flow,if you can get to the switch I would use a voltmeter and see if there is voltage on the output side with the switch off.

May 14, 2010 | 2003 GMC Yukon Denali

1 Answer

Blower motor stays running ,can't shut it off ,on my 2003 envoy 4,2,it's has dual climate controls , with blower controls on the steering wheel as well as on the dash.please help with the location of the...


you need to check / replace the blower speed resistor module that should take care of the problem it is located lower evaporator case right hand side very bottom by the blower motor.

Nov 04, 2009 | 2002 GMC Envoy

1 Answer

2003 yukon denali---relay locate for blower


the relay is built into the speed resistor or motor control module ) depends if you have automative or manual heater controls. is automatic it will be motor control module and manual is the resistor module. these units are located beside the heate fan motor. the motor helps keeps the unit cool. just unbolt the module, unplug it and install new one. Just check to make sure the connector is good.. The heat created by the connection sometimes melts the power or ground leads (red or black) and if this is so you will need to replace the pin.

Sep 01, 2009 | 2003 GMC Yukon Denali

1 Answer

Heater blower motor


these vehicles have a heater control resistor mounted to the heater box. This is the module that is used to reduce the speeds to the blower motor. you will need to replace it. it is located next to the blower motor,

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1 Answer

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