Question about Chevrolet Cavalier

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I have a 2000 Chevy Cavalier the heater and the rear defogger doesnt work both quit working at same time

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  • mcintire776 Jan 17, 2009

    yes i have checked both fuses and they are good i have power to the fuses also i also changed the blower motor

  • Anonymous Jan 30, 2009

    not much air comingt out of vents, blower motor is good

  • Jeremy Stringer May 11, 2010

    have you checked the fuses?

  • Anonymous Mar 31, 2014

    rear defogger does not work

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Try taking a hose off the heater core for the front heater to see if your core is blocked, this might indicate a core cleaning.  As for your rear window defogger, the wire that usually feeds the  heater might be severed or cracked and you might not get a proper contact. Take the small plug off the heater strip and stick an Ohm meter on it to see if you have an open or closed circuit.

Posted on Jan 23, 2009

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Posted on Jan 02, 2017

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1 Answer

My rear defroster won't work I have a 2000 Buick Park Avenue


Could be a bad relay !
The rear defogger circuit is protected by a 40A fuse. Voltage is supplied through the fuse to the rear defogger relay. When you press the rear defogger switch, the heater and A/C programmer sends a class 2 message to the body control module (BCM), to ground the rear defogger relay coil output circuit. This in turn closes the relay contacts allowing current to the rear window grid.
Do you know what a class 2 message is ? What a BCM is ?
HTD BK relay in rear fuse box ,location In the center right rear of the passenger compartment, under the rear seat cushion
Watch this video on testing from relay base ( where it plug's into )
Do
VEHICLE RELAYS Testing from the relay base

Oct 05, 2016 | 2000 Buick Park Avenue

1 Answer

My heater only works some of the time and my rear defrost dont work what could be the problem


As by heat only works some of the time , you mean it doesn't blow air out of the vent's . This means you probably have a problem with the blower motor or blower motor resistor or blower motor relay .
Rear Window Defogger Inoperative

    Exchange the rear defogger relay with a known good relay from the under hood junction block.
  1. Turn the ignition switch to the ON position.
  2. Press the rear defogger switch to the ON position.
Does the rear defogger grid warm?
--
Yes Go to Step 2
NO Go to Step 3

2

Replace the faulty relay.
Is the repair complete?
Go to Defogger System Check --

3

  1. Use a fused jumper wire in order to backprobe between terminal A4 of underhood junction block connector C3 and ground.
  2. Use a test lamp in order to backprobe between terminal C5 of underhood junction block connector C3 and ground.
Does the test lamp light?
--
Go to Step 4
Go to Step 23

4

  1. Use a test lamp in order to backprobe between terminal C5 of underhood junction block connector C3 and ground.
  2. Press the rear defogger switch to the ON position.
Does the test lamp light?
--
Go to Step 5
Go to Step 14



Mar 23, 2016 | 1999 Oldsmobile Alero

1 Answer

Power windows, rear defogger and exterior mirror defogger quit working


IF you checked the fuses and relays, them it sound like it might be wiring or wiring connector might be loose.

Jan 05, 2013 | 1994 Isuzu Trooper

1 Answer

My 2004 6cfl. Trailblazer rear window defroster is not working. The wires appear to be making a good contact. The outside mirrors defrost ok using the same switch as the test window defroster. Is there...


There is a module that controls the rear window defogger grid . LGM/ EGM Liftgate or endgate module .Receive's message on class 2 serial data network from the HVAC control module to turn it on when button pressed . Fuse # 3 30 amp located in the rear fuse box . Do you know where the rear fuse box is ?
Rear Window Defogger Description and Operation
Rear Window Defogger System Components
The rear window defogger system consist of the following components:
• HVAC control module
• Liftgate module (LGM)/endgate module (EGM)
• Rear window defogger grid
Rear Window Defogger Operation (With LGM)
Battery positive voltage is supplied through the LGM 2 fuse to the LGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the LGM to enable the rear window defogger. The LGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.
Rear Window Defogger Operation (With EGM)
Battery positive voltage is supplied through the EGM 2 fuse to the EGM for the rear window defogger system. When the rear window defogger switch is depressed, the HVAC control module illuminates the rear window defogger indicator, and sends a class 2 message to the EGM to enable the rear window defogger. The EGM enables the rear window defogger by allowing battery positive voltage to the rear window defogger.
The following conditions must be met for rear window defogger to operate:
• The end gate glass position is not below the index position.
• The window express down movement is not requested.
• The window down movement is not requested.
If the end-gate glass is not fully closed, the DIC displays "Tailgate Glass Down" when the rear defogger operation is attempted.
When the rear window defogger switch is pressed for the first time, the defogger cycle lasts 10 minutes. Further operation results in 10 minute defogger cycles.

Fuse Block - Rear
Beneath the left rear seat

Jul 13, 2017 | Chevrolet TrailBlazer Cars & Trucks

2 Answers

Rear defrost won't workon cavalier


The Cavalier suffers from the infamous Purple wire problem. when you have this problem, the light comes on and timer works but there is no power at the rear elements. Cause is in the connector on driver's side, behind the carpet near hood release. Pull this carpet down and locate the Purple wire going into a green plug...press center of plug to open. Likely the contact is blackened inside, that is cause of the problem. You have two choices...clean the contacts and put plug together and defogger will work, for a while. I took the Purple wire out of the plug and soldered it to the black wire on the other side of the plug...make sure you get the right two wires. Look at the plug. The plug causes a high resistance contact and no voltage gets to rear. To prove it, disconnect one terminal at the window and measure 12Volts, connect the wire and the voltage disappears. Basic Ohm's Law. The plug contact is getting all the voltage. Don't let anyone tell you that you need a new switch, if the light/timer work. That won't fix it.

Jan 31, 2010 | 2000 Chevrolet Cavalier

1 Answer

REAR DEFOGGER NOT WORKING 2000 OLS ALERO


There's a junction box behind passenger rear door that has 2 wires that are joined from the front and control the rear defroster and radio antenna.

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1 Answer

Instrument panel guages don't read accuratly


I have a chevy cav 03 and my problem is just in the gas guage and temp guage now i cant seem to figure out how to fix it but for a quick fix i have jut been pulling out the instrument panel fuse and putting it back in it seems to fix t

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1 Answer

2003 Envoy Both the rear windshield wiper and defogger quit


Have you checked the wire harness that goes between the hatch and the body? The constant opening and closing weakens the wires. Could also be the ground wire, I believe is inside the hatch. It could have come undone. If you have an owners manual, it should guide you to the defogger fuse. Hope this helps. Best wishes.

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