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Old 04-29-2001, 04:59 PM
benne300
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My 300E has been acting weird latley. Every once in a while it will not start. this normally happens when I stop somewhere for a few minutes. When it first did it I let the car sit overnight and it fired right up. The second time it would not start, I removed the leads to the coolant sensor and inserted a wire between them. the car started right up. I figured I had a bad coolant sensor so I purchased another frm the local MB Dealer. THe car did fine for a couple of weeks and then began to not start as before. I have learned to short the 2 terminals when ever this happens and the car starts right away. (Not Stranded) Has anyone had anything similar happen. I was wondering if the overvoltage protection relay could cause these symptoms. I can not believe the coolant sensor has gon bad that quickly. Any help greatly appreciated

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Old 04-29-2001, 06:14 PM
David C Klasse's Avatar
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
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It must be the Overprotection Voltage Relay. I would buy a new one. It solved my problem. You should do a search if you haven't already. It is the cause 95% of the time. You can get them here on Partsshop for cheaper than anywhere else! Good luck.
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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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