Question about 2005 Chevrolet Chevrolet Cobalt Base

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My ac, heat and defroster not working. I hear air. Nothing out of vent at chest level. Vent on top of dash blows a little cold air. Controls not working like they should. Is it my resistor. I just changed the radio. What's wrong

Posted by Matt Moncure on

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2 Answers

Victor Scarpita

Victor Scarpita

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  • 101 Answers

Check wire on vacuum lines behind the radio may of gotten loose it sounds like the control for heat and cooling are unpluged.

Posted on Jan 15, 2015

  • 3 more comments 
  • Matt Moncure Jan 15, 2015

    Is the we're it connects to the control box

  • Matt Moncure Jan 15, 2015

    Is the we're it connects to the control box. Can it be control arms. I tried looking for by my gas pedal. How do I get to it

  • Matt Moncure Jan 15, 2015

    Is the we're it connects to the control box. Can it be control arms. I tried looking for by my gas pedal. How do I get to it

  • Matt Moncure Jan 15, 2015

    WhI checked is the heating and cooling wires

  • Matt Moncure Jan 15, 2015

    Which wires is the heating and cooling wires

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etep1958

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  • 59 Answers

Sounds like you may have pulled a vacumn line loose inside the dash when you where working on the radio. Most cars these days use engine vacumn diaphams to move the air duct flap in the HVAC system to direct the air flow to the different vent outlets. If a line is pulled loose the air flow flapper will not operate. Check for loose vacuum line around the vent control selector and around the blower motor air box usually found under/in front of the glove compartment.

Posted on Jan 15, 2015

  • Matt Moncure Jan 15, 2015

    Do I have to pull out glove box to get to this

  • Matt Moncure Jan 15, 2015

    Do I have to pull out glove box to get to this

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5 Related Answers

Anonymous

  • 20 Answers

SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Posted on Feb 23, 2009

localwonder

Michael Masters

  • 6784 Answers

SOURCE: Air conditioning fan makes loud noise the faster you ru it.

Concerning your broken vent -- this can be caused by a broken linkage or a malfunctioning servo motor as well. these vent have air ducts the sway back and forth to adjust the dual air flow function. if the servo o linkages are malfunctioning or not connected for some reason, it will not allow total control of the air flow and temperature range. Now, if you have a combination of a flow error and temperature error as well, thai can be caused by a combination of the two.

In this case, you will need to inspect the linkages as well as the servo motor function as well. in addition, i would test the air temp sensors for there operational value. they control the temp when you adjust the coll or hot function.

Concerning the Loud noise coming from the blower fan---

This issue can be caused by a misalignment within the blower housing or, it can also be caused by some minor damage within the motor itself, causing it to rotate in a erratic manner, in return, forcing it to rub against the housing itself. the best solution here is to extract this blower fan housing and inspect for lose fan propeller and motor stability. replace parts accordingly.

PLease rate and have a great day:)

Posted on Apr 22, 2009

Rick Lance

  • 12 Answers

SOURCE: air conditioning not blowing thru the vents

There is a black vacuum hose in back of the glove box toward the top connected to a gray hose about 1/8 thick.You need to check to see if there is vacumm there.If yes then you need to take the bolts off to be able to tip the dash back enough to see all the vacuum hoses.Make sure they are all connected.It was alot of bolts but its is the best way.I had a hose off going to one of the acuator doors.Glued it back on and works great

Posted on Jul 17, 2011

trish coley

  • 3 Answers

SOURCE: Heat wont blow through heater or defroster vents

Had the same problem. believe it or not i changed the gas cap and got heat all around. something about pressure.

Posted on Dec 07, 2011

emissionwiz

Marvin

  • 85239 Answers

SOURCE: 1999 temperature control will not regulate heat/air

This is likely caused by a failed or jammed electric air temerature control blend door actuator and or a warped and jammed blend door.

Posted on May 18, 2012

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1 Answer

2002 ford explorer AC and heat blowing in dash, but very weak from the vents
On the motorcraft parts web site, you can blow up
a picture of the HVAC Blend Door Motors & locations,
as well as part numbers

You can get failed motor from Amazon

With knowing where the motors are located, try switching
the air flow modes manually, to see what positions do not work

Then you know what motors to replace

I also have professional scan tool software & can see the codes
for the motors in enhanced data.

The-- Vent Blend Doors-by name

Defrost-up top
Cabin -the vents as you say in the middle & on the sides
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Blend Door -under the dash on your print

Mar 11, 2014 | 2003 Ford Explorer

1 Answer

Heater Core replacement
first, check the coolant level and add if its low..check for accidental ac turn-on at the controlls..then its an issue with the controls themselves provided the water pump is good..there are baffle doors that are controlled reemotely in the dash and one of these couldd be not functioning or blocked by debris like a penny sliding into the defrost vent will jam the door and keep it from working...check these and see...good luck..

Jan 15, 2013 | 1998 Mercury Mystique

1 Answer

My heater does not blow in floor in a dodgeram 1500
the heater vacuum motor and lines needs to be checked.Also get the blend door checked.

NO HEAT ON FLOOR VENTS

---------

As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html


------------

No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

------------

Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

-----------

Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------

Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

--------------

Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

--------------

No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

----------

Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

----------

Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

---------

Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

---------

Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

----------

2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html

-------------

2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

-----------

AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

----------

Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

----------


These will help.

Thanks.

Nov 28, 2012 | Cars & Trucks

1 Answer

No heat from vents

As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

------------

No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

------------

Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

-----------

Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------

Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

--------------

Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

--------------


No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html
----------

Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

----------

Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

---------

Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

---------

Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

----------

2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html


-------------

2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

-----------

AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

----------

Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

----------


These will help.

Thanks.

Nov 28, 2012 | 2006 Ford Taurus

1 Answer

Ac vents not working
There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

Jun 13, 2012 | 2007 Ford Sport Trac Limited

1 Answer

2000 Ford Taurus SEL ac/heat blows through floor and defrost vents only
There is no vacuum to the controls. Look for a vacuum hose that is no longer connected to the engine intake manifold and repair it.

Feb 15, 2018 | 2000 Ford Taurus

1 Answer

I have a international 9400i. i cannot change which vent blow air. cannot change to defrost. is there a valve that controls this? if so where is it located?
International 9400 9200 9900 heat box is under the passages side seat. That where the heater core location and the ac evaporator blower. You have two control motors under there one control the bunk for hot and cold. The other control front for hot and cold. Defrost vent and front vent is in the dash. My suck on defrost and in floor will open to front vent. I have not locate yet.

Dec 23, 2011 | Cars & Trucks

3 Answers

2004 Ford Expedition XLT, front blend door actuator
Hope I was avle to help, glad you up and going.

May 26, 2009 | 2004 Ford Expedition

1 Answer

Heat wont blow through heater or defroster vents
common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Jan 18, 2009 | 1997 Chevrolet K1500

2 Answers

No air, ac, heat out of in dash face vent
check the hoses connected to the vacuum advance ball, it has probably begun to decompose...

Aug 05, 2008 | 1996 GMC Jimmy

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2005 Chevrolet Cobalt Base

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