Generally, yes. It depends on the outside air temperature.
yes
The ac unit compressor will run when it is in defroster mode and heat setting is on.
If you have the defroster on the ac will run. It dries the air to help clear the inside of a foggy windshield quickly.
To help dehumidify the air
no, the truck was made to balance the air temp going threw the vech
Yes, it will run in the defrost mode. The only way you can keep it from doing that is to pull the fuse in the fuse panel.
Turn off the defroster.
comp may cycle when you have the defroster on
Yes, the windshield defroster will turn the A/C compressor on.
Many auto manufacturers engage the AC compressor when the defroster is used because the AC system also dries the air. In a humid environment the drying effect of the AC can help keep the windshield clear.
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.)
There are compressors with motors designed to run on DC. A compressor with an AC motor can't.