Question about 2004 Chevrolet Impala

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Defrost just one side works - 2004 Chevrolet Impala

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When you say defrost doesn't work, are meaning the blower or thermal defroster? If its the thermal defroster for the rear window this could be a fuse or the element has probably either stopped working or has come unglued from the window itself. This is a common problem. If its the blower for the front windshield defroster then it could very well be the actuator inside the dash that has malfunctioned and not opening when the selector is set at desired direction of circulation.

Posted on Oct 21, 2013

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My Winshield Defrost Quit Working. Heater, AC, and vents all working except the windshield defrost.


I'd have to check actuator movement for defrost. The actuator is electric according to my database. The actuator should be under dash at end of hvac housing.

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Same exact thing happened to my rear defroster on my 06 impala.
on the passenger side by the door molding there is a harness the connection my have melted like mine. I cut the wire on both sides of the harness and soldered them and put heat heal shrink wrap to seal the wires. And it workers perfect. The button will still control the defroster just like before.

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I have a 2002 Corolla GS. Rear window defroster not working


The main cause for the rear window not working is a disconnected wire at either side of the defroster grid. You can see where the body harness connects to the rear glass.

The second most liekly cause are broken defroster grid wires.

I would suggest to you to obtain a 12 volt DC testlamp, and check for voltage as follows, at the rear defroster.

Hook the clamp of the testlamp up to a known good ground. The back door latch 'hoop' is great. Next, turn on the rear defroster, and place the point of the tip on the extreme side of the back window, on the grid. Does it the tester light up bright? If not, try the other side.

The light, moving across the grid, should get noticeably dimmer, if the grid is functioning properly. The light will go out when you encounter a broken grid wire..

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Sounds like a possible defrost system failure,there are multiple components in the defrost system that can trigger this symptom(defrost heater,defrost timer,thermostats) if the freezer cannot go through the defrost process the frost will build up on the evaporator restricting air flow, the freezer will seem to work, but early signs will be fresh food section will start to get warm. Good luck!

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rear defrosters are an apllied film of semi metalic strips and if you get you windows tinted often the tint man accidentally nicks these strips cuasing the defroster to malfuction check for breaks in the srips

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Defroster won't blow air next to windshield


My son's jeep had the same problem. The actuator that controls the the defrost damper came out. Pull the radio out of the dash to gain access to the damper. Looking into the radio hold on the right side you can just see the arm. Move the heater control switch and you can see it moving around. I put a drop of instant glue on the end and pushed back in and its been fine.

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Try checking the connecting hoses to the drivers side defroster vents, i also had the same problem. And i noticed it helped a little if you put in on re-circulate instead of fresh.

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Defroster


FRONT DEFROSTER IS VACCUM OPERATED, ON PASSENGER SIDE REMOVE PANLE TO THE CENTER CONSOLE, YOU'LL SEE A CANISTES SHAPED IN TENNIS BALS IN SECUENCE, START THERE TO CHECK FOR VACCUM PROBLEM.
REAR DEFROSTER/WIPER/WASHER ON HATCH.OPEN REAR HATCH ON DRIVER'S SIDE HINGE YOU'LL SEE A WIRING HARNES GOIN THROUGH USUALLY THAT HARNES BRAKES , LOOSING CONTACT TO ALL OF THE ELECTRICALS IN HATCH DOOR, EASY REPAIR. REMOVE HINGE GET SOMETHING TO HOLD HATC OPEN, LIKE LONG BROOM.PULL OUT HARNES AND REPAIR.GOOD LUCK

Dec 14, 2008 | 1985 Volvo GL

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