It is probably the sound of the defroster fan.
when the defroster is turned on, it activates the a/c compressor. the clutch may be locking up on the compressor.
The fans will probably stay on while the defroster is on because the A/C compressor is running.
comp may cycle when you have the defroster on
I believe they come on when the rear defroster is turned on
No. He dosn't. Besides it was Hawkeye that would have turned into one.
The most likely reason would be because you also have the defroster turned on with your heater. The defroster causes the A/C compressor to kick on which helps remove extra moisture in the air keeping your windows from fogging. The A/C compressor is linked to a "kick up" that brings the RPMs up to keep your engine from stalling due to the extra load possibly causing a surge.
The defroster is drawing more electrical current than the alternator can produce. It could be that the belt is slipping and the battery is margianally low so that when you turn on the defroster the alternator can't keep up and the battery isn't able to provide enough current to keep the ignition operating.
Turn the AC or the Defroster off.
The air conditioning will turn on with certain heater settings, typically any setting that mixes with the defroster. This to help remove moisture and improve the effectiveness of the defroster.
Turn off the defroster and see of the fans are on still. Also listen closely, do you hear the Air Conditioner on whenever the defroster is on? Cute huh? It ensures that your A/C gets turned on once in a while, to keep its seals lubricated.
Magnets that are turned on by passing an electric current through them, and turned off by not allowing an electric current through them.
Current flows through a wire when a light switch is turned on.
or any other car, mostly the AC removes moisture On my 2008 Corolla, the AC light does not light up when the defroster is turned on. However, it DOES appear that the AC compressor is used. (my 2008 is the same as 2003 thru 2007, it is not the redesigned Corolla which an 09 in the USA.)
Gas is turned into a liquid through condensation.
Theres a switch 2 buttons to the left of the defroster switch. That switch is to raise and lower you head lights without turning them on so you can change the headlights. The switch could have a short in it causing it to act like that.
Cooling fan should come on when coolant temperature exceeds 235 degrees Fahrenheit or A/C or defroster are turned on
The heated, outside rear-view mirrors will warm up when the rear window defroster is turned on. That provides for effective snow & ice melting from the mirrors.
When air conditioning or front defroster are turned on it will turn on A/C compressor which requires the A/C condensor to be cooled (via radiator fan).
Check to see if you've turned the defroster on. The AC runs in that mode to dehumidify air inside the car. Cheers
One of three things usually fails on a rear defroster. The switch can fail (it should have a light within the switch which should be illuminated when turned on). The tabs can break off the rear glass. Or the lines have "worn" off the glass. Both of these should be able to be repaired by a glass company for a small expense.
The horn of a 1994 Ford Mustang works when the car is off, but ceases working when one turns the key? Sounds like an electrical problem! Follow the wiring, or if one feels less than capable of the task, bring it to a licensed mechanic.
You might be low on power steering fluid
I had that happen once. It turned out to be an earthquake.
Cooling fan should come on either when coolant temperature reaches 235 degrees or the A/C or defroster is turned on