1. Check the fuse. 2. Check for damage to the wires coming from the body to the hatchback. 3. Check the switch for power on both sides when it is ON.
Check that the wire on the rear defroster is connected to the defroster. If broken off repair it.
Finding the logical connection would not be very helpful in working out an analogy.
Bad fuse
This was my question- I went to the dealership- there was mud/dirt on the fan. This made the car shake when the heater/air conditioner was turned on. All they did was spray the fan off with a garden hose. It works perfect now!
Happiness Kindness and being able to share with others
Working at a pet store. Trust me, it helps
A 1997 Pontiac Sunfire would have a voltage regulator and it would be found inside the alternator.
Those danged rear window defrosters are wonderful when they work. They are pretty fragile and if just one of the little wires in the glass becomes damaged, you're done. Try opening the trunk and if you have to, climb inside. There has to be an electrical connection in there which goes to the defroster grid. It might have come loose. Or, it might have dirty contacts. Shoot it with a little contact cleaner or WD-40 and try it again. If you can indeed get at that connection in the trunk, try turning on the defroster switch and check for voltage at the connectors with a voltmeter. If you have voltage there but the defroster still doesn't work, it points to a problem in the glass. If you have NO voltage there, it would point toward the cabin and the defroster switch or the wiring from the cabin to the trunk.
The diverter, or blend, door, is not working properly, The door is either feeding the heat through the defroster, or closing the heat completely off.
check the fuse Look for a freyed or degraded wire with the rear door open. Located where the door joins the body at the top.
temperature gauge not working can be caused by a bad temp sensor in engine, a bad gauge in dash, or a bad fuse
Most of the Sunfire vehicles do not have a plug in for the cold. If a 2002 Sunfire had an aftermarket block heater installed, the cord for it would be located in the front bumper.