BenzWorld Junior Member
Date registered: Jul 2012
Vehicle: 1984 500 sec
Location: Lexington KY
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1984 500 SEC overheating problem
This is my second foray into the Mercedes Benz world (the first one ended badly). I recently acquired a 1984 500 SEC (grey market) for a nice price (a little over $1000). It's been out of service a few years, but I have it running now.
Numerous problems exist with the car. However, this one has me a bit concerned. When I start the car, it runs fine and drives fine... for about five minutes. Then the temp shoots up and I turn off the car. Now, when I release the radiator cap the fluid shoots into the tank. I keep the cap on to make sure it does not splash everywhere. I reseal it when the fluid completely fills the tank so I don't dump coolant all over the ground. After a minute, I open the cap again, the fluid shoots back into the radiator, and I start up the car and the temp is normal. I can then drive for hours like this with the temperature normal (between 80 - 90 c). If I let the car cool down, then I have to repeat the process. I've replaced the radiator cap (autozone one, the Benz one is already ordered). Yet, I still seem to have this problem.
Also, when I start the car, it has a hard time getting started for the first time when it's cold. I still have to do the plugs, wires, rotor cap and such. I figure that this will solve that problem.