What happens when an AC control module fails?
When a module is beginning to fail, air may blow only out of certain vents or under certain settings. Since the AC control module is basically the control computer for the AC system, any problems with it will negatively affect the entire system.
How does Mercedes Benz air conditioner system work?
While the pictures on this article are of Mercedes Benz cars, this guide is written to apply to all makes and models. How the A/C System Works. A/C compressor not engaging.
How does the AC Control Module work in a car?
The AC control module is used to control and regulate all the functions of the AC system electronically. It reads data from the cabin and the outside of the vehicle and uses that information to regulate and adjust the AC system as needed to keep the cabin at the correct temperature.
How to troubleshoot your Mercedes medic air conditioner?
Turn the A/C ON. If you have an Economy button make sure that is off. Make sure fan is on HIGH, temperature selector is turned all the way to COLD, and that the A/C and recirculate light indicators are on. Set the temperature to cold, the lowest setting. Set the cooling fans on high on the climate control.
How do you replace an AC Control Module?
Support the AC control module while disconnecting the connectors. Take note where each connector goes and lay them in plain site. Now, the old AC control module should slide out and be able to be set aside. Step 4: Install the new AC control module. First take a look at the new AC control module, making sure it matches the one that was removed.
What causes an AC Control Module to fail?
The first step in this process will be to confirm that the AC control module is the source of the problem. The most common failures include inconsistently functioning AC system, or improper air distribution. AC control modules do fail over time as the vehicle ages. Step 2: Identify the AC control module location.
When do you need to change the a / C control unit?
Let me know if that link stops working. If the air conditioning in your car only blows out in one direction, such as the defrost, or at your feet, or head, and no matter what way you turn the knob it always stays at that one particular setting, you need to change the A/C Control Unit. (The potentiometer has gone bad.) This is an easy fix.
What does the AC Control Module do on a car?
The AC control module is the the brain of the whole system. This electronically controls the interior AC functions such as fan speed, temperature, and which vents the air comes from as well as controlling the AC compressor and mechanical system.
Where is the HVAC module on a car?
The HVAC control module is situated behind the glove box, it is remote from the dash controls. If you do have power and ground but the unit is still not working you will need to replace the HVAC module. helpful? If you need to check the power/ground at the HVAC control module.
Why does my AC not turn on after a battery swap?
Immediately afterward, the controls would only blow heat through the defrost setting, no matter what the dial was set to. Also, when I tried the AC the light on the button would just blink and never turn the AC on. Its a real pain in the butt that this happened just from a battery swap!!! I’ve never heard of that problem.
Where are the connectors on the a / C control panel?
It has 4 connectors. The Power/ground is in the 2nd connector. With the unit plugged in back probe using pin 8 as your ground, ignition on, check what you have on pins 8 and 9. You should have 12V, If you do then the A/C control module should be communicating.