If your air conditioner works on high, it is a very specific issue. It can mean that there is a problem with the blower motor, the control board, or the thermostat. However, we still do a full diagnostic check-up to ensure that all of the switches, wiring, and fuses could not be causing the same issue.
Why does my AC only work on Max?
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.Jan 17, 2016
How do you know if a fan resistor is bad?
- Blower motor stuck on one speed. ...
- Blower motor does not work on certain settings. ...
- No air from the vehicle's vents.
What does a bad blower motor resistor look like?
Problems with a blower motor resistor are common in many cars. The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn't work at low speeds. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely.Aug 1, 2021
Why does my car AC only get cold when I accelerate?
A Failing Expansion Valve If your A/C flip-flops from hot to cold and back again, your expansion valve could be failing. ... If the valve is blocked, the refrigerant flow could be restricted or could be too unrestricted. A slight restriction of refrigerant flow can cause that mechanical part/hardware to get very cold.
What controls the speed of the AC in a car?
The speeds are controlled by a resistor or a computer control module activated by the blower fan switch. When the AC fan is not working it's usually caused by some sort of fault in the blower motor or resistor.
How do I know if my blower motor resistor is bad?
- Only One Speed From Blower Motor. One of the most common symptoms of trouble with the blower motor resistor is when the fan gets stuck in one setting. ...
- Various Airflow Settings Not Working. ...
- No Air Coming From Vents.
How do I make my car AC more airflow?
If you shut the AC vents that go to the passenger side, you will get MORE AIRFLOW to the ac vents that are on the drivers side. This will increase and double the airflow to the drivers side. 2 – Park your car under some shade or use a window sun blocker.Aug 6, 2015