2004 Chevy Cavalier Defrost

Tiny
ANDREACHICKIE
  • MEMBER
  • 2004 CHEVROLET CAVALIER
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 60,000 MILES
My Cavalier's defrost knob turns all the way to the defrost setting, but it doesn't actually click over to defrost, and it doesn't run. What can I do to fix this?
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Thursday, October 30th, 2008 AT 1:49 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi:
When you say it doesn't run, do you mean the blower motor doesn't work?

As far as the defroster, you will need to remove the face plate covering the control unit (switch) and remove the switch to see if anything is disconnected or broken.

Let me know what you find, or if you have any other questions.

Joe
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Friday, October 31st, 2008 AT 10:46 AM
Tiny
ANDREACHICKIE
  • MEMBER
Well, i'm pretty sure the blower motor works. I had it replaced last year. Air just doesn't blow out of the blower that's up top by the windshield.
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Friday, October 31st, 2008 AT 12:39 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi Again:
If the blower is working and the air won't come through the defroster, there is a problem with the blend door. It is a plastic door which directs the air flow in different directions. What will need done is the face plate will need removed from around the heater control. That doesn't sound like much to do, but the air bag becomes an issue. Any time the air bag is an issue, I recommend that the owner take the vehicle to a certified mechanic.

If you still want to do it yourself, I recommend that you purchase a manual for your car. It will list step by step instructions and provide pictures for part identification.

I hope this helps you.

Joe
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Friday, October 31st, 2008 AT 1:33 PM
Tiny
MRSPARKLE
  • MEMBER
I own a 2003 and a 2004 cavalier. Both have had this problem with the defrost when it is cold. The defost damper is controlled by a stranded wire push/pull cable that is connected to a lever controlled by the vent position knob. It is a bad design because with increased friction of the damper when it is cold the stranded wire cable kinks instead of sliding into the cable sleeve to actuate the damper to the defrost posiiton. The cable is located under the dash above the end of the floor console. To get the best view, lie into the passenger area with your head on the floor mat. To fix this simply pull the ring end of cable off the lever attachment and straighten the cable then reattach it. For a permanant fix, straighten the cable and apply plumbers solder flux to the cable strands near ring end. Then with a pencil soldering iron melt solder into the strands next to the ring end for about 3/4 inch. Apply just enough solder to melt into the stands but not bubble or drip. This will stiffen the cable strands and prevent it from kinking again. Attach the ring end to the lever after it is cool.
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Tuesday, February 9th, 2010 AT 6:25 PM

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