Today I took my 300SE on a Mercedes Club Pop up drive. The Pop up drives are short notice mid-week drives. I normally take the other cars to club events, but the 300SE had not been on a decent run for a while and the weather was terrible. The drive was down through the Royal National park to Mt Kembla, Mt Kiera and then...
A week or so ago, I diagnosed that the likely cause of my non functional A/C in the 300SE was the W126 Klima relay. The second generation W126 went to a Klima relay to control the A/C compressor. The W126 Klima relay is more of a control unit than a simple relay. It has multiple inputs that determine if the A/C compressor should not...
There is an old saying that deaths come in threes. I’ve not had any deaths in the family, but I had the A/C dead in three cars at the same time. The easiest was the A/C in my 450SLC that just needed a re-gas. The W126 A/C has been more problematic. Just as I got the system in my 560SEC mostly finished, the A/C...
Today I changed the Distributor cap and rotor in my 1986 300SE. I bought the new cap and rotor about two years ago but only just got around to changing it. Unlike on the earlier engines, the M103 distributor cap is a fiddly job. Instead of sticking upwards, it comes out sideways as it attaches to the camshaft. I find that whenever I buy...
Today I did an engine and transmission oil change on the 300SE. I don’t normally post basic maintenance to this website as it really isn’t that interesting. In this case, I used to tips I learned form MercedesSource videos that really sped up the job. MercedesSource are an online parts vendor, who also make some useful special tools. The owner, Kent, runs a...
A common feature of Mercedes cars from the mid 70s through the mid 2000s is the self-leveling rear suspension. This system is standard on the wagons, but was commonly specified on the higher end sedans too. Mercedes-Benz Australia was particularly keen on the system fitting it to coupes and even mid size saloons. The system ensures that even with a heavy load in the...
A few months ago I replaced the under bonnet insulation pad on my 560SEC. This job also needed doing on the 300SE. I purchased both pads at the same time, and finally got a chance to do the second one today. Note, if you’re looking for more information on forums, American sites will refer to this as a hood pad. There are youtube...
At least in Australia, by far the best month of the year to buy tyres is June. Both the tyre retailers and manufacturers offer attractive end of financial year sales. Most people don’t realize, but tread wear is not the only reason to replace tyres. As the rubber ages, it hardens. Once the tyres harden the handling, particularly in the wet is compromised....
Back in early 2017 I fixed my broken odometer. The 300SE odometer repair was successful, but there were two things I needed to follow up on. The odometer was reading 10% low. I could hear the gears, especially in cold weather. In addition, some time after I repaired the odometer, one of the bulbs that illuminates the instrument cluster at night failed. The fix...
The motor mounts were changed on the 300SE around six months ago, but there was not time to do the Transmission mount. It was obvious it would need doing from the condition of the motor mounts. In addition, I was feeling some vibration from the drivetrain at various times. changing the W126 transmission mount is generally a simple affair. The transmission is jacked up...
The saga of my non functional A/C is now over. The 300SE is blowing cold air. It would want to after all the parts I had to change to get this far. The final piece of the puzzle was the Klima relay. This relay controls the engagement of the compressor and had burned out when the clutch shorted. I ended up buying a rebuilt...
My fight with the W126 Air Conditioning system is almost over. When I purchased the car, the A/C worked rather well. After the water pump gave out, it looks like it shorted out the compressor clutch. Changing out the clutch is not much different to changing out the whole compressor, so I sourced a new compressor and receiver/drier. This was rather irritating as working...
My story of fixing the W126 climate control can be summed up by: If everything points to a problem with an expensive part, don’t waste your time trying to replace the cheaper parts around it in a futile hope it will solve the problem! After trying a used Climate Control Unit, new fan resistor etc, I finally bit the bullet and bought a rebuilt...
I’ve been fighting with the W126 Climate Control system for the last few months – and it’s been winning. When I purchased the car in November last year, it was a very hot day and the A/C worked great. It had a new radiator, so I took the evidence of leaking coolant to be history rather than a current problem. Turned out the...
The 300SE has been suffering from poor hot starts. It required a lot of cranking before it fired. On a K-Jet car, this is normally caused by a faulty fuel accumulator. From what I understand it’s the job of the fuel accumulator to hold fuel pressure after the car is switched off. I also planned to change the fuel filter as I didn’t know...
Recently on the 300SE I had to make a decision if I would fix the head gasket or junk the car. To do the repair right was going to cost pretty much what I paid for the car. I had also spent pretty decent money doing the water pump only a few months before. To add to that I probably had...
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