Kizashi Club

When I turn on front defrost it turns on ac anyone know why

That's the stupid way they designed it, I absolutely hate the A/C/heat system.

Yes very weird I thought mine was broke or something

Jacob1234 wrote: ↑Fri Jan 07, 2022 3:06 pm When I turn on front defrost it turns on ac anyone know why

This is how the defrost function behaves in nearly all vehicles with AC, even if it doesn't indicate it. The vehicle is using the AC to remove moisture from the air to prevent condensation or frost from forming on the inside of the windows, and to help remove it efficiently if it has.

bdleonard wrote: ↑Fri Jan 07, 2022 8:56 pm

Jacob1234 wrote: ↑Fri Jan 07, 2022 3:06 pm When I turn on front defrost it turns on ac anyone know why

This is how the defrost function behaves in nearly all vehicles with AC, even if it doesn't indicate it. The vehicle is using the AC to remove moisture from the air to prevent condensation or frost from forming on the inside of the windows, and to help remove it efficiently if it has.

This is correct as air conditioners function as dehumidifiers. In fact, I've heard of people getting docked on their DMV driving test for not turning on the A/C for defrosting a windshield. While I think that is extreme given A/C isn't necessary in all cases, the defroster does function better with the A/C on, especially if the window fogging is related more to humidity than colder temperatures.