Diagnose door lock problems on 1977 to 1985 240D 300D 300CD 300TD 280E 280CE. For all 123 chassis cars with vacuum door locks from 1977 to 1985. Now you can finally fix those pesky vacuum door locks yourself! Failure is almost always caused by vacuum leaks in the system.
This 28 page PDF manual with 55 photographs will take you step by step through the process of quickly finding and repairing those leaks. Starting at the firewall and working all the way to the trunk/deck of your car, I will show you how to isolate the problems even without having to take the door panels off.
To aid in trouble shooting you will need to acquire an inexpensive vacuum hand pump. Normal hand tools are the only other things you will need. For 1977 to 1980 cars I even have vacuum actuator repair kits available so you can replace any cracked diaphragms you may find.
PLEASE NOTE: as an added bonus I have included all the information contained in my 123 Door Maintenance Guide in the appendix of this manual (no need for you to purchase that separately). This will show you how to properly remove your door panels and do other related maintenance inside your doors while you are working on the vacuum door locks. There are even instructions on how to properly deactivate the automatic door locks if you should so choose.
How to view this on-demand Manual:
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Important note: This PDF may or may not contain all the information you will need to solve your specific problem. Please read the description carefully and make certain it applies to your particular Mercedes. If you are not certain please contact us first. Due to the nature PDF download manuals or instructions we can not issue a refund if you purchase in error or assume it contains information it does not. Please keep in mind that no follow-up technical support is implied or offered after purchase.