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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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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 )
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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



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There are 3 fuses that control the rear defogger, and 1 relay

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