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Sounds like a blown fuse...Check your fuse block for the rear window defroster...If it is OK, it might be that the leads to the window defroster have been broken by many openings and closings of the rear hatch.
check fuse
check if power is reaching the heater
check if ground is ok
measure the resistance across the heater
if its a blown fuse- replace it
if no power reaches the heater and fuse is ok - measure if power reaches the fuse.socket then the switch for the heater and so forth
if there is poor ground or no ground - wire up a new ground or fix the old one
if there is too high of a resistance across the heater - look for broken traces and buy a silver trace pen (one made for repairing heater traces)
if there is too low of a resistance - look for a short circuit
you must listen when changing the temperature from cold to hot to see if you can hear the heater duct opening & closing,if not could be a vacuum hose is disconnected or broken,or the vacuum motor that moves the duct door has broken you might hear a hissing sound,or a cable has broken,I don't think it's a fuse ,because it's working when you turn it on,those are good possible causes I have given you have fun & I hope you have small hands,limited space acess
First check circuit breaker #8 and fuse #19 in the rear fuse panel. If these are OK, you will have to troubleshoot the seat heaters themselves (loose connector, broken wires, defective heater coil, etc.)
check the fuses the fuse for this can be found in your owners manual. if the fuse is good and the lite for the rear defrost lites up the rear heater strips on your rear window may be bad the only repair for that would be having the rear window replaced
Just a suspicion: hissing noise comes from failed/jammed/malfunctioning motor to move the door in the ducting to route heated air to the hoses/ports for "heater" and "defrost." Problem: failure of motor/linkage to heater/defrost selector door under the dash on the passenger side. Also sounds like you have not blown fuse to this selector door. Also - hissing noise could be air being forced against the closed door (which should be open) - in this case, you'd want to check the fuse to the heater/defroster actuator door. The rear heater works since its function is not related to the operation of the front heater/defroster.
Check Fuse #8 in the rear underseat fuse box, this fuse is also used for the power seats. The problem could also be the heater control module (located under driver's seat), a broken wire in the harness or loose connector under the seat. If it is not the fuse, then you will have to remove the driver's seat to check things out.
I have a 2004 CTS. I know there are two fuse boxes underneath the floor carpeting in front of the rear seat. Remove the rear seat bottom cushion and pull the carpet forward and you will see them. Inside the cover identifies what fuse is for what function. Hopefully it is a blown fuse, otherwise my guess would be a short in the wiring some where.
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