Rear defoster on my 2007 equinox will not melt morning frost. The window defroster never worked but the car is garage keep so the usage over the last two winters is minimal. Brought car in before warrenty ran out and the window tested good with a voltmeter done by the dealer.
With the window frosted up from the night frost I started the car, trun on the rear defoster, and let the car run for 10 minutes.
The light in the switch was lite the full time but no frost was melted. Not even the frost by the heater line in the window. Returned to dealer and the dealer retested with voltmeter which show window working. I did get charge $120.00 for the troubleshooting time.
and ruRear defoster tested good with a voltage test, by dealer but does not defrost morning frost with 10 minutes of running. work on my 2007 equinox.
Comment from the FIxYa Moderator Staff...
Get yourself a 12 volt testlamp. Connect the clamp to one of the terminals on the rear defroster, either side. Next, touch the pointed end of the testlamp towards the other side of the glass.
Then, repeat the procedure, clamping the clamp on the other side terminal.
If you have a bright light all of the way across, you do not have a ground
If you have no light at all, you have no voltage
If the light gets dimmer, the farther you move away from the clamped terminal, the grid is operating normally.
Why did they charge you for 'diagnostics' when you know darn well it does not work? It is under warranty, correct? It is their obligation to find the problem and fix it AT NO COST TO YOU!
Amazing that they can get away with charging that much for what should take under ten minutes to do!
If the heating grid is intact (checked with an ohmeter or continuity tester) and there is power at the grid connections, with a good ground, there is no reason that it should not work. What you did not mention is if left on and standing if the frost ever melts if given more time. (voltage may be present but may be low) The grid needs full battery voltage to operate correctly! If you have a volt meter available you can easily check it yourself.
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