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Old 02-04-2011, 09:46 PM   #1 (permalink)
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Date registered: Jan 2007
Vehicle: 1998 SLK 230
Location: Melbourne, AU
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coolant change SLK230 - drain radiator & engine block

took some pics to show people who are not sure where the drain points are of the slk230. i dont think anyone here actualy drains the engine block - a fair bit of coolant is in there... if your under the car you might as well.

first pic is the radiator drain point fairly easy to find and easy to get too... now to the engine block drain point. this is located on the side with the exhaust manifold look up where the steering is and you will see the nipple.

now i dont know how WIS recons you can use a box wrench in there but theres hardly any room and im paranoid stripping the bolt. i used a 19mm socket + universal joint extension on a ratchet. go nice and slow as coolant will drip and then gush out - highly recommended you do this when the car/coolant is cold for safety.

if you have your car on jack stands, jack up both front and rear to keep it level when draining.

you can flush the system with clean water until clean water comes out of the drain points. close them up and fill system with 50/50 anti freeze & water mix. use only MB anti freeze or valvoline/zerex g0-5
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coolant change SLK230 - drain radiator & engine block-cool1.jpg   coolant change SLK230 - drain radiator & engine block-cool2.jpg   coolant change SLK230 - drain radiator & engine block-cool3.jpg  
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Old 02-05-2011, 12:07 PM   #2 (permalink)
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Date registered: Mar 2006
Vehicle: 2010 C200cgi W203/SLK230/C180/230E/280SE
Location: Sydney Australia
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Tried the drain on the block first time and it was so stiff that I gave it away and resolved just to take extra care when flushing

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Old 02-05-2011, 02:19 PM   #3 (permalink)
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Date registered: Sep 2008
Vehicle: 2003 SLK230 USA model, Auto Transmission, Stock, Firemist Red
Location: Southeast USA
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Excellent write-up with instructional pictures. I have used engine drain plugs especially when pulling the head(s).

The way I do a coolant changes is:
Drain cold coolant through radiator drain plug.
Fill coolant system with garden hose water several times as water drains out.
Start engine with heater on, then keep garden hose running through coolant filler cap hole for a couple of minutes.
When coolant drains as clear water, turn off engine.
After total drain, install radiator drain plug/cock.
Fill with a couple of gallons or so of distilled water.
Run engine for a few minutes.
Drain distilled water from radiator drain cock.
Install drain plug.
Fill 50 % of system with appropriate radiator fluid.
Top off with distilled water.
2003 SLK230 USA model
Automatic Transmission
No Alterations/Stock
Southeast, USA
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Old 02-05-2011, 07:49 PM   #4 (permalink)
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Vehicle: 2001 SLK 320(178K Miles), 2002 E320 Special Edition(156K Miles)
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I always do this with the engine warm so that the thermostat is also open for better drainage. Also ensure that the heater control are set to maximum temperature so that the duo valves are open for draining from the heater core. Now I do have a different engine (320) and on mine I can remove the drain plug and no water will flow out as long as I keep the cap on the overflow bottle screwed on. I then position my container, open the cap on the overflow tank and get a fast outflow. To ensure the overflow container empty completely, I blow into the tank.

Also, I park with the rear slightly higher than the front, maybe 1 to 2 inches. On my last coolant change, I measure the amount drained at 10 quarts - out of a system total of 11 quarts. For that reason I did not bother with the drain-cocks on the engine, but just filled it with distilled water, warmed it up, drained and repeated.

Also, remember to re-check the coolant level over the days following. It takes a couple of days to get all the air out of the system. Remember to use the heater so that any air there is forced out as well.

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Old 02-12-2011, 01:03 AM   #5 (permalink)
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here is an article about mb coolant... interesting read.
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File Type: pdf antifreeze_article.pdf (1.68 MB, 768 views)
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Old 07-26-2011, 07:15 AM   #6 (permalink)
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bump.. ill be swappin my radiator out when i return. Helpful post.

I suppose ill just be draining the radiator, then ill be removing it and the fan to swap
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