Question about 2004 GMC Sierra

1 Answer

I have a 2004 GMC duramax. I recently had to change both my batteries and after doing so my a/c and heater will only blow air through the windshield vents. When I select a/c it dose blow cold air but when I select it to vent through the dash vents or onto the floor it only continues to blow onto the windshield. Same with the heat. I don't know if this could possibly have anything to do with changing the batteries but it's for sure I didn't have this problem until the Batteries were r&r. Appreciate any help...Rick

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I believe there is a small motor with 2 springs in the below dash duct work, it may be right above the gas pedal (but I am not 100 % sure) it
contols where the air flows in the ducts. Some what of a damper affair. I have the same problem in my 95 Tahoe, it just seems to stick and often lets go after a few minutes. You may need to give it a little persuasion, but do it carefully because you may drop the two springs off and it may mean pulling the dash out. Lay on you back and locate the motoer and get a helper to move the setting from dash to foor to vent , but give about 45 seconds between each move give a little pull. WD 40 may help but just a liittle.

hope this may help Ron

Posted on Aug 06, 2010

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:

1 Answer

2004 gmc 6.6 litre duramax plus change themasat


their are two follow top rad hose to engine that's it, don't forget to bleed out air after install top of turbo to

Feb 18, 2015 | GMC Cars & Trucks

1 Answer

Long time before heater blows warm air


That seems pretty normal, the heater works by blowing excess heat from the engine coolant. So the coolant has to be warmed completely for the heat to work, you can get a heater that plugs into your cigarette lighter that will heat the vehicle instantly.

Nov 12, 2013 | 2004 Chrysler Town & Country

1 Answer

2004 chrysler pacifica heater controls won't change


Under the dash drivers side there are mode motors that control where the air comes from replace bad one or both the bottom one is recirculate. You could take a volt meter and see which one has power when you push button

Dec 23, 2011 | 2004 Chrysler Pacifica

1 Answer

I have a 2004 gmc envoy and we recently changed batt , and now the a/c want blow thur the front vents but blows thru the floor and defroster fineand we put a new acuator on and now it want blow thru the...


Try recalibrating the HVAC system first. Set all HVAC controls and switches to their OFF or CCW positions, then disconnect battery for a couple of minutes, reconnect battery and don't touch any of the HVAC controls for 2 - 3 minutes. If this does not correct the problem, you may have a stuck blend door or another bad actuator.

Jul 26, 2011 | 2004 GMC Envoy

2 Answers

2004 impala..The heater blows cold air when at idle or when i stop at a stop sign. When I am driving the heater is blowing hot air. the antifreeze level is OK and the engine is at operating temp. Any...


A couple of things come to mind. One is the thermostat is hanging open. The other is the cooling fans are running when they shouldn't. With the car idling, open the hood and see if the fans are blowing. Do you have a temperature gauge in the dash? Should be reading about 200 degrees all the time. Maybe a little less at highway speeds but not below 190 degrees.
The other thing is the heater core may be plugged. Have you changed the anti-freeze and flushed the system recently? Added any StopLeak to the radiator?
Also... if the heater temp controls are activated by vacuum (I'm not sure on your model), you may have a leaky vac hose to the heater control panel.
Could be any of these and could something else. I tried to hit the obvious ones... :)

Good Luck.

Nov 23, 2010 | 2004 Chevrolet Impala

1 Answer

I have a 2004 GMC Envoy. I recently changed my battery and ever since it was replaced my air conditioning hasn't worked right. It does not blow on the face, only on the feet and on defrost. Please...


when the batery was replaced the vacuum source that controls the venalation system was broken or disconected. look under the hood to see if you can find a little vacuum hose that is broken or disconected. you might be able to hear it "hissing" as a good way to find it...

Nov 20, 2010 | 2004 GMC Envoy

1 Answer

A/C and Heater will not blow air..


Blower motor resistor is most common ($20-$70) it controls the blower motor fan and speeds or fan relay fuse (usually under the hood) If it's not either then the blower itself is bad. You can pull the motor and apply 12volts to it to test, if it spins then the resistor.

Oct 02, 2009 | 2001 GMC Sierra Crew Cab

1 Answer

2004 Yukon. driver side air conditioner not working


you need to change drivers side temp door actuator then disconnect battery for 5 seconds and reconnect after changing the part, turn key on for 60 seconds with touching heater control to allow actuator to program and then it will work.

Sep 19, 2009 | 2004 GMC Yukon

2 Answers

Air flowing thru front vents


I just changed my battery as well in my 04 Envoy XUV and the air on the passenger side would not blow. The air has since returned after I restarted but the flow on the bottom has been out for some time even before the battery change.

Jul 23, 2009 | 2004 GMC Envoy

5 Answers

Heater blows cold air


the electric motor that open the heat door looses electrical connection there by the door stays on cold / it is located under the a/c heater assembly / which requires removing the whole dash and heater assy// also bleed all air out of coolant system
there are three doors / 1/ a/c heat 2/ mode /defors 3/ recurculation dodgeboy6069@yahoo.com

Jul 19, 2008 | 2004 Jeep Wrangler

Not finding what you are looking for?
2004 GMC Sierra Logo

286 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76164 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...