Mercedes-Benz C320 Questions

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Had the car 2 months,drove like a dream at first,then chaos,changed the shifter,changed the conductor plate,fluid,filter,fuses,and now even after reset goes into limp mode within minutes and is all over the place.No hard shifts just random erratic un drivable shifting.
I have a small leak amd can't figure out how to get behind the engine and firewal.
how much my cost if i want to change
My heat blowing on one side an on feet. Can you give me a lead way to help me out? Please
The key turns but nothing happens. Every other electrical gadget work fine.(lights, windows, etc) mechanic said it was the starter, but it was working fine no grinding , spining or clicking sound was ever hurd. This all. Happens after getting a jump because the lights were left on.
It seems like a transmission issue but I'm not familiar with this car, can anyone shed some light on this issue? It just started but no codes have shown on the screen?
There is a clicking noise right behind the drivers headlight if that helps. Any ideas what could be draining the battery?
The steering wheel locks while driving and jerks the vehicle off the road and the steering wheel pulsates back and forth. The brakes seem to be unresponsive during these episodes as well.
Me car switches from stick to automatic there is a button by the gear shift I think it's called the Str that button is not working properly when I drive it it stays in first and second and will not go 3rd 4th or 5th gear after driving it for an hour the car will not move in any gear if I let the car sit For a couple hours it will continue to work again I took it to a shop to get fixed and they're just taking my money not fixing my problem can anybody help
fan comes on when ignition is on, stops when ignition is turned off
Drove through deep mud. Car refused to leave gear 1. Have tried to remove it from emergency mode. First, will struggle to change but remains settled in gear 1. What do I do?
Indicators meaning gas, thermostat, and speed,
gnal sensor on hatch rail or in the lock? neither?
My c320 is usually loud, but when ac starts it gets louder. Now I see moisture/water leaking from the reserve and refrigerants pressure/temp sensor from the hi side. What should my concerns be and how do I repair this?
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