The first general automatic climate control was introduced in 1977 in the U.S. market. The system was installed on the 1977 to 1981 W123, 280CE, 300D, 300CD and 300TD (except 1981), the 1977 to 1980 W116 280SE, 280SEL, 300SD, 450SE, and 450SEL included the 6.9, and the 1977 to 1981 380SL, 380SLC, 450SL and 450SLC. If you have one of these cars you are going to have to learn how to deal with this system. Most mechanics today will not be of much help to you. If you want the heat to come on when it should and go off when you want it to - this video series could save you a lot of money and headache.
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Product Details
Only the heating system is covered in this two-part video series. Air conditioning issues and troubleshooting are not covered. Using a 1979 W116 300SD and 1980 300TD wagon Kent will walk you through the basics of the system and how it works. Troubleshooting and repair of the system will be covered in Part 2.
The specifics covered in Part 1 are:
- How to recognize if you have this automatic climate control system
- Where the key components are located
- What each one is called
- Differences in mounting the switch panel in the W123 and W116
- Overview of removing the switch panel ( not detailed )
- Details on getting to the servo amplifier
- Removing the glove box liner
- W116 and W107 Servo location
- W123 servo location
- Wires and hoses to inspect
- Function of each key component explained up close on the bench
- Importance of a healthy vacuum system - this is key!
- Temperature sensor issues
- Conclusion
- What will be covered in part 2.
PLEASE NOTE WHAT IS NOT COVERED: This is NOT an advanced diagnostic video for the hardcore mechanic. Kent does not expect you to open up and repair some of these components so this is not covered. Advanced electoral and vacuum system troubleshooting is not covered. Also, step by step instructions on removing the switch panel and the servo is not included. Only general information is covered along with challenges to inspect. Servos are straightforward and easy to remove. You just have to remove a lot of hoses and wires. The switch panel is more difficult to remove in the W123 because you have to remove the center console piece over the trans tunnel (between the seats)
Total Run Time: 27:21
How to view this on-demand video:
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Important note: This video manual may or may not include all the information you will need to troubleshoot and/or repair your specific problem/s. Please read the full description carefully to determine if this video is applicable to your year and model and contains the information you are looking for. If not, please refer back to our "Solutions Finder" and enter your chassis number and the specific problem you are having to see if we offer a solution.
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1977 to 1981 107 116 123 Chassis Climate Control Servo Bypass Conversion Kit
APPLIES TO: The first general automatic climate control was introduced in 1977 in the U.S. market.
Early Climate Control System Part 2: System Troubleshooting and Repairing - On Demand Video
In part 1 Kent covered the key components, where they are located and what they do. If you are not familiar with this system we recommend you watch part 1 first.
1977 to 1981 ACC II Climate Control Servo Replacement - Modern Electronic Upgrade
For US Models 116, 107, and 123 from 1977 to 1981 with Automatic Climate Control (Vertical Push Button Panel). New for 2023. Easy installation and excellent temperature regulation!