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I have had many problems with 2002 envoy. Fan blower stops workingall together. Fan never worked in 5 when moved to defrost or other positions s clicking noises starts. Radio may sound OK then stop. I just replaced a oxgen sensor a relay switch on my lights. All problems seem to be something in dash like maybe a short. Just need help.

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Not likely a "short," but more likely a bad ground. Check all of your ground wires and connections underneath the dash, and clean all chassis connections that show signs of rust or corrosion with penetrating oil.

Posted on Jun 11, 2014

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2002 GMC Envoy. AC fan stops completely. When moving position switch to defrost or front and foot position it sounds like a something is clicking in the vent.


which fan, there are 3 to 4 fans.
saying fan means zero. on cars.
did you know on modern car the PCM cranks up all fans ? on A/C demand? not just 1.?

my guess, the Dash heater/A/C HVAC blower fan dies. in the dash?
The dash sections here, have dampers.
they work one of 3 ways, vacuum, cables or motors. (or mixed)
the FSM covers this.
the damper can fail many a way, as can the fan and there controls.

A/c stops???
please tell what that means, sure cold air stops.
we get that.
but does the main blower work. at all speeds.>
if the blower stops the A/C air stops but also
the compressor goes offline (clutch)
if 12v power reaches a dead blower motor the compressor does not know this is true and keeps going, so if car is moving air does flow
non recir, and it does get cold, proving A/C works.
see?
The air flow is it stopping with blower making its normal air sound?
im guessing you are not taking the 3 fans on front end of car.
2 for engine rad fans and 1 more in front of A/c Condensor.
im not logging in to alldata.com to see fan counts.

the car came new with 2 HVAC options, automatic and manual.
im not guessing that either
the car came with optional aux blower too. long wheel base car>?
login to alldata.com and see this very complex system.
(get it serviced?)
here is one excerpt of the Manual system Acutators.
see this level of complexity, and the scan tool tests (dealer)
Auxiliary HVAC Control Module
The auxiliary HVAC control module is a class 2 device that interfaces between the rear seat occupants and the auxiliary HVAC system to maintain auxiliary air temperature and auxiliary air 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 auxiliary HVAC DTCs and settings will be erased from KAM. The auxiliary HVAC control module will perform a recalibration of the electric actuators when commanded with a scan tool or if KAM is lost. This will ensure the actuators are moving with in the calibrated range. During this calibration process the auxiliary blower motor will be disabled for up to 3 minutes.
Defrost Actuator
The defrost actuator is a 5 wire bi-directional electric motor that incorporates a feedback potentiometer. Ignition 3 voltage, low reference, control, 5 volt reference and position signal circuits enable the actuator to operate. The control circuit uses either a 0, 2.5 or 5 volt signal to command the actuator movement. When the actuator is at rest, the control circuit value is 2.5 volts. A 0 or 5 volt control signal commands the actuator movement in opposite directions. When the actuator shaft rotates, the potentiometer's adjustable contact changes the door position signal between 0-5 volts.
The HVAC control module uses a range of 0-255 counts to index the actuator position. The door position signal voltage is converted to a 0-255 count range. When the module sets a commanded, or targeted, value, the control signal is changed to either 0 or 5 volts depending upon the direction that the actuator needs to rotate to reach the commanded value. As the actuator shaft rotates the changing position signal is sent to the module. Once the position signal and the commanded value are the same, the module changes the control signal to 2.5 volts.
Mode Actuator
The mode actuator is a 5 wire bi-directional electric motor that incorporates a feedback potentiometer. Ignition 3 voltage, low reference, control, 5 volt reference and position signal circuits enable the actuator to operate. The control circuit uses either a 0, 2.5 or 5 volt signal to command the actuator movement. When the actuator is at rest, the control circuit value is 2.5 volts. A 0 or 5 volt control signal commands the actuator movement in opposite directions. When the actuator shaft rotates, the potentiometer's adjustable contact changes the door position signal between 0-5 volts.
The HVAC control module uses a range of 0-255 counts to index the actuator position. The door position signal voltage is converted to a 0-255 count range. When the module sets a commanded, or targeted, value, the control signal is changed to either 0 or 5 volts depending upon the direction that the actuator needs to rotate to reach the commanded value. As the actuator shaft rotates the changing position signal is sent to the module. Once the position signal and the commanded value are the same, the module changes the control signal to 2.5 volts.
Auxiliary Mode Actuator
The auxiliary mode actuator is a 5 wire bi-directional electric motor that incorporates a feedback potentiometer. Low reference, 5 volt reference, position signal, and two control circuits enable the actuator to operate. The control circuits use either a 0 or 12 volt value to co-ordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 0 volts. In order to move the actuator, the auxiliary HVAC control module grounds one of the control circuits while providing the other with 12 volts. The control module reverses the polarity of the control circuits to move the actuator in the opposite direction. When the actuator shaft rotates, the potentiometer's adjustable contact changes the door position signal between 0-5 volts.
The auxiliary HVAC control module uses a range of 0-255 counts to index the actuator position. The door position signal voltage is converted to a 0-255 count range. When the module sets a commanded, or targeted, value, one of the control circuits is grounded. As the actuator shaft rotates the changing position signal is sent to the module. Once the position signal and the commanded value are the same, the module grounds both control circuits.
Auxiliary Console Mode Actuator
The auxiliary console mode actuator is a 5 wire bi-directional electric motor that incorporates a feedback potentiometer. Low reference, 5 volt reference, position signal, and two control circuits enable the actuator to operate. The control circuits use either a 0 or 12 volt value to co-ordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 0 volts. In order to move the actuator, the auxiliary HVAC control module grounds one of the control circuits while providing the other with 12 volts. The control module reverses the polarity of the control circuits to move the actuator in the opposite direction. When the actuator shaft rotates, the potentiometer's adjustable contact changes the door position signal between 0-5 volts.
The auxiliary HVAC control module uses a range of 0-255 counts to index the actuator position. The door position signal voltage is converted to a 0-255 count range. When the module sets a commanded, or targeted, value, one of the control circuits is grounded. As the actuator shaft rotates the changing position signal is sent to the module. Once the position signal and the commanded value are the same, the module grounds both control circuits.

if a real DIY person, why not buy the FSM and not try to work ALL THAT and more blind.?

May 14, 2014 | Cars & Trucks

1 Answer

2002 GMC Envoy Blower fan seems to work fine but little air coming from the vents. It seems like the air is spread throughout all the vents including defroster. Where should I start?


The problem is most likely one or more of the mode control actuators or the doors that they drive. Sometimes the doors bind or else the actuator gears break. Unfortunately, these parts are not that easy to get to. Some of the parts can be accessed from under the dash after removing some panels, others are buried. Attached is a diagram of their locations.

freddyboy61_9.jpg

Aug 07, 2011 | 2002 GMC Envoy

1 Answer

The blower on my a/c on 2002 chevy trailblazer only blows from the floor vents and the defroster vents but not the dashboard vents how can this be fixed. Also, it only works on 5


It sounds like you have two problems. First a question though; Is your heating and air conditioning control on the dash automatic (has two knobs that rotate and a display screen in the middle), or manual (has two levers that move up and down for driver/passenger temp and a separate fan knob and mode knob).

In response to the vents being stuck on defrost and floor, from experience i can say that the most likely cause is the mode actuator has failed. If your battery has recently gone dead, that could have brought the problem to the surface. When the battery has gone dead, the heating and air conditioning controls relearn all the positions of the actuators behind the dash when the vehicle has been re-started. If there is a position sensor failing (which happens quite often) in one of the actuators, the heating and air conditioning controls won't be able to learn the correct position of the actuator and (in your case) defaults to the defrost/floor position.

The only way to fix that would be to replace the actuator. I would like to know what type of heating and air conditioning controls you have (manual or automatic) before i say anything on the blower only working on 5.

Aug 05, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

2002 GMC envoy slt 4.2 v6 My question is.. I recently changed the water pump on my wife's envoy. After replacing it the car idles low and high, low and high constantly. No normal idle like before. I...


Sounds like you may have disconnected the battery. Does the rough idle only happen when the defroster or A/C is on? If so clean your throttle body with throttle body cleaner with the battery disconnected. When finished, drive it for 5 or so miles with the defroster / AC off to let the computer relearn the settings. This will solve your problem.

Dec 21, 2010 | 2002 GMC Envoy

1 Answer

My air conditioner fan speeds have all stopped working except for 5. Any ideas what is causing this? The vehicle is a 2002 GMC Envoy.


Yes,it is the blower resister,it controls all the speeds to the blower motor,it is located near the blower motor,and it might have a wire harness that is burned up too,replace it,and the wire harness,and the blower motor,the blower motor is what causes the resister to fail,it draws too many amps,even though it might sound good,and run fine,it is requiring to many amps to run it.If this was at all helpful,please rate,thank you.

Jul 24, 2010 | 2002 GMC Envoy

2 Answers

The blower speed switch only works on 5. The


this problem is caused by a defective blower speed control resistor, it is located near the blower motor, very cheap to replace, part is around $35

Oct 26, 2009 | 2002 GMC Envoy

1 Answer

2006 GMC Envoy and the A/C fan wont work in number 5 position


replace the resistor 4 the blower motor that should slove that hope this helps

Mar 05, 2009 | GMC Envoy XL Cars & Trucks

2 Answers

Heater blower not working on 2005 Envoy


It sound like to control panel switch. Can you get to the back of the control panel??? If so, bypass the switch, and connect the two wires with a jumpper wire to see if it start blowing????

Feb 04, 2009 | 2005 GMC Envoy

1 Answer

2005 GMC Envoy SLE blower fan speed #5 is not working


More than likely this should just be your resistor. You have different sized coils on the back of your resistor for all the different fan speeds. if one of them burns out or breaks then that certain speed will not work.

Feb 03, 2009 | 2005 GMC Envoy

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