Why does my air only work on 4?

Why does my air only work on 4?

When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds, so the fan runs slower.

Why is my AC only blowing on high?

When a resistor fails, the fan will often run only at higher speeds or the highest speed, no matter what fan speed is selected. If little air is coming through the vents (hot or cold), then it could be because the blower motor for the fan or a switch or resistor that controls fan speed isn’t working.

Why is my AC barely blowing air?

Problems like a fan clogged with dirt, a dead motor, a loose fan belt or a stuck wheel can all cause your blower to not work properly. These problems can keep the blower fan from blowing enough air out of your vents to keep you cool. Your evaporator coil needs air to blow over it to complete your AC’s cooling process.

Why does my AC only work when I’m driving?

This is because it is not able to regulate the refrigerant needed to cool down the air. You may notice the car being most affected when stopped, as the engine is not working as hard, and there is no airflow from driving down the highway.

What happens when you set your AC fan to auto?

When your fan is set to AUTO on your thermostat, it will only run when the cooling component of your AC is running (when your AC system has conditioned air to blow throughout your home). However, if your fan is set to ON instead of AUTO, it will continuously blow, regardless of whether the cooling component of your AC is on or not.

How can you tell if your AC switch is failing?

Lack of cooling. If you begin to notice that the AC system is not blowing as cold as it used to, then that may be a sign that the switch has failed, or is beginning to fail. If the switch is not operating correctly, the AC system will not be pressurized correctly and will not work as efficiently in cooling the air.

Why does my air conditioner keep blowing hot air?

The cause could be a dirty evaporator coil caused by a dirty air filter. This keeps your air conditioner from properly cooling your home. You can change the filter, but you’ll need a professional to clean the evaporator coil. Walk outside and look at your air conditioner’s outside condenser unit.

Why does my AC stay on when I turn it off?

So, if you turn your AC “off” at your thermostat, that command isn’t registering with the fan or cooling system, causing your AC to stay on when you’ve told it to shut off. As with many of the fixes above, if your system is short-circuiting, you’ll want to contact an HVAC tech to fix it.