1995 Mercedes Benz E 300 Workshop Service & Repair Manual

Common Questions & Answers for Your 1995 Mercedes-Benz E 300 Diesel (W124)

• My 1995 Mercedes-Benz E 300 Diesel is experiencing intermittent electrical issues; could it be related to the wiring harness?

  Yes, that's a very common concern for your specific model and year. Mercedes-Benz used biodegradable wiring harnesses during that era, and the insulation often deteriorates over time. This can lead to all sorts of unpredictable electrical problems, even if they seem minor at first. It’s usually best to have a qualified mechanic inspect your engine wiring harness for signs of cracking or crumbling insulation. Replacement is often the most reliable long-term solution to prevent more serious electrical faults down the line.

• Why is my 1995 E 300 Diesel difficult to start, especially when it's cold outside?

  Hard starting, particularly in colder weather, is a common complaint for these E 300 Diesels, and glow plugs are often the main suspect. These plugs heat the combustion chambers to help with ignition. First, check if your glow plug indicator light on the dash is working correctly during a cold start. If it's not, or if your engine just cranks and cranks, you might have one or more faulty glow plugs, or perhaps even an issue with the glow plug relay. Having them tested is a good first step to narrow down the problem. Sometimes they just wear out, you know?

• I'm noticing a diesel fuel smell around my 1995 E 300 Diesel's engine bay; what should I check first?

  A diesel smell usually points to a fuel leak, and there are a few usual suspects on your OM606 engine. I'd definitely start by checking the fuel lines, especially the clear plastic ones around the fuel filter and the high-pressure pump – look for any discoloration or visible wetness. Also, don't forget those small rubber injector bleed-off (return) lines; they tend to get brittle and leak with age, giving off that distinct diesel scent. It's important to address these quickly to avoid potential fire hazards and keep your system running cleanly.

• The air conditioning in my 1995 Mercedes E 300 Diesel isn't blowing cold; what's usually the main culprit for this and is it a big fix?

  Oh, the AC evaporator is often the culprit for no cold air in these older E-Class models. It's a common point of failure. Unfortunately, yes, it can be quite a significant repair. To get to the evaporator, the entire dashboard usually needs to be removed, which is a very labor-intensive job. It's not a quick fix you can just tackle in an afternoon. Getting a diagnosis from a specialist is key to confirming if the evaporator is indeed the problem before you commit to such an extensive repair.

• I hear a clunking noise from the rear of my E 300 Diesel, and my tires seem to be wearing unevenly; what might be the cause?

  That clunking noise and uneven tire wear can definitely point to worn out components in your rear suspension. These cars have a multi-link rear setup, and over time, the rubber bushings in the control arms and links just degrade. If you hear clunking when shifting into gear or accelerating, it could also be worn rubber differential mounts. Uneven tire wear, especially the rear wheels leaning inward at the top, suggests the lower control arm bushings are likely cracked. Getting these inspected and replaced will really improve the ride and handling.