What is high fan on air conditioner?
On high temperature low humidity days running the fan at a higher speed will allow the air to cool down faster and reduces the air conditioner’s ability to dehumidify.
Why is my AC heater fan not working?
This sounds more like a problem with high speed fan relay. On the low speeds, the fan relay routes the voltage thru the resistor block. When you switch to high fan speed, the relay switches over to supply full voltage from the battery to the fan motor.
Why does my fan not work in high setting?
High (4), usually a seperate circuit that by passes the resistor and has a relay for higher current flow required in the high setting The most common cause of two or more speeds not working is the resistor, because if resistor two burns out it will affect speeds 1 and 2 but not 3 and 4.
Why does my heater not work on high speed?
Heater blower motor will not work on high speed? I have replaced the black bosch relay behind the glovebox, the blower resistor and the blower motor and still cannot get the blower to work on high. I remember in older model years of gmc’s and chevys that their was a high speed blower relay that caused this issue.
How do you turn on a high speed heater fan?
Now pull the zip tie tight and cut the long end off with side cutters. Now reconnect your battery and turn your ignition switch back on and fan speed switch on high. The fan should be blowing on high, now wiggle the connector one more time the fan should stay on without interruption.
Why does my air conditioner / heater fan only work?
Our air/heater fan only blows air when it is set on high. It makes a hooting noise when it first starts like maybe there is something in the way. I have replaced the blower fan relay switch but that had no effect. These were all excellent. I had to replace both the resistor pack and the blower fan motor.
Heater blower motor will not work on high speed? I have replaced the black bosch relay behind the glovebox, the blower resistor and the blower motor and still cannot get the blower to work on high. I remember in older model years of gmc’s and chevys that their was a high speed blower relay that caused this issue.
Now pull the zip tie tight and cut the long end off with side cutters. Now reconnect your battery and turn your ignition switch back on and fan speed switch on high. The fan should be blowing on high, now wiggle the connector one more time the fan should stay on without interruption.
Why does the fan only run on the highest setting?
Most commonly the fan will only run on the highest setting. This is a well documented problem, and is caused by a failing blower motor resistor. Correcting the problem is straight forward, and requires replacement of the small resistor.