Question about 2003 GMC Sierra

1 Answer

Recently had battery replaced but when I got back into my truck, I had NO control on my HVAC from the inside. The heating and A/C default to the defrost mode and I cannot change to any other setting. Any Advise? Thanks

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 7,353 Answers

Unhook the battery for a few minutes. Now hook it back up, and turn the key on, but dont start the engine, let it set for 2 minutes, now start the engine and see if it works.

Posted on Nov 19, 2009

Testimonial: "I tried to unhook the battery for 10 min and hook it back up like you told me and it worked perfectly. Thank you so much for your help."

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

I have a 2001 LS 430. The heat and air conditioning only operates at either Maxim cold or maximum heat no middle ranges. The only way I've been able to control temperature inside my vehicle is by adjusting...


the heat control vent must be stuck in hot position , this is located at the back of the dash , i would suggest getting a mechanic to have a look as there is a lot to remove,unplug and put back together afterwards

Jun 09, 2014 | Cars & Trucks

1 Answer

HVAC Blower stopped working


The fuse you replaced powers the hvac control. The run relay is powered by a 30amp fuse in the fuse box near the battery.
Is the relay getting power from that 30amp fuse ?

Jul 10, 2013 | 2004 Saturn ION

1 Answer

Replaced battery on 2004 envoy, hvac stays cold on drivers side and hot on passenger side. Took battery terminals back off and waited 10 min.s and replaced did not help.


First set all HVAC controls to off or fully CCW positions, then disconnect battery for 10 minutes. Reconnect battery and don't touch any HVAC controls for a few minutes. If this does not work you may have a bad actuator or blend door.

Oct 10, 2010 | 2003 GMC Envoy

1 Answer

Heat blows out at floor only and ac does not come on even though light Indicates it's on. Has rear defrost and light works..Also has recirculating air button . I'm guessing the whole heating control in...


I would first remove the fuse for the heater control head for one minute and then put in and retry.
The control head could have locked up on you with a volt spike. The rear defrost switch does not go through the same circuit in the heat as the hvac controls. Could be a broken know also.
Could also be mechanical linkage on side of heater box above accelerator pedal may have broken or popped apart. or if electrical motor control may be actuator.

#76-11-01: HVAC CONTROL KNOB SPINS FREELY (REPLACE) - (Oct 9, 1997) 999999995.gif SUBJECT: HVAC CONTROL KNOB SPINS FREELY (REPLACE ALL THREE KNOBS)
MODELS: 1996-97 CHEVROLET AND GMC M/L AND G VANS 1995-97 CHEVROLET AND GMC C/K TRUCKS
CONDITION:
SOME CUSTOMERS MAY REPORT THAT ONE OR MORE HVAC CONTROL KNOBS SPIN FREELY, RESULTING IN LOSS OF FAN, TEMPERATURE AND/OR MODE OPERATION.
CAUSE:
THE KNOB'S PLASTIC INNER SHAFT MAY CRACK WHEN FORCED AGAINST ITS STOP.
CORRECTION:
IF ANY ONE OF THE THREE HVAC CONTROL KNOBS EXHIBITS THIS CONDITION, REPLACE ALL THREE KNOBS WITH NEW P/N 16268157.
PARTS INFORMATION:
P/N DESCRIPTION QTY 16268157 KNOB, HVAC CONTROL 3

Sep 27, 2010 | 1995 GMC Yukon

1 Answer

Dash board air conditioning vents not working. Defrost and vents at feet are working on 2003 Chevy Silverado, 1500 series. What could be the problem.


dealership has to repalce control unit and clear the trouble codes, a free fix is unpluging your hvac fuses, and disconnecting your battery for 3 minutes, and then reconnecting your battery, and pluging in your hvac fuse, ensure the controls are off so that the hvac can go through all its cycles to regain the correct positon. sometimes the control doors move out of indexed range and the computer doesnt know what position they are in, so they default to defrost. if yours isnt too far out of range you can go back to enjoying normal ac and heat, if it is too far out of range you can still have ac and heat just through the defrost postion.

Aug 09, 2010 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Chevy Trailblazer 2004 when i recently replaced my battery,and my ac compressor cuts on and off at stoplights and droppes the rpms too low to stay running


The throttle body needs to be cleaned, grime build up in the throttle body and throttle plate prevent the plate from closing completely and stalling the car. While cleaning the TB, disconnect the battery for about 30 minutes and set all HVAC controls to off position or fully counterclockwise. After reconnecting battery, do not touch HVAC controls, turn key to ON position but do not start, wait about 10 minutes then start.

Aug 08, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

I have 2001 Pontiac Bonneville My heat works but


Your passenger side temperature door actuator is bad. You can access the actuator by removing the glove box & hush panel. The actuator is on the side of the HVAC box. If you can gain access to the actuator watch the center of the actuator as you change the temp on the control head, if the actuator does not move it is bad, if it does, the door inside the HVAC box is bad. Most likely its the actuator. If you remove the actuator & open it up you will most likely find the large center plastic gear is cracked all the way through. It is held in place by 2 or 3 7/32 screws. Once you replace it, disconnect your battery wait 30 seconds and reconnect it to reset the HVAC control head so it can relearn your actuator positions. It can take up to 5 minutes for the control head to go through it's relearn procedure. You can try resetting the actuator first , but make sure your radio is turned off before you disconnect the battery and if your luck, the actuator may not have any broken parts and the gears may just need to be freed up and lubed. Good luck friend and hope this helps.

Oct 22, 2009 | 2001 Pontiac Bonneville

1 Answer

04 Tahoe AC blows hot air on drivers side but resets if restarted


A educated guess I would have to say there is a problem with HVAC control module ! electronics you know ! But that's not the way to do things ! There could be codes stored in the module. The Chevy dealer my have a reflash bulletin for this problem . Then can reflash , reprogram the control module ! The first place to start is checking for codes in the HVAC 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.
Air Temperature Sensors The air temperature sensors are a 2-wire negative temperature co-efficient thermistor. The vehicle uses the following air temperature sensors:
?€¢
Ambient Air Temperature Sensor

?€¢
Inside Air Temperature Sensor Assembly

?€¢
Inside Air Temperature Sensor Assembly-Auxiliary

?€¢
Upper Left Air Temperature Sensor

?€¢
Upper Right Air Temperature Sensor

?€¢
Lower Left Air Temperature Sensor

?€¢
Lower Right Air Temperature Sensor

?€¢
Upper Air Temperature Sensor-Auxiliary

?€¢
Lower Air Temperature Sensor-Auxiliary
A signal and low reference circuit enables the sensor to operate. As the air temperature surrounding the sensor increases, the sensor resistance decreases. The sensor signal voltage decreases as the resistance decreases. The sensor operates within a temperature range between -40?° to +101?°C (-40?° to +215?°F). The sensor signal varies between 0-5 volts.
The input of the duct air temperature sensors are different from the ambient and inside air temperature sensors. The HVAC control module converts the signal to a range between 0-255 counts. As the air temperature increases the count value will decrease.
If the HVAC control module or auxiliary HVAC control module detects a malfunctioning sensor, then the control module software will use a defaulted air temperature value. The default value for the ambient and inside air temperature sensors will be displayed on the scan tool. The default value for the duct air temperature sensors will not be displayed on the scan tool. The scan tool parameter for the duct air temperature sensors are the actual state of the signal circuit. The default action ensures that the HVAC system can adjust the inside air temperature near the desired temperature until the condition is corrected.
The ambient air temperature sensor mounts underhood and can be affected by city traffic, by idling, and by restarting a hot engine. Therefore, the HVAC control module filters the value of the ambient air temperature sensor for temperature display. The ambient air temperature value is updated under the following conditions: Or you can just buy a new control module an hope that it fixes it. $89.00 at www.partsgeek.com

Search from over 10 Million Auto Parts

Sep 18, 2009 | 2005 Chevrolet Silverado

1 Answer

I have a 2003 jimmy that blows very little heat at level 4


It sounds like it could be the control panel or the A/C And Heater Control Calibration you can give this info to your mechanic... but if i were you i would go to gm dealer.replacing the wrong part will get expensive fast..... hopes this helps you..........................................A/C And Heater Control Calibration
Re-Calibrating Actuators (Primary)
When replacing the HVAC control module it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC control module be sure to perform the following:Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.
  1. Place the ignition switch to the OFF position.
  2. Disconnect the scan tool.
  3. Install the HVAC control module.
  4. Connect all previously disconnected components.
  5. Start the vehicle.
  6. Wait 40 seconds for the HVAC control module to self-calibrate.
  7. Verify that no DTCs have set as current DTCs.
When replacing the HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process. When installing the HVAC actuator be sure to perform one of the following:Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted improper HVAC performance will result.
Alternate Method (W/O Scan Tool)
  1. Clear all DTCs.
  2. Place the ignition switch to the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Remove the HVAC B fuse for a minimum of 10 seconds.
  6. Install the HVAC B fuse.
  7. Start the vehicle.
  8. Wait 40 seconds for the HVAC control module to self-calibrate.
  9. Verify that no DTCs have set as current DTCs.
Preferred Method (W/ Scan Tool)
  1. Clear all DTCs.
  2. Place the ignition switch in the OFF position.
  3. Install the HVAC actuator.
  4. Connect all previously disconnected components.
  5. Start the vehicle.
  6. With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.
  7. Verify that no DTCs have set as current DTCs.

Dec 29, 2008 | 2001 GMC Jimmy

Not finding what you are looking for?
2003 GMC Sierra Logo

Related Topics:

86 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76109 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...