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I just bought a 2005 SV211 with the ZR6 engine. I don’t know when the coolant in the closed system was last changed by the previous owner so I thought I would change it out as part of my winterization. The PCM manual for the engine says to 1)remove drain plug on heat exchanger 2)remove hose from circulating pump 3) remove 2 drain plugs on either side of engine block. My problem is I don’t see any drain plugs on the block. Does anyone know where they are located? And how do you access the hose in the very back of the boat? Do you just let the coolant run into the bilge and out the drain hole? Looks like a PITA to do! Also, my boat has a single point drain option for draining the raw water; I can see it back there but I’ll be ****ed if I can get to it! Anyone have any tricks to getting to the drain bolt? Thanks!
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I'm wanting to do the same thing for my 2007 ZR6. Disappointing that no one has responded -
Answer to my own questions:
I still can’t find the drains for the antifreeze so I just removed coolant from reservoir tank and replaced it with 50/50 mixture of Dex-Cool.
The single point drain can be accessed by laying down in the starboard locker (super fun!)Comment
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