1994 Mercedes-Benz C220 Questions

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I noticed an adapter thats not hooked into anything so was wondering what part could be missing
car will not idle it stalls and the oil is a white milky color with a fuel smell
had a oil changed in the automatic gear box. reverses ok when cold but as soon as the car is warmed up, it won't reversed when I problem in putting into R gear though.
I have replaced the radiator and had flushed twice but the same result. The car is not overheating, there is no white smoke coming from tail pipe and my engine oil dip stick is clean. I have been told its not the trans cooler. The last mechanic said it might be coming from the timing cover and will need to be reseal but at the cost of $2400.00 but cant confirm it will solve my issue. The car is not worth that much although its in excellent condition. Could you please advise on what the issue might be? I don't think its the gasket.
Shop says not fuel vent. May be electrical. Low voltage???
Shifting appears normal for first and second gear, except it occurs somewhat faster than desired. But in going into third gear, engine revs up and transmission slips before engaging the gear. Third to fourth shift appears normal. Error Code P1700 is shown on diag read-out. What is our best solution to eliminate this ? The only way to avoid this when driving is to release the throttle pressure when second gear has shifted to allow third to "drop into place".
Coolant light intermittently comes on, added more coolant and water and drove for about 3 months when light came on again. Refilled but this time I notice slow water leakage. Car wouldn't start next day then started a few days later. Notice water leaks only after car is driven. Stopped driving it for now.
Blower motor was making a whistling noise and it has stopped working. Mechanic said I need to replace both the motor and the resister. He was able to by pass something and make the blower works and blow low heat. Why would I need a new blower if its still blower air? I can understand replacing the resister. Can you clarify for the blower motor?
the horn blows when i squeeze the stering wheel. the lights come on if I dont line the light switch up just right.
my mechanic have fixed this once he said it's something to do with flaps. but after 2 years it gave out again. my car has 185k miles paint is fading and i'm not sure if it's worth to fix the air conditioner for this car. The heat comes and goes it that not do it every time.
leaking from a hose
Sometimes they are on and then they will not work. Also I've noticed the lights going on and off in the car when I drive.
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