Check your relays. Mercedes Benz has a complex set of relays usually located in the engine compartment. These relays share functionality, i.e. 1 relay controls a set of electronics. could be AC & speedo gauges, etc... If you drive a W124, its behind the battery, if W220, its in the upper left hand size of the bay seperated from the rest of the compartment covered with a black plastic cover with screws.
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no 4-3 or 3-2 downshift uncontrolled downshifts outside range of kickdown switch poor acceleration from stopped position parking pawl will not engage selector lever does not engage in r or p engine will not start in p or n position smoke in exhaust (fluid loss) fluid loss between torque converter & primary pump howling noise when changing gears (under full load) howling noise which increases as engine rpm increases 1st gear & reverse too loud 3rd gear too loud rattling noise at 1500 rpm in all positions except r light grinding noise in p & n positions rolling noises when driving in reverse vacuum control circuit Vacuum Control Valve (E300D & S350D) Vacuum Amplifier (E300D & S350D)
Most likely a head gasket leak between coolant channels and oil channels. Need a radiator pressure guage and pump to test holding pressure in coolant system. No oil/water heat exchangers on your car. Usually just a head gasket replacement.
First you have to remove the turn signal lamp. There is a plastic release tang that you push one way and pull the turn signal out.
Next you have to remove the filler panel below the headlight assy to gain access to the bottom bolt. 2 screws hold the filler in place. There is also a black plastic filler panel that is pinned to the headlight assy remove it. There are 3 or 4 bolts that hold the headlamp assy in place 2 on top 1 on bottom actually it might be 2 on the bottom. (old age memory loss LOL) remove the bolts and remove the headlamp assy. The lens is held in by plastic clips just pry up gently on the locking clips and remove the lens. I hope this helps. It fairly easy and you should be able to DIY.
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