How It Works - Mercedes-Benz Automatic Climate Control System II Installation Manual And General Information

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How it Works

The purpose of the Mercedes Automatic Climate Control II system is for the car to
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regulate the fan speed and heater valve positions to maximize the passenger's comfort,
based on the inputs from the thumbwheel. In the original design, the a/c compressor is
constantly running and is mixed with varying levels of heat to reach the desired
temperature in the cabin. The amplifier-servo setup receives a certain resistance value
based on the car's three-sensor chain, and then uses that information to determine
whether it is in heating or cooling mode, and the optimal fan speed to balance the desired
temperature with the actual temperature. Although the original design sounds fantastic in
theory, the servo and amplifier are poorly designed parts purchased from Chrysler, and
simply cannot stand the test of time.
-My modern update kit easily integrates into the existing system to maintain the original
controls, and provide OEM function. The central control unit you are about to install
takes the job of both the amplifier and the servo. It uses a modern electronics system to
analyze that same sensor chain, and make real-time calculations to balance the
temperature and fan speed. The central control unit is made up of three solenoid motors
that are able to open and close vents inside the car and the heater valve based on inputs
from the user, just as the original system did. These solenoid motors are designed for
medical-instruments and should last many, many more years.
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