Question about 2003 Chevrolet Cavalier

1 Answer

Blower won't go to defrost on 2003 cavalier

I have lots of heat on my feet, but it won't go to defrost, knob bounces back. Is it a vacuum line or a cable control? I saw a previous post that claims it a cable control that is bent, and you can straighten it out. Others, have told me it is a vacuum line. Thanks, Lynn

Posted by on

  • renee90 Feb 02, 2009

    on mine it's a 03 too, but it's stuck blow air out of the vents. When I try to turn it to defrost it pops back.

  • nfn421 Feb 05, 2009

    Same problem. Knob wants to snap back and blow heat through the vents and not the vent for defrost


1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 1 Answer

This happened to my 2003 cavalier 2 times now both times we had to take it to the dealer they told us that the cabel broke both times works great after they fix it thank god for warenties

Posted on Feb 21, 2009

1 Suggested Answer

  • 2 Answers

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

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.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

What causes the ac to blow cold in the rear but warm air in the front?

These vehicles came with 2 types of ac controls.
The vacuum control system uses vacuum to actuate the vents and ducting from hot to cold. A lot of times the HVAC vacuum line in the engine bay (black hard plastic) is either broken or disconnected from its vacuum source.
The electronic vent control: does everything at the control knob via vent actuators and the control panel itself. With this one it could be any of the components. You would have to locate them and verify operation by moving temp/vent selector.

May 08, 2014 | 1997 Ford Expedition

1 Answer

Air will only come out defrost vents

Check your vacuum lines going into the car from the engine compartment dodge have really bad issues with this, could also be vacuum control valve behind dash on evap box.

Oct 14, 2013 | Dodge Dakota Cars & Trucks

2 Answers

My 2003 safari air vents are not working properly. The fan motor works in all speeds but air mostly only comes out of the defrost vent. What do I do. Thank you in advance. Jack

It sounds like vacuum is not getting to the vent, heat and A/C controls. Find the vacuum can. It may be under the hood on one of the inner fenders. The "one-way" check valve is usually located in the line and close to the can, make sure it works properly. The valve could be the very thing that's causing the problem. Trace the lines back to the vacuum block at the intake manifold or fire-wall, and also back to where the line goes thru the fire-wall. Check the can for leaks or obvious holes. They used to be just a plain metal can, but it could be a plastic ball. Check the lines as you go, for breaks and rub-thru's. Move the controls thru all settings and listen for vent door movement. Worst case is a bad vacuum motor or air flow position selector switch, and/or a faulty Blend Door Actuator. If you have been driving around with the Temperature knob or control set at the same spot for months, move it from fully cold to fully hot several times and wait for the air temperature to change each time. This will help reset the blend door and vacuum control system. Hope this helps... Let me know what you find.

Aug 24, 2011 | 2003 GMC Safari

1 Answer

When selector switch for ac/heat is in panel position it will blow thru vents until speed is increased then will blow only thru defroster. help!

Look for a vacuum line passenger side rear under hood near hood hinge area. Follow this line back to the intake manifold. checking for crack and leaks if any breaks in this line repair them this should fix your problem if not check all vacuum lines under the dash as well as the vacuum diaphrams that control heater door operations. if you have a hand vacuum pump you can check all these at (previous found) intake connection for the heat controls

Oct 17, 2009 | 1997 Ford Expedition

1 Answer

The heater control is stuck in the defrost and lower heat position. The knob turns but the air flow remains the same. I can not get panel airflow, full defrost, full heat,ect. Where do I start? The heat...

you are sure the knob is not stripped right all runs on vacuum look underneath and ensure they are all attached to the cluster on the knob as well check the vent itself and that the cable is not kinked preventing operation ..passengers side upper corner

Oct 03, 2009 | 1995 Oldsmobile Cutlass Supreme

2 Answers

Ventilation only moves thru window defrost ports no matter what setting of the control knob

pull knob off is it broken on back side? it may feellike its working but not if cracked

Aug 25, 2009 | 2002 GMC Safari

4 Answers

Heating / air conditioning control stuck to front defrost vents

There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.

Jun 19, 2009 | 1999 Dodge Durango

1 Answer

Heat will not blow down by my feet

Hi: On the back of the heater control unit are vacuum lines, make sure plug is firmly attached. FIRST though check if vehicle does not go into 4WD high. If not then you probably have a vacuum problem under the hood as vacuum controls heater, 4WD and other functions. Check to make sure vacuum lines under the hood are all attached starting with the vacuum pod (located in front L fender by brake module.) and chasing them under the hood. If you have vacuum then check heater control module and lastly heater door vacuum actuators. Hope this helps.

Feb 03, 2009 | 1998 Chevrolet Blazer

2 Answers

'04 Jeep Grand Cherokee: Heats...but only through defrost vents.

Check the control cable that operates the diverter door in the heater box at both ends, to make sure that it operates the door when you move the control lever.

Jan 15, 2009 | 2000 Jeep Grand Cherokee

5 Answers

AC knob wont switch all the way over to heat...

  1. so the knob is either broken or stiff to move and plyers wont turn all the the way to throw heat or cold air out for you.
  2. gently undo the two screws underneath your heater controls ( 2 screws)
  3. after that pull that peice out (there are no clips so it should be easy)
  4. after that is out you have more room to play with (getting your hand up behind the controls)
  5. now take the peice around the heater knobs and cd player off there are a few clips on this part so be careful not to break any but if gentle should come out easy.
  6. after thats off unscrew the cd player and unconnect the attena wire (small black wire hooked at far left of cd player) and the other radio harness.
  7. after that remove cd player out of the way.
  8. then you can see that your heater/ ac knob switch is controlled by a plastic arm try and push all the way to the left for heat and right for cold air. (this is one of the ways if they plyers arent working anymore)
  9. another place to look if your not getting the right results yet is underneath near the gas a break pedal to the right its a white plastic peice with another arm system in which you can either push toward the front of the car for heat or back to driver for cold air (may have them mixed up but either or should give results)
  10. re assembe and your good to go rather then a costly trip to the dealership if your just looking to stay warm in the winter or cool in the summer.

Dec 17, 2008 | 2002 Mitsubishi Lancer

Not finding what you are looking for?
2003 Chevrolet Cavalier Logo

Related Topics:

339 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

71288 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22059 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7009 Answers

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

Answer questions

Manuals & User Guides