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2007 Mercedes-Benz S550 Questions

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Problem is intermittent. I installed a new battery afterwards and problems are the same. Sometimes everything works, then none of them work. Windshield wipers and turn signals also don't work.
my radiator fan run high all the time when I turn on my a/c. It sounds like jet plane taking off and I want know if this is normal. It also runs high when I turn on the heater. Any suggestions. I have no codes
I noticed today by left rear wheel undercarriage soaked in fuel.
I went to the shop and they said the diagnosis machine said my amp is bad? Could it be the wires connected to it? Before I spend a lot of money buying a new one is there a cheaper option?
I recently changed the radiator and to remove the radiator you had to remove the attached condenser. the condenser freon had to be let out so it needed to be recharged. during recharging the AC off was hit to test out the heat. And now when i press AC on it will not come on.
Dealer says needs new engine. How probable is workmanship error in disassembling and replacing balance shaft in causing this problem?
I need to know how to replace a front Fran Kase valve leak
Trying to determine if problems are related to year
When I start the car the command center comes on. There's a ticking sound coming from the steering wheel area, the radio goes in and out for a while the says "device not Active". Anyone else with this issue, and is it a simple fix?
To red marks then it it goes away then it shows Battery
brake light replacement
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