The Furnace fan is used to assist the AC in doing its job It is not heating at all just air distribution.
The ac unit compressor will run when it is in defroster mode and heat setting is on.
yes
if the rear ac is working then you probably have a damper door that is inoperative. this is in the heater/evaporator box. so if it isn't working then you will be heating and cooling at the same time out of the heater box.
Only when the AC is on.
The squeal when you turn on the AC or heater is a loose fan belt. It may be cracked and need replaced, or it may just need tightened.
Yes, the ac will run in the defrost position to dry the windshield.
push the AC and heater buttons in at the same time and hold for 6 seconds
The service port nearest the "receiver/dryer" is the low pressure port. That's where you put the refrigerant.
Why does your ac and heater fan turn off and on
Of course it affects the air conditioning,,,it also affects the heater. Any time u have a restricted air flow it affects how heater and air conditioning works, for the worse. Engineers have designed the heater/ac system to run on clean air, so therefore your heater/ac systems work faster and better with a clean filter. Not to mention your own physical health by breathing clean air.
Yes, it will run when in defrost or mix.
how do you replace ac heater knob in a 05 accent