Where is the block drain plug? - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 03-05-2017
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Where is the block drain plug?

In the middle of changing the coolant in my SLK320. Only drained from the radiator drain plug so far and I'm 2 to 3 quarts short of the system capacity. I'm guessing I better find and drain from the block drain plug too. I would prefer not to disturb any of the hoses if I don't have to, but I will disconnect the lower hose if I absolutely have to. Before I do that, can someone tell me exactly where the block drain plug is and what kind of a bolt it is? A photo would be fantastic. I found one reverse or external torx bolt on the passenger side (right) that might be a candidate, but I didn't want to mess with it until I was sure.

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#2 Old 03-05-2017
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230 similar Len?

Figure 8?

Mercedes-Benz SLK 230 Coolant Flush and Replacement | 1998-2004 | Pelican Parts DIY Maintenance Article
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#3 Old 03-05-2017
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Thanks Jeff. Have to look for something like that on mine. Haven't seen it yet. Will take a look later.

Len
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The EPC shows two drain screws, one on each side I assume. I haven't found either one yet.

Len
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#5 Old 03-06-2017
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On my 230 it was higher up than I expected. Just below the level of a core plug if that helps.

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#6 Old 03-06-2017
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Well, I gave up - never did find the block drain(s). So I just flushed the system twice with distilled water, filled it up with the Mercedes coolant 50/50 with distilled water and called it a day. The old coolant was the original 15 year coolant and it looked very, very clean and clear.
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2003 SLK320 40,000 miles - now lives in Tucson with my daughter
1959 220S Cabriolet - sold - now lives in Malta
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1999 E300D 215,000 miles
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