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  #1  
Old 06-20-2003, 05:57 PM
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Join Date: Jun 2003
Location: San Francisco, CA
Posts: 14
Where is the engine block drain plug on the W202?

Iím planning to drain the entire coolant system in the radiator and the engine block in my 1999 C230 (W202 Chassis). However, I'm unable to locate the engine block drain and the bleed hole. If any body can shed a light on this subject I would be appreciated.

Thanks in advance
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Old 06-20-2003, 09:05 PM
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Join Date: Feb 2002
Location: east coast
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Did my `98 C230 about 10 months back, engine block drain plug is on the passenger side may be between two freeze plugs - 40mmm round depressions- in the block. center to forward on the block horizontal and about 1/3rd up vertically. No need to pull drain plug all the way out

Have some tubing - my guess is about 12mm inner diameter to stuff over the radiator drain plug to guide fluid into bucket instead of having it drip onto cross-member.

Use only Mercedes Benz radiator fluid and distilled water, I premixed my coolant and water with redline Water Wetter before filling in overflow tank.

When fluid is thought to be refilled run engine with radiator cap off for five or ten minutes to rid of air and then fill to between markings on overflow tank.

If this is the second coolant change no need to worry about flushing, if it is your first coolant change get an opinion from the list on flushing. No need to remove thermostat if not flushing for coolant change.

No bleed hole, radiator cap is high enough for this.
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Old 06-24-2003, 05:18 PM
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Join Date: Jun 2003
Location: San Francisco, CA
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Thank you for your response, Iím just a new kid in the block and this is my first do it yourself project. I tried to follow your direction and located the engine block drain plug last night and I still cannot find it. I assume when I stand in front of engine, the plug location will be on the left hand side? Is it on the front or on the left side of the engine? If anyone can give me more detail or post some picture and indicate the location. I would really be appreciated.
Thanks
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Old 06-24-2003, 08:56 PM
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Join Date: Feb 2002
Location: east coast
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I have a pic. you can e-mail me at (interethan@earthlink.net) your e-mail address, and I will send a picture.

There is no bleed hole, the radiator cap does this function.

Notice that my car is non-supercharged, but most things should look the same.

Drain plug is under the intake manifold -passenger side- to the rear of the engine mount, about the third cylinder back. It looks like a bolt with a nut around it. the bolt is hollow. As you undo the nut the water begins to drain.

Also Haynes makes a manual for these 202 cars, it is a U.K non supercharged version, but it is just about all the help available. www.haynes.co.uk
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