Question about 2003 Chevrolet Cavalier

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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

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  • 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

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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

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


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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.

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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!


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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.

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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.

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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.

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