SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: Radiator trouble

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Old Apr 17, 2019 | 02:33 AM
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2011 SL550R
Radiator trouble

Need some advice....need to flush the cooling system, ( oil got in the coolant, due failed oil cooler seals, I think, so replaced those, all went well). First I tried to remove the rad hose at the bottom of the rad, passenger side, no luck, doesn’t want to budge, then I started to open the petcock, and it broke, after opening just enough to start a slow leak.. I will attempt to drill out the remainder of the petcock tomorrow, and replace it. I would really prefer to get the lower rad hose off so I can drain large quantities quickly, the system is badly contaminated.
I brought this car back from Dubai, where it baked in the sun for 15 years. Any original plastic and rubber is extremely fragile.
Any thoughts greatly appreciated!
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